Difference: CrystalUndulator (1 vs. 37)

Revision 372015-09-14 - TimBrooks

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Experimental design

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META FILEATTACHMENT attachment="figure_t9.png" attr="" comment="T9 experimental zone layout" date="1438181325" name="figure_t9.png" path="figure_t9.png" size="25515" user="brooks" version="1"
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Revision 362015-09-07 - TimBrooks

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What impact does the beam environment have pre- and post-crystal? Would a vacuum tube be feasible? Tim Looking at NA43/59 documentation

Resources

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Revision 352015-09-07 - TimBrooks

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Experimental design

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META FILEATTACHMENT attachment="CERN_proposal_-_Accelerating_Africa.pdf" attr="" comment="Project proposal" date="1434024424" name="CERN_proposal_-_Accelerating_Africa.pdf" path="CERN_proposal_-_Accelerating_Africa.pdf" size="143928" user="brooks" version="1"
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META FILEATTACHMENT attachment="AngleTracksYFocusDWC2.jpeg" attr="" comment="T9 tracks angle" date="1436095569" name="AngleTracksYFocusDWC2.jpeg" path="AngleTracksYFocusDWC2.jpeg" size="22668" user="jorgen" version="1"
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Revision 342015-09-03 - TimBrooks

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Resources

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-- TimBrooks - 2015-06-03

Revision 332015-08-31 - TimBrooks

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META FILEATTACHMENT attachment="AA_layout.png" attr="" comment="Proposed experimental layout" date="1434532478" name="AA_layout.png" path="AA_layout.png" size="72845" user="brooks" version="1"
META FILEATTACHMENT attachment="T9TracksX.pdf" attr="" comment="T9 tracks 2014" date="1436018153" name="T9TracksX.pdf" path="T9TracksX.pdf" size="27476" user="jorgen" version="1"
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Revision 322015-08-21 - TimBrooks

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Development

Date Action
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2015-08-20 Assembled goniometer in B4 office
 
2015-08-05 In contact with Ulrik Uggerhøj about goniometer at CERN
2015-07-10 Vidyo meeting with SimonHConnell and TimBrooks - discussed simulation results and planning
2015-07-01 Meeting with SergioBallestrero, MarkusJoos and TimBrooks - discussed status and plans moving forwards

Revision 312015-08-13 - TimBrooks

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Program

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Preliminary task list:
  • Empty run to calibrate detector,
 
  • Team intends to work first with positrons, then electrons. Would electrons be better since they are a larger fraction of the Negative beam than positrons in the negative beam?
  • Need identification of electrons/positrons.
  • Need to extrapolate particles into the crystals to identify hit/no hit events. We rely on DWC0 & DWC1 to provide hit position on crystal. If we can construct a very small scintillator, we can trigger on events with a likely traversal of the crystal.

Revision 302015-08-10 - TimBrooks

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Open issues

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Description Action by Status Date
Integration of Goniometer readback with DAQ chain Tim, Sergio Need information from Ulrik about goniometer model 2015-08-10
Understand requirements of Photon calorimeter - Team in Arhus and Mainz have BGO calorimeters, UJ has a NaI calo. Tim We may be able to use the Opal calorimenters for photon and beam calorimeters
Production of trigger scintillator Tim Checking active dimensions
The team proposes to test the crystal with both positrons and electrons Tim Estimate if T9 provides enough of the particles at the right energy and if inefficiencies in the particle identification could be a problem
Sergio mentioned that synchrotron radiation may cause a background that masks the x-rays from the crystal Tim, Sergio discuss this further
What impact does the beam environment have pre- and post-crystal? Would a vacuum tube be feasible? Tim Looking at NA43/59 documentation
>
>
Action Priority Due
Integration of Goniometer readback with DAQ chain
Need information from Ulrik about goniometer model
1 2015-08-19
Understand requirements of Photon calorimeter
Team in Arhus has a BGO calorimeter
1 2015-08-19
Production of trigger scintillator
Checking active dimensions
3
 

Closed issues

Description By Status
Simulation of crystal interaction Simon Have some data in attached PDF
We will need a magnet Tim, Lau, Henric We have use of the MNP17 magnet we can decide on location
Sergio pointed out that the crystals have to be carefully aligned with respect to the beam. Therefore we need a suitable mechanical support Markus, Simon UJ will provide Labview controlled goniometer
Added:
>
>
The team proposes to test the crystal with both positrons and electrons Tim Estimate if T9 provides enough of the particles at the right energy and if inefficiencies in the particle identification could be a problem
 
The team proposes different materials that could be used for growing the crystal. Do we have a preference? Tim, Sergio Simon states the team will likely have one Diamond undulator and one Si-Ge
Added:
>
>
Sergio mentioned that synchrotron radiation may cause a background that masks the x-rays from the crystal Tim, Sergio discuss this further
What impact does the beam environment have pre- and post-crystal? Would a vacuum tube be feasible? Tim Looking at NA43/59 documentation
 

Resources

Revision 292015-08-05 - TimBrooks

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Development

Date Action
Added:
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>
2015-08-05 In contact with Ulrik Uggerhøj about goniometer at CERN
 
2015-07-10 Vidyo meeting with SimonHConnell and TimBrooks - discussed simulation results and planning
2015-07-01 Meeting with SergioBallestrero, MarkusJoos and TimBrooks - discussed status and plans moving forwards
2015-06-24 Vidyo meeting with SimonHConnell, MarkusJoos and TimBrooks - discussed experimental requirements
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  • Ulrik Uggerhøj - Aarhus contact for Goniometer
 

Open issues

Changed:
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Description Action by Status
Simulation of crystal interaction Simon Have some data in attached PDF
Integration of Labview angle measurements with DAQ chain Tim, Sergio Need information from Simon about goniometer model
Shipping for goniometer, crystal, etc. Markus, Simon  
Understand requirements of Photon calorimeter - Team in Arhus and Mainz have BGO calorimeters, UJ has a NaI calo. Tim, Christoph Need information from simulations as to expected energy ranges
We may be able to use the Opal calorimenters for photon and beam calorimeters
The team proposes to test the crystal with both positrons and electrons. Tim Estimate if T9 provides enough of the particles at the right energy and if inefficiencies in the particle identification could be a problem
>
>
Description Action by Status Date
Integration of Goniometer readback with DAQ chain Tim, Sergio Need information from Ulrik about goniometer model 2015-08-10
Understand requirements of Photon calorimeter - Team in Arhus and Mainz have BGO calorimeters, UJ has a NaI calo. Tim We may be able to use the Opal calorimenters for photon and beam calorimeters
Production of trigger scintillator Tim Checking active dimensions
The team proposes to test the crystal with both positrons and electrons Tim Estimate if T9 provides enough of the particles at the right energy and if inefficiencies in the particle identification could be a problem
 
Sergio mentioned that synchrotron radiation may cause a background that masks the x-rays from the crystal Tim, Sergio discuss this further
What impact does the beam environment have pre- and post-crystal? Would a vacuum tube be feasible? Tim Looking at NA43/59 documentation

Closed issues

Description By Status
Added:
>
>
Simulation of crystal interaction Simon Have some data in attached PDF
 
We will need a magnet Tim, Lau, Henric We have use of the MNP17 magnet we can decide on location
Sergio pointed out that the crystals have to be carefully aligned with respect to the beam. Therefore we need a suitable mechanical support Markus, Simon UJ will provide Labview controlled goniometer
The team proposes different materials that could be used for growing the crystal. Do we have a preference? Tim, Sergio Simon states the team will likely have one Diamond undulator and one Si-Ge

Revision 282015-07-29 - TimBrooks

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Accelerating Africa Team

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Accelerating Africa Experiment

 
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Experimental design

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Revision 272015-07-15 - TimBrooks

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Development

Date Action
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Crystals

Likely to have one diamond crystal and one Silicon-Germanium crystal. Si-Ge crystals may be made much larger.
Changed:
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The estimated sizes are 4 x 4 mm for diamond and about 4 x 10 mm for Si-Ge. The intent is to produce a 600nm pitch C-C(B) undulator with at least four periods radiating between 0.4 - 2.0 GeV.
>
>
The estimated sizes are 4 x 4 mm for diamond and about 4 x 10 mm for Si-Ge. The intent is to produce a 600nm pitch C-C(B) undulator with at least four periods radiating between 0.06 - 1.12 GeV.

Element Six have confirmed they will manufacture an undulator to the above specification. Two other manufactures will produce undulators also.

 

Spectrometry

The MagneticField from the MNP17 magnet is $0.56\,\mathrm{T}$ over $0.52\,\mathrm{m}$. This should deflect a $10\,\mathrm{GeV}$ particle by $0.5^{\circ}$. Over $5\,\mathrm{m}$, that corresponds to a displacement of $47.7\,\mathrm{mm}$. This needs to be optimised to reject beam particles entering the calorimetry.
Line: 74 to 78
 

Calorimetry

Will use LeadGlassCalorimeter blocks the reject arm, after the spectrometry tracking. The front surfaces of the blocks are $10\times10\,\mathrm{cm}$. This may also be suitable for the Photon calorimeter. It may be possible to add an external (shaping) amplifier to increase the energy range.
Changed:
<
<
Need to investigate BGO Photon calorimeter from Aarhus group. Need sizing, power supply and readout requirements. The working range should cover 0.4 - 2 GeV.
>
>
Need to investigate BGO Photon calorimeter from Aarhus group. Need sizing, power supply and readout requirements. The working range should cover 0.06 - 1.12 GeV.
 

Trigger

Since the Crystal's acceptance will be small, require small trigger scintillators, or halo counter as a veto. Jorgen is skeptical of halo counters due to inefficiencies of the Scintillators. A single small trigger scintillator may be better for this role - need to investigate possibility of small scintillator blocks.

Revision 262015-07-10 - TimBrooks

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Development

Date Action
Added:
>
>
2015-07-10 Vidyo meeting with SimonHConnell and TimBrooks - discussed simulation results and planning
 
2015-07-01 Meeting with SergioBallestrero, MarkusJoos and TimBrooks - discussed status and plans moving forwards
2015-06-24 Vidyo meeting with SimonHConnell, MarkusJoos and TimBrooks - discussed experimental requirements
2015-06-16 Met with SergioBallestrero and SimonHConnell to discuss support for Team
Line: 100 to 101
 

Open issues

Description Action by Status
Changed:
<
<
Simulation of crystal interaction Contact Andrey Solovyov Waiting on progress from Simon
>
>
Simulation of crystal interaction Simon Have some data in attached PDF
 
Integration of Labview angle measurements with DAQ chain Tim, Sergio Need information from Simon about goniometer model
Shipping for goniometer, crystal, etc. Markus, Simon  
Changed:
<
<
Understand requirements of Photon calorimeter - Team in Arhus have BGO calorimeter Tim, Christoph Need information from simulations as to expected energy ranges
We may be able to use the Opal calorimenters for photon and beam calorimeters
>
>
Understand requirements of Photon calorimeter - Team in Arhus and Mainz have BGO calorimeters, UJ has a NaI calo. Tim, Christoph Need information from simulations as to expected energy ranges
We may be able to use the Opal calorimenters for photon and beam calorimeters
 
The team proposes to test the crystal with both positrons and electrons. Tim Estimate if T9 provides enough of the particles at the right energy and if inefficiencies in the particle identification could be a problem
Sergio mentioned that synchrotron radiation may cause a background that masks the x-rays from the crystal Tim, Sergio discuss this further
What impact does the beam environment have pre- and post-crystal? Would a vacuum tube be feasible? Tim Looking at NA43/59 documentation
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  -- TimBrooks - 2015-06-03
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META FILEATTACHMENT attachment="CERN_proposal_-_Accelerating_Africa.pdf" attr="" comment="Project proposal" date="1434024424" name="CERN_proposal_-_Accelerating_Africa.pdf" path="CERN_proposal_-_Accelerating_Africa.pdf" size="143928" user="brooks" version="1"
META FILEATTACHMENT attachment="AA_layout.png" attr="" comment="Proposed experimental layout" date="1434532478" name="AA_layout.png" path="AA_layout.png" size="72845" user="brooks" version="1"
META FILEATTACHMENT attachment="T9TracksX.pdf" attr="" comment="T9 tracks 2014" date="1436018153" name="T9TracksX.pdf" path="T9TracksX.pdf" size="27476" user="jorgen" version="1"
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Revision 252015-07-09 - TimBrooks

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Crystals

Likely to have one diamond crystal and one Silicon-Germanium crystal. Si-Ge crystals may be made much larger.
Changed:
<
<
The estimated sizes are 4 x 4 mm for diamond and about 4 x 10 mm for Si-Ge.
>
>
The estimated sizes are 4 x 4 mm for diamond and about 4 x 10 mm for Si-Ge. The intent is to produce a 600nm pitch C-C(B) undulator with at least four periods radiating between 0.4 - 2.0 GeV.
 

Spectrometry

The MagneticField from the MNP17 magnet is $0.56\,\mathrm{T}$ over $0.52\,\mathrm{m}$. This should deflect a $10\,\mathrm{GeV}$ particle by $0.5^{\circ}$. Over $5\,\mathrm{m}$, that corresponds to a displacement of $47.7\,\mathrm{mm}$. This needs to be optimised to reject beam particles entering the calorimetry.
Line: 71 to 71
 The DelayWireChambers have a linear acceptance of 80mm. Using MNP17 at full field, 0.5GeV particles would be deflected by 99mm, 30cm behind the magnet. 10 GeV particles would be deflected by 98mm 11 meters behind MNP17.

Calorimetry

Changed:
<
<
Will use LeadGlassCalorimeter blocks the reject arm, after the spectrometry tracking. The front surfaces of the blocks are $10\times10\,\mathrm{cm}$.
>
>
Will use LeadGlassCalorimeter blocks the reject arm, after the spectrometry tracking. The front surfaces of the blocks are $10\times10\,\mathrm{cm}$. This may also be suitable for the Photon calorimeter. It may be possible to add an external (shaping) amplifier to increase the energy range.
 
Changed:
<
<
Need to investigate BGO Photon calorimeter from Aarhus group. Need sizing, power supply and readout requirements. The LeadGlassCalorimeter can be a backup for the Photon calorimeter.
>
>
Need to investigate BGO Photon calorimeter from Aarhus group. Need sizing, power supply and readout requirements. The working range should cover 0.4 - 2 GeV.
 

Trigger

Since the Crystal's acceptance will be small, require small trigger scintillators, or halo counter as a veto. Jorgen is skeptical of halo counters due to inefficiencies of the Scintillators. A single small trigger scintillator may be better for this role - need to investigate possibility of small scintillator blocks.

Revision 242015-07-07 - JorgenPetersen

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Beam

An analysis has been done on DWC data from two runs in 2014, with beams focused on DWC0 and DWC2, resp. Events with three hits had tracks constructed using least squares fitting (Root, Minuit2). Below is shown some 2D graphs containing 100 tracks, the first ones with the beam focusing on DWC0, the second on DWC2. A beam spot size of about 4 cm * 4 cm is observed.
Changed:
<
<
It should be noted that the distributions are for events triggered by SC0 which means that the FULL beam profile is not shown. Actually, measurements of counts in the scintillator (SC2) from last year( see table 4.1 in the TR) show that there is a* large beam halo*, more than 20cm*20cm, most likely of muons. This should be taken into account by the Leo3G experiment.
>
>
It should be noted that the distributions are for events triggered by SC0 which means that the FULL beam profile is not shown. Actually, measurements of counts in the scintillator (SC2) from last year( see table 4.1 in the TR) show that there is a* large beam halo*, more than 20cm*20cm, most likely of muons. This should be taken into account by the Leo4G experiment.
 
Plots with high statistics showing the track distributions in X and Y for all three DWCs are seen in the attachments, for the run focusing on DWC0. As well as plots of the angular distributions in X and Y which show that the mean of the angles is around 5 mrad. By calculating the distance between fitted and measured points, the resolution is estimated to be about 1.5 mm.
As mentioned above, the experiment will use electrons and positrons that oscillate in the crystal to produce gamma rays.
Changed:
<
<
In the BL4S 2014 technical Report, measurements are shown of the rate of electrons in a beam of 4 GeV/c, see table 4.3. A rate of about .95 kHz was observed. Assuming a beam profile of 4cm*4cm, this implies about 60 Hz per 1cm*1cm. For the diamond (4*4 mm**2) this means about 10 Hz of electrons. For the Si-Ge crystal, about 20 Hz. The electron contents of the beam is strongly momentum dependent as shown in fig 2.2 of the TR.
>
>
In the BL4S 2014 technical Report, measurements are shown of the rate of electrons in a beam of 4 GeV/c, see table 4.3. A rate of about .95 kHz was observed. Assuming a beam profile of 4cm*4cm, this implies about 60 Hz per 1cm*1cm. For the diamond (4*4 mm**2) this means about 10 Hz of electrons. For the Si-Ge crystal, about 20 Hz. The electron contents of the beam is strongly momentum dependent as shown in fig 2.2 of the TR.
 
The code developed is a monitoring program that can read events online or from a file:
~public/BL4S_DAQ/DataFlow/ROSMonitor/src/DWCTracking.cc (give the repository path ...) This program can be used to analyse the DWC data and provide a "burst" event display.
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Added:
>
>

The rate of electrons/positrons can also be estimated from the T9 documentation. The figure on beam rates( Lau's presentation slide 13 or the office above Tim's desk ..) shows that the maximum rate of electrons at 4 GeV/c (with the collimators wide open) is about 10000 per burst. With a beam profile of 4*4 cm**2 that implies about 100 on 4*4 mm**2 per burst or 50 per second. This is a little higher than the estimate above probably because the collimators were not wide open last year(to be checked).
 

Particle Identification

The fixed Cerenkov counters allow to identify electrons and positrons. In principle, one Cerenkov counter is sufficient to identify the light particles.

Revision 232015-07-07 - JorgenPetersen

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Plots with high statistics showing the track distributions in X and Y for all three DWCs are seen in the attachments, for the run focusing on DWC0. As well as plots of the angular distributions in X and Y which show that the mean of the angles is around 5 mrad. By calculating the distance between fitted and measured points, the resolution is estimated to be about 1.5 mm.
As mentioned above, the experiment will use electrons and positrons that oscillate in the crystal to produce gamma rays.
Changed:
<
<
In the BL4S 2014 technical Report, measurements are shown of the rate of electrons in a beam of 4 GeV/c, see table 4.3. A rate of about .95 kHz was observed. Assuming a beam profile of 4cm*4cm, this implies about 160 Hz per 1cm*1cm. For the diamond (4*4 mm**2) this means about 25 Hz of electrons. For the Si-Ge crystal, about 60 Hz. The electron contents of the beam is strongly momentum dependent as shown in fig 2.2 of the TR.
>
>
In the BL4S 2014 technical Report, measurements are shown of the rate of electrons in a beam of 4 GeV/c, see table 4.3. A rate of about .95 kHz was observed. Assuming a beam profile of 4cm*4cm, this implies about 60 Hz per 1cm*1cm. For the diamond (4*4 mm**2) this means about 10 Hz of electrons. For the Si-Ge crystal, about 20 Hz. The electron contents of the beam is strongly momentum dependent as shown in fig 2.2 of the TR.
 
The code developed is a monitoring program that can read events online or from a file:
~public/BL4S_DAQ/DataFlow/ROSMonitor/src/DWCTracking.cc (give the repository path ...) This program can be used to analyse the DWC data and provide a "burst" event display.

Revision 222015-07-06 - TimBrooks

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<img src="https://twiki.cern.ch/twiki/pub/BL4S/CrystalUndulator/T9TracksYFocusDWC2.jpeg" width="500" height="500" align="right" alt=""
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Particle Identification

The fixed Cerenkov counters allow to identify electrons and positrons. In principle, one Cerenkov counter is sufficient to identify the light particles.
Line: 66 to 66
  Henric has the MNP17 magnet booked for the BL4S beam-time, and the SHIP emulsion test prior to it. The positioning of the magnet is not critical for the SHIP test, so we may decide its location.
Changed:
<
<
The DelayWireChambers have an acceptance of 100mm. Using MNP17 at full field, 0.5GeV particles would be deflected by 99mm, 30cm behind the magnet. 10 GeV particles would be deflected by 98mm 11 meters behind MNP17.
>
>
The DelayWireChambers have a linear acceptance of 80mm. Using MNP17 at full field, 0.5GeV particles would be deflected by 99mm, 30cm behind the magnet. 10 GeV particles would be deflected by 98mm 11 meters behind MNP17.
 

Calorimetry

Will use LeadGlassCalorimeter blocks the reject arm, after the spectrometry tracking. The front surfaces of the blocks are $10\times10\,\mathrm{cm}$.

Revision 212015-07-05 - JorgenPetersen

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Changed:
<
<
>
>
<img src="https://twiki.cern.ch/twiki/pub/BL4S/CrystalUndulator/T9TracksYFocusDWC2.jpeg" width="500" height="500" align="right" alt=""

Particle Identification

The fixed Cerenkov counters allow to identify electrons and positrons. In principle, one Cerenkov counter is sufficient to identify the light particles. Operating the Cerenkovs with air at 1 atm is probably OK, see tables referenced in the TR 2014.
The analogue signals as well is the discriminated signals should be recorded in a QDC and TDC.
 

Crystals

Likely to have one diamond crystal and one Silicon-Germanium crystal. Si-Ge crystals may be made much larger.

Revision 202015-07-05 - JorgenPetersen

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 An analysis has been done on DWC data from two runs in 2014, with beams focused on DWC0 and DWC2, resp. Events with three hits had tracks constructed using least squares fitting (Root, Minuit2). Below is shown some 2D graphs containing 100 tracks, the first ones with the beam focusing on DWC0, the second on DWC2. A beam spot size of about 4 cm * 4 cm is observed. It should be noted that the distributions are for events triggered by SC0 which means that the FULL beam profile is not shown. Actually, measurements of counts in the scintillator (SC2) from last year( see table 4.1 in the TR) show that there is a* large beam halo*, more than 20cm*20cm, most likely of muons. This should be taken into account by the Leo3G experiment.
Changed:
<
<
Plots with high statistics showing the track distributions in X and Y for all three DWCs are seen in the attachments, for the run focusing on DWC0. As well as plots of the angular distributions in X and Y which show that the mean of the angles is around 5 mrad.
>
>

Plots with high statistics showing the track distributions in X and Y for all three DWCs are seen in the attachments, for the run focusing on DWC0. As well as plots of the angular distributions in X and Y which show that the mean of the angles is around 5 mrad.
 By calculating the distance between fitted and measured points, the resolution is estimated to be about 1.5 mm.
Changed:
<
<
As mentioned above, the experiment will use electrons and positrons that oscillate in the crystal to produce gamma rays.
>
>

As mentioned above, the experiment will use electrons and positrons that oscillate in the crystal to produce gamma rays.
 In the BL4S 2014 technical Report, measurements are shown of the rate of electrons in a beam of 4 GeV/c, see table 4.3. A rate of about .95 kHz was observed. Assuming a beam profile of 4cm*4cm, this implies about 160 Hz per 1cm*1cm.
Changed:
<
<
For the diamond (4*4 mm**2) this means about 25 Hz of electrons. For the Si-Ge crystal, about 60 Hz. The electron contenst of the beam is strongly momentum dependent as shown in fig 2.2 of the TR.

The code developed is a monitoring program that can read events online or from a file: ~public/BL4S_DAQ/DataFlow/ROSMonitor/src (give the repository path ...) It may be of interest to provide an event display of a number of tracks defined by the user.

>
>
For the diamond (4*4 mm**2) this means about 25 Hz of electrons. For the Si-Ge crystal, about 60 Hz. The electron contents of the beam is strongly momentum dependent as shown in fig 2.2 of the TR.
The code developed is a monitoring program that can read events online or from a file:
~public/BL4S_DAQ/DataFlow/ROSMonitor/src/DWCTracking.cc (give the repository path ...) This program can be used to analyse the DWC data and provide a "burst" event display.
 

Revision 192015-07-05 - JorgenPetersen

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Beam

An analysis has been done on DWC data from two runs in 2014, with beams focused on DWC0 and DWC2, resp. Events with three hits had tracks constructed using least squares fitting (Root, Minuit2).
Changed:
<
<
Below is shown some 2D graphs containing 100 tracks, the first with the beam focusing on DWC0, the second on DWC2. A beam spot size less than 4 cm * 4 cm is observed. It should be noted that the distributions are for events triggered by SC0 which means that the FULL beam profile is not shown. Actually, measurements of counts in the scintillator (SC2) from last year show that there is a large beam halo, more than 20cm*20cm, most likely of muons. Plots with high statistics showing the track distributions in X and Y for all three DWCs are shown in the attachments. As well as plots of the angular distributions in X and Y which show that the mean of the angles is around 5 mrad.
>
>
Below is shown some 2D graphs containing 100 tracks, the first ones with the beam focusing on DWC0, the second on DWC2. A beam spot size of about 4 cm * 4 cm is observed. It should be noted that the distributions are for events triggered by SC0 which means that the FULL beam profile is not shown. Actually, measurements of counts in the scintillator (SC2) from last year( see table 4.1 in the TR) show that there is a* large beam halo*, more than 20cm*20cm, most likely of muons. This should be taken into account by the Leo3G experiment.

Plots with high statistics showing the track distributions in X and Y for all three DWCs are seen in the attachments, for the run focusing on DWC0. As well as plots of the angular distributions in X and Y which show that the mean of the angles is around 5 mrad.

 By calculating the distance between fitted and measured points, the resolution is estimated to be about 1.5 mm.
Added:
>
>
As mentioned above, the experiment will use electrons and positrons that oscillate in the crystal to produce gamma rays. In the BL4S 2014 technical Report, measurements are shown of the rate of electrons in a beam of 4 GeV/c, see table 4.3. A rate of about .95 kHz was observed. Assuming a beam profile of 4cm*4cm, this implies about 160 Hz per 1cm*1cm. For the diamond (4*4 mm**2) this means about 25 Hz of electrons. For the Si-Ge crystal, about 60 Hz. The electron contenst of the beam is strongly momentum dependent as shown in fig 2.2 of the TR.
 The code developed is a monitoring program that can read events online or from a file: ~public/BL4S_DAQ/DataFlow/ROSMonitor/src (give the repository path ...) It may be of interest to provide an event display of a number of tracks defined by the user.

Revision 182015-07-05 - JorgenPetersen

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META TOPICPARENT name="WebHome"
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Line: 35 to 35
 

Beam

An analysis has been done on DWC data from two runs in 2014, with beams focused on DWC0 and DWC2, resp. Events with three hits had tracks constructed using least squares fitting (Root, Minuit2).
Changed:
<
<
Below is shown some 2D graphs containing 100 tracks, the first with the beam focusing on DWC0, the second on DWC2. A beam spot size less than 4 cm * 4 cm is observed. Plots with high statistics showing the track distributions in X and Y for all three DWCs are shown in the attachments. By calculating the distance between fitted and measured points, the resolution is estimated to be about 1.5 mm.

>
>
Below is shown some 2D graphs containing 100 tracks, the first with the beam focusing on DWC0, the second on DWC2. A beam spot size less than 4 cm * 4 cm is observed. It should be noted that the distributions are for events triggered by SC0 which means that the FULL beam profile is not shown. Actually, measurements of counts in the scintillator (SC2) from last year show that there is a large beam halo, more than 20cm*20cm, most likely of muons. Plots with high statistics showing the track distributions in X and Y for all three DWCs are shown in the attachments. As well as plots of the angular distributions in X and Y which show that the mean of the angles is around 5 mrad. By calculating the distance between fitted and measured points, the resolution is estimated to be about 1.5 mm.
 The code developed is a monitoring program that can read events online or from a file: ~public/BL4S_DAQ/DataFlow/ROSMonitor/src (give the repository path ...) It may be of interest to provide an event display of a number of tracks defined by the user.
Added:
>
>
 

Crystals

Likely to have one diamond crystal and one Silicon-Germanium crystal. Si-Ge crystals may be made much larger.
Line: 125 to 126
 
META FILEATTACHMENT attachment="T9TracksY.jpeg" attr="" comment="T9 tracks 2014" date="1436023004" name="T9TracksY.jpeg" path="T9TracksY.jpeg" size="101621" user="jorgen" version="1"
META FILEATTACHMENT attachment="T9TracksXFocusDCW2.jpeg" attr="" comment="T9 tracks 2014" date="1436023005" name="T9TracksXFocusDCW2.jpeg" path="T9TracksXFocusDCW2.jpeg" size="91308" user="jorgen" version="1"
META FILEATTACHMENT attachment="T9TracksYFocusDWC2.jpeg" attr="" comment="T9 tracks 2014" date="1436023006" name="T9TracksYFocusDWC2.jpeg" path="T9TracksYFocusDWC2.jpeg" size="89015" user="jorgen" version="1"
Added:
>
>
META FILEATTACHMENT attachment="AngleTracksX.jpeg" attr="" comment="T9 tracks angle" date="1436095569" name="AngleTracksX.jpeg" path="AngleTracksX.jpeg" size="23849" user="jorgen" version="1"
META FILEATTACHMENT attachment="AngleTracksY.jpeg" attr="" comment="T9 tracks angle" date="1436095569" name="AngleTracksY.jpeg" path="AngleTracksY.jpeg" size="22668" user="jorgen" version="1"
META FILEATTACHMENT attachment="AngleTracksXFocusDWC2.jpeg" attr="" comment="T9 tracks angle" date="1436095569" name="AngleTracksXFocusDWC2.jpeg" path="AngleTracksXFocusDWC2.jpeg" size="23849" user="jorgen" version="1"
META FILEATTACHMENT attachment="AngleTracksYFocusDWC2.jpeg" attr="" comment="T9 tracks angle" date="1436095569" name="AngleTracksYFocusDWC2.jpeg" path="AngleTracksYFocusDWC2.jpeg" size="22668" user="jorgen" version="1"

Revision 172015-07-04 - JorgenPetersen

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  • Measure photon energy spectra in events with a charged particle traversing the crystal. Check the photon + charged particle recovers the incident energy spectrum.
  • Repeat measurement with the crystal in different orientations. Find point of maximum photon energy output.
Added:
>
>

Beam

An analysis has been done on DWC data from two runs in 2014, with beams focused on DWC0 and DWC2, resp. Events with three hits had tracks constructed using least squares fitting (Root, Minuit2). Below is shown some 2D graphs containing 100 tracks, the first with the beam focusing on DWC0, the second on DWC2. A beam spot size less than 4 cm * 4 cm is observed. Plots with high statistics showing the track distributions in X and Y for all three DWCs are shown in the attachments. By calculating the distance between fitted and measured points, the resolution is estimated to be about 1.5 mm.

The code developed is a monitoring program that can read events online or from a file: ~public/BL4S_DAQ/DataFlow/ROSMonitor/src (give the repository path ...) It may be of interest to provide an event display of a number of tracks defined by the user.

 

Crystals

Likely to have one diamond crystal and one Silicon-Germanium crystal. Si-Ge crystals may be made much larger.
Line: 99 to 113
 
META FILEATTACHMENT attachment="CERN_proposal_-_Accelerating_Africa.pdf" attr="" comment="Project proposal" date="1434024424" name="CERN_proposal_-_Accelerating_Africa.pdf" path="CERN_proposal_-_Accelerating_Africa.pdf" size="143928" user="brooks" version="1"
META FILEATTACHMENT attachment="AA_layout.png" attr="" comment="Proposed experimental layout" date="1434532478" name="AA_layout.png" path="AA_layout.png" size="72845" user="brooks" version="1"
Added:
>
>
META FILEATTACHMENT attachment="T9TracksX.pdf" attr="" comment="T9 tracks 2014" date="1436018153" name="T9TracksX.pdf" path="T9TracksX.pdf" size="27476" user="jorgen" version="1"
META FILEATTACHMENT attachment="T9TracksY.pdf" attr="" comment="T9 tracks 2014" date="1436018194" name="T9TracksY.pdf" path="T9TracksY.pdf" size="27503" user="jorgen" version="1"
META FILEATTACHMENT attachment="DWC0X.jpeg" attr="" comment="T9 tracks 2014" date="1436022668" name="DWC0X.jpeg" path="DWC0X.jpeg" size="24243" user="jorgen" version="1"
META FILEATTACHMENT attachment="DWC0Y.jpeg" attr="" comment="Tp9 tracks 2014" date="1436022777" name="DWC0Y.jpeg" path="DWC0Y.jpeg" size="24957" user="jorgen" version="1"
META FILEATTACHMENT attachment="DWC1X.jpeg" attr="" comment="T9 tracks 2014" date="1436022811" name="DWC1X.jpeg" path="DWC1X.jpeg" size="26411" user="jorgen" version="1"
META FILEATTACHMENT attachment="DWC1Y.jpeg" attr="" comment="T9 tracks 2014" date="1436022847" name="DWC1Y.jpeg" path="DWC1Y.jpeg" size="26185" user="jorgen" version="1"
META FILEATTACHMENT attachment="DWC2X.jpeg" attr="" comment="T9 tracks 2014" date="1436022890" name="DWC2X.jpeg" path="DWC2X.jpeg" size="24813" user="jorgen" version="1"
META FILEATTACHMENT attachment="DWC2Y.jpeg" attr="" comment="T9 tracks 2014" date="1436022891" name="DWC2Y.jpeg" path="DWC2Y.jpeg" size="24683" user="jorgen" version="1"
META FILEATTACHMENT attachment="T9TracksX.jpeg" attr="" comment="T9 tracks 2014" date="1436023003" name="T9TracksX.jpeg" path="T9TracksX.jpeg" size="100213" user="jorgen" version="1"
META FILEATTACHMENT attachment="T9TracksY.jpeg" attr="" comment="T9 tracks 2014" date="1436023004" name="T9TracksY.jpeg" path="T9TracksY.jpeg" size="101621" user="jorgen" version="1"
META FILEATTACHMENT attachment="T9TracksXFocusDCW2.jpeg" attr="" comment="T9 tracks 2014" date="1436023005" name="T9TracksXFocusDCW2.jpeg" path="T9TracksXFocusDCW2.jpeg" size="91308" user="jorgen" version="1"
META FILEATTACHMENT attachment="T9TracksYFocusDWC2.jpeg" attr="" comment="T9 tracks 2014" date="1436023006" name="T9TracksYFocusDWC2.jpeg" path="T9TracksYFocusDWC2.jpeg" size="89015" user="jorgen" version="1"

Revision 162015-07-01 - TimBrooks

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Development

Date Action
Added:
>
>
2015-07-01 Meeting with SergioBallestrero, MarkusJoos and TimBrooks - discussed status and plans moving forwards
 
2015-06-24 Vidyo meeting with SimonHConnell, MarkusJoos and TimBrooks - discussed experimental requirements
2015-06-16 Met with SergioBallestrero and SimonHConnell to discuss support for Team
2015-06-12 Contacted LauGatignon about magnet system
Spoke to Jerome Alozy about rotation stage for crystal
Line: 21 to 22
 
  • Proposed experimental layout:
    $name
Added:
>
>

Program

  • Team intends to work first with positrons, then electrons. Would electrons be better since they are a larger fraction of the Negative beam than positrons in the negative beam?
  • Need identification of electrons/positrons.
  • Need to extrapolate particles into the crystals to identify hit/no hit events. We rely on DWC0 & DWC1 to provide hit position on crystal. If we can construct a very small scintillator, we can trigger on events with a likely traversal of the crystal.
  • Should measure angular distribution of incoming beam, gain using DWC0 & DWC1.
  • Need to measure kinematics of the charged particles rejected by MNP17. Using the position of charged particles incident on DWC2, along with the initial trajectory in DWC0 & 1, we can derive particle momenta. Additionally, a LeadGlassCalorimeter block can independently measure the particle energy. With just the detectors in the beamline, we should be able to calibrate the tracking, energy and momentum mesurements by scanning the BeamLine energy with the Magnet off and then on.
  • Need to assess backgrounds before installing crystals into the beam. How much synchrotron radiation can we expect and can we measure it?
  • Need to position crystals in beam. How do we survey their positions? Can we measure their shape using the detector? Should we optimise their position?
  • Measure photon energy spectra in events with a charged particle traversing the crystal. Check the photon + charged particle recovers the incident energy spectrum.
  • Repeat measurement with the crystal in different orientations. Find point of maximum photon energy output.
 

Crystals

Likely to have one diamond crystal and one Silicon-Germanium crystal. Si-Ge crystals may be made much larger.
Line: 31 to 43
  Henric has the MNP17 magnet booked for the BL4S beam-time, and the SHIP emulsion test prior to it. The positioning of the magnet is not critical for the SHIP test, so we may decide its location.
Added:
>
>
The DelayWireChambers have an acceptance of 100mm. Using MNP17 at full field, 0.5GeV particles would be deflected by 99mm, 30cm behind the magnet. 10 GeV particles would be deflected by 98mm 11 meters behind MNP17.
 

Calorimetry

Will use LeadGlassCalorimeter blocks the reject arm, after the spectrometry tracking. The front surfaces of the blocks are $10\times10\,\mathrm{cm}$.
Line: 61 to 75
 

Open issues

Description Action by Status
Changed:
<
<
Sergio pointed out that the crystals have to be carefully aligned with respect to the beam. Therefore we need a suitable mechanical support Markus UJ will provide Labview controlled goniometer
>
>
Simulation of crystal interaction Contact Andrey Solovyov Waiting on progress from Simon
Integration of Labview angle measurements with DAQ chain Tim, Sergio Need information from Simon about goniometer model
 
Shipping for goniometer, crystal, etc. Markus, Simon  
Deleted:
<
<
Integration of Labview angle measurements with DAQ chain Tim, Sergio  
 
Understand requirements of Photon calorimeter - Team in Arhus have BGO calorimeter Tim, Christoph Need information from simulations as to expected energy ranges
We may be able to use the Opal calorimenters for photon and beam calorimeters
Deleted:
<
<
Simulation of crystal interaction Contact Andrey Solovyov Waiting on progress from Simon
The team proposes different materials that could be used for growing the crystal. Do we have a preference? Tim, Sergio Simon states the team will likely have one Diamond undulator and one Si-Ge
 
The team proposes to test the crystal with both positrons and electrons. Tim Estimate if T9 provides enough of the particles at the right energy and if inefficiencies in the particle identification could be a problem
Sergio mentioned that synchrotron radiation may cause a background that masks the x-rays from the crystal Tim, Sergio discuss this further
What impact does the beam environment have pre- and post-crystal? Would a vacuum tube be feasible? Tim Looking at NA43/59 documentation
Line: 74 to 86
 

Closed issues

Description By Status
Changed:
<
<
We will need a magnet Tim, Lau We have use of the MNP17 magnet we can decide on location
>
>
We will need a magnet Tim, Lau, Henric We have use of the MNP17 magnet we can decide on location
Sergio pointed out that the crystals have to be carefully aligned with respect to the beam. Therefore we need a suitable mechanical support Markus, Simon UJ will provide Labview controlled goniometer
The team proposes different materials that could be used for growing the crystal. Do we have a preference? Tim, Sergio Simon states the team will likely have one Diamond undulator and one Si-Ge
 

Resources

Revision 152015-07-01 - TimBrooks

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META TOPICPARENT name="WebHome"
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Line: 61 to 61
 

Open issues

Description Action by Status
Changed:
<
<
Sergio pointed out that the crystals have to be carefully aligned with respect to the beam. Therefore we need a suitable mechanical support Markus Contact team about the size and properties of the crystal and find a positioning system.
UJ will provide Labview controlled goniometer
>
>
Sergio pointed out that the crystals have to be carefully aligned with respect to the beam. Therefore we need a suitable mechanical support Markus UJ will provide Labview controlled goniometer
 
Shipping for goniometer, crystal, etc. Markus, Simon  
Integration of Labview angle measurements with DAQ chain Tim, Sergio  
Understand requirements of Photon calorimeter - Team in Arhus have BGO calorimeter Tim, Christoph Need information from simulations as to expected energy ranges
We may be able to use the Opal calorimenters for photon and beam calorimeters
Changed:
<
<
Simulation of crystal interaction Contact Andrey Solovyov  
The team proposes different materials that could be used for growing the crystal. Do we have a preference? Tim, Sergio look at the properties of the materials and make an educated guess
>
>
Simulation of crystal interaction Contact Andrey Solovyov Waiting on progress from Simon
The team proposes different materials that could be used for growing the crystal. Do we have a preference? Tim, Sergio Simon states the team will likely have one Diamond undulator and one Si-Ge
 
The team proposes to test the crystal with both positrons and electrons. Tim Estimate if T9 provides enough of the particles at the right energy and if inefficiencies in the particle identification could be a problem
Sergio mentioned that synchrotron radiation may cause a background that masks the x-rays from the crystal Tim, Sergio discuss this further
Changed:
<
<
We will need a magnet Tim, Lau We have use of the MNP17 magnet
What impact does the beam environment have pre- and post-crystal? Would a vacuum tube be feasible? Tim Looking at NA59 documentation
>
>
What impact does the beam environment have pre- and post-crystal? Would a vacuum tube be feasible? Tim Looking at NA43/59 documentation
 
Added:
>
>

Closed issues

Description By Status
We will need a magnet Tim, Lau We have use of the MNP17 magnet we can decide on location
 

Resources

Revision 142015-07-01 - TimBrooks

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META TOPICPARENT name="WebHome"
<!--  
Line: 24 to 24
 

Crystals

Likely to have one diamond crystal and one Silicon-Germanium crystal. Si-Ge crystals may be made much larger.
Added:
>
>
The estimated sizes are 4 x 4 mm for diamond and about 4 x 10 mm for Si-Ge.
 

Spectrometry

The MagneticField from the MNP17 magnet is $0.56\,\mathrm{T}$ over $0.52\,\mathrm{m}$. This should deflect a $10\,\mathrm{GeV}$ particle by $0.5^{\circ}$. Over $5\,\mathrm{m}$, that corresponds to a displacement of $47.7\,\mathrm{mm}$. This needs to be optimised to reject beam particles entering the calorimetry.
Added:
>
>
Henric has the MNP17 magnet booked for the BL4S beam-time, and the SHIP emulsion test prior to it. The positioning of the magnet is not critical for the SHIP test, so we may decide its location.
 

Calorimetry

Changed:
<
<
Will use LeadGlassCalorimeter blocks for the gamma Calorimeter and behind the reject arm, after the spectrometry tracking. The front surfaces of the blocks are $10\times10\,\mathrm{cm}$.
>
>
Will use LeadGlassCalorimeter blocks the reject arm, after the spectrometry tracking. The front surfaces of the blocks are $10\times10\,\mathrm{cm}$.

Need to investigate BGO Photon calorimeter from Aarhus group. Need sizing, power supply and readout requirements. The LeadGlassCalorimeter can be a backup for the Photon calorimeter.

 

Trigger

Changed:
<
<
Since the Crystal's acceptance will be small, require small trigger scintillators, or halo counter as a veto. Jorgen is skeptical of halo counters due to inefficiencies of the Scintillators, a small coinci
>
>
Since the Crystal's acceptance will be small, require small trigger scintillators, or halo counter as a veto. Jorgen is skeptical of halo counters due to inefficiencies of the Scintillators. A single small trigger scintillator may be better for this role - need to investigate possibility of small scintillator blocks.
 

Counters

Changed:
<
<
Scintillator plates needed at time reference for DWC. Possible backstop counter to tag muons?
>
>
Scintillator plates needed for trigger input. Possible backstop counter to tag muons?
 

Team contact

Team Twiki

Revision 132015-06-24 - TimBrooks

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Line: 12 to 12
 

Development

Date Action
Added:
>
>
2015-06-24 Vidyo meeting with SimonHConnell, MarkusJoos and TimBrooks - discussed experimental requirements
 
2015-06-16 Met with SergioBallestrero and SimonHConnell to discuss support for Team
2015-06-12 Contacted LauGatignon about magnet system
Spoke to Jerome Alozy about rotation stage for crystal
Line: 20 to 21
 
  • Proposed experimental layout:
    $name
Added:
>
>

Crystals

Likely to have one diamond crystal and one Silicon-Germanium crystal. Si-Ge crystals may be made much larger.
 

Spectrometry

The MagneticField from the MNP17 magnet is $0.56\,\mathrm{T}$ over $0.52\,\mathrm{m}$. This should deflect a $10\,\mathrm{GeV}$ particle by $0.5^{\circ}$. Over $5\,\mathrm{m}$, that corresponds to a displacement of $47.7\,\mathrm{mm}$. This needs to be optimised to reject beam particles entering the calorimetry.
Line: 52 to 56
 

Open issues

Description Action by Status
Changed:
<
<
Sergio pointed out that the crystals have to be carefully aligned with respect to the beam. Therefore we need a suitable mechanical support Markus Contact team about the size and properties of the crystal and find a positioning system. Question: Do we have to be able to change the position of the crystal from the control room via a remote control?
Jerome Alozy has a USB rotation stage we may be able to use for this purpose
We have to figure out if the photons that will be produced by the crystal can be detected with our calorimeter Tim, Christoph Contact the team about the expected energy and find out more about the Opal calorimenters (Cenk may have some details too)
>
>
Sergio pointed out that the crystals have to be carefully aligned with respect to the beam. Therefore we need a suitable mechanical support Markus Contact team about the size and properties of the crystal and find a positioning system.
UJ will provide Labview controlled goniometer
Shipping for goniometer, crystal, etc. Markus, Simon  
Integration of Labview angle measurements with DAQ chain Tim, Sergio  
Understand requirements of Photon calorimeter - Team in Arhus have BGO calorimeter Tim, Christoph Need information from simulations as to expected energy ranges
We may be able to use the Opal calorimenters for photon and beam calorimeters
Simulation of crystal interaction Contact Andrey Solovyov  
 
The team proposes different materials that could be used for growing the crystal. Do we have a preference? Tim, Sergio look at the properties of the materials and make an educated guess
The team proposes to test the crystal with both positrons and electrons. Tim Estimate if T9 provides enough of the particles at the right energy and if inefficiencies in the particle identification could be a problem
Sergio mentioned that synchrotron radiation may cause a background that masks the x-rays from the crystal Tim, Sergio discuss this further
Changed:
<
<
We will need a magnet Tim, Lau decide on the type of magnet
Lau says we have use of the MNP17 magnet
>
>
We will need a magnet Tim, Lau We have use of the MNP17 magnet
 
What impact does the beam environment have pre- and post-crystal? Would a vacuum tube be feasible? Tim Looking at NA59 documentation

Revision 122015-06-24 - TimBrooks

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Line: 27 to 27
 Will use LeadGlassCalorimeter blocks for the gamma Calorimeter and behind the reject arm, after the spectrometry tracking. The front surfaces of the blocks are $10\times10\,\mathrm{cm}$.

Trigger

Changed:
<
<
Since the Crystal's acceptance will be small, require small trigger scintillators, or halo veto.
>
>
Since the Crystal's acceptance will be small, require small trigger scintillators, or halo counter as a veto. Jorgen is skeptical of halo counters due to inefficiencies of the Scintillators, a small coinci
 

Counters

Scintillator plates needed at time reference for DWC. Possible backstop counter to tag muons?
Added:
>
>

Team contact

Team Twiki

Projects

 

Contacts

Revision 112015-06-17 - TimBrooks

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Line: 55 to 55
 

Resources

Added:
>
>
 

-- TimBrooks - 2015-06-03

Revision 102015-06-17 - TimBrooks

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Experimental design

  • Proposed experimental layout:
Changed:
<
<
CERN_proposal_-_Accelerating_Africa_img2.png
>
>
$name
 

Spectrometry

The MagneticField from the MNP17 magnet is $0.56\,\mathrm{T}$ over $0.52\,\mathrm{m}$. This should deflect a $10\,\mathrm{GeV}$ particle by $0.5^{\circ}$. Over $5\,\mathrm{m}$, that corresponds to a displacement of $47.7\,\mathrm{mm}$. This needs to be optimised to reject beam particles entering the calorimetry.
Line: 26 to 26
 

Calorimetry

Will use LeadGlassCalorimeter blocks for the gamma Calorimeter and behind the reject arm, after the spectrometry tracking. The front surfaces of the blocks are $10\times10\,\mathrm{cm}$.
Added:
>
>

Trigger

Since the Crystal's acceptance will be small, require small trigger scintillators, or halo veto.

Counters

Scintillator plates needed at time reference for DWC. Possible backstop counter to tag muons?
 

Contacts

Line: 54 to 60
 -- TimBrooks - 2015-06-03

META FILEATTACHMENT attachment="CERN_proposal_-_Accelerating_Africa.pdf" attr="" comment="Project proposal" date="1434024424" name="CERN_proposal_-_Accelerating_Africa.pdf" path="CERN_proposal_-_Accelerating_Africa.pdf" size="143928" user="brooks" version="1"
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META FILEATTACHMENT attachment="CERN_proposal_-_Accelerating_Africa_img2.png" attr="" comment="Proposed experimental layout" date="1434388394" name="CERN_proposal_-_Accelerating_Africa_img2.png" path="CERN_proposal_-_Accelerating_Africa_img2.png" size="73651" user="brooks" version="1"
>
>
META FILEATTACHMENT attachment="AA_layout.png" attr="" comment="Proposed experimental layout" date="1434532478" name="AA_layout.png" path="AA_layout.png" size="72845" user="brooks" version="1"

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Accelerating Africa Team

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 The MagneticField from the MNP17 magnet is $0.56\,\mathrm{T}$ over $0.52\,\mathrm{m}$. This should deflect a $10\,\mathrm{GeV}$ particle by $0.5^{\circ}$. Over $5\,\mathrm{m}$, that corresponds to a displacement of $47.7\,\mathrm{mm}$. This needs to be optimised to reject beam particles entering the calorimetry.

Calorimetry

Changed:
<
<
Will use LeadGlassCalorimeter blocks for the gamma Calorimeter and behind the reject arm, after the spectrometry tracking.
>
>
Will use LeadGlassCalorimeter blocks for the gamma Calorimeter and behind the reject arm, after the spectrometry tracking. The front surfaces of the blocks are $10\times10\,\mathrm{cm}$.
 

Contacts

Line: 40 to 38
 

Open issues

Description Action by Status
Changed:
<
<
Sergio pointed out that the crystals have to be carefully aligned with respect to the beam. Therefore we need a suitable mechanical support Markus Contact team about the size and properties of the crystal and find a positioning system. Question: Do we have to be able to change the position of the crystal from the control room via a remote control?
Jerome Alozy has a USB rotation stage we may be able to use for this purpose
Simon says a goniometer with labview control can be provided
>
>
Sergio pointed out that the crystals have to be carefully aligned with respect to the beam. Therefore we need a suitable mechanical support Markus Contact team about the size and properties of the crystal and find a positioning system. Question: Do we have to be able to change the position of the crystal from the control room via a remote control?
Jerome Alozy has a USB rotation stage we may be able to use for this purpose
 
We have to figure out if the photons that will be produced by the crystal can be detected with our calorimeter Tim, Christoph Contact the team about the expected energy and find out more about the Opal calorimenters (Cenk may have some details too)
The team proposes different materials that could be used for growing the crystal. Do we have a preference? Tim, Sergio look at the properties of the materials and make an educated guess
The team proposes to test the crystal with both positrons and electrons. Tim Estimate if T9 provides enough of the particles at the right energy and if inefficiencies in the particle identification could be a problem
Sergio mentioned that synchrotron radiation may cause a background that masks the x-rays from the crystal Tim, Sergio discuss this further
We will need a magnet Tim, Lau decide on the type of magnet
Lau says we have use of the MNP17 magnet
Added:
>
>
What impact does the beam environment have pre- and post-crystal? Would a vacuum tube be feasible? Tim Looking at NA59 documentation
 

Resources

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Accelerating Africa Team

 

Development

Date Action
Added:
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2015-06-16 Met with SergioBallestrero and SimonHConnell to discuss support for Team
 
2015-06-12 Contacted LauGatignon about magnet system
Spoke to Jerome Alozy about rotation stage for crystal
Line: 18 to 22
 
  • Proposed experimental layout:
    CERN_proposal_-_Accelerating_Africa_img2.png
Changed:
<
<
The MagneticField from the MNP17 magnet it $0.56\,\mathrm{T}$ over $0.52\,\mathrm{m}$. This should deflect a $10\,\mathrm{GeV}$ particle by $0.5^{\circ}$. Over $5\,\mathrm{m}$, that corresponds to a displacement of $47.7\,\mathrm{mm}$.
>
>

Spectrometry

The MagneticField from the MNP17 magnet is $0.56\,\mathrm{T}$ over $0.52\,\mathrm{m}$. This should deflect a $10\,\mathrm{GeV}$ particle by $0.5^{\circ}$. Over $5\,\mathrm{m}$, that corresponds to a displacement of $47.7\,\mathrm{mm}$. This needs to be optimised to reject beam particles entering the calorimetry.

Calorimetry

Will use LeadGlassCalorimeter blocks for the gamma Calorimeter and behind the reject arm, after the spectrometry tracking.
 

Contacts

Line: 32 to 40
 

Open issues

Description Action by Status
Changed:
<
<
Sergio pointed out that the crystals have to be carefully aligned with respect to the beam. Therefore we need a suitable mechanical support Markus Contact team about the size and properties of the crystal and find a positioning system. Question: Do we have to be able to change the position of the crystal from the control room via a remote control?
Jerome Alozy has a USB rotation stage we may be able to use for this purpose
>
>
Sergio pointed out that the crystals have to be carefully aligned with respect to the beam. Therefore we need a suitable mechanical support Markus Contact team about the size and properties of the crystal and find a positioning system. Question: Do we have to be able to change the position of the crystal from the control room via a remote control?
Jerome Alozy has a USB rotation stage we may be able to use for this purpose
Simon says a goniometer with labview control can be provided
 
We have to figure out if the photons that will be produced by the crystal can be detected with our calorimeter Tim, Christoph Contact the team about the expected energy and find out more about the Opal calorimenters (Cenk may have some details too)
The team proposes different materials that could be used for growing the crystal. Do we have a preference? Tim, Sergio look at the properties of the materials and make an educated guess
The team proposes to test the crystal with both positrons and electrons. Tim Estimate if T9 provides enough of the particles at the right energy and if inefficiencies in the particle identification could be a problem

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2015-06-12 Contacted LauGatignon about magnet system
Spoke to Jerome Alozy about rotation stage for crystal
Added:
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Experimental design

  • Proposed experimental layout:
    CERN_proposal_-_Accelerating_Africa_img2.png

The MagneticField from the MNP17 magnet it $0.56\,\mathrm{T}$ over $0.52\,\mathrm{m}$. This should deflect a $10\,\mathrm{GeV}$ particle by $0.5^{\circ}$. Over $5\,\mathrm{m}$, that corresponds to a displacement of $47.7\,\mathrm{mm}$.

 

Contacts

Line: 41 to 47
 -- TimBrooks - 2015-06-03

META FILEATTACHMENT attachment="CERN_proposal_-_Accelerating_Africa.pdf" attr="" comment="Project proposal" date="1434024424" name="CERN_proposal_-_Accelerating_Africa.pdf" path="CERN_proposal_-_Accelerating_Africa.pdf" size="143928" user="brooks" version="1"
Added:
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META FILEATTACHMENT attachment="CERN_proposal_-_Accelerating_Africa_img2.png" attr="" comment="Proposed experimental layout" date="1434388394" name="CERN_proposal_-_Accelerating_Africa_img2.png" path="CERN_proposal_-_Accelerating_Africa_img2.png" size="73651" user="brooks" version="1"

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Development

Date Action
Changed:
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<
2015-06-03  
>
>
2015-06-12 Contacted LauGatignon about magnet system
Spoke to Jerome Alozy about rotation stage for crystal
 

Contacts

Line: 26 to 26
 

Open issues

Description Action by Status
Changed:
<
<
Sergio pointed out that the crystals have to be carefully aligned with respect to the beam. Therefore we need a suitable mechanical support Markus Contact team about the size and properties of the crystal and find a positioning system. Question: Do we have to be able to change the position of the crystal from the control room via a remote control?
>
>
Sergio pointed out that the crystals have to be carefully aligned with respect to the beam. Therefore we need a suitable mechanical support Markus Contact team about the size and properties of the crystal and find a positioning system. Question: Do we have to be able to change the position of the crystal from the control room via a remote control?
Jerome Alozy has a USB rotation stage we may be able to use for this purpose
 
We have to figure out if the photons that will be produced by the crystal can be detected with our calorimeter Tim, Christoph Contact the team about the expected energy and find out more about the Opal calorimenters (Cenk may have some details too)
The team proposes different materials that could be used for growing the crystal. Do we have a preference? Tim, Sergio look at the properties of the materials and make an educated guess
The team proposes to test the crystal with both positrons and electrons. Tim Estimate if T9 provides enough of the particles at the right energy and if inefficiencies in the particle identification could be a problem
Sergio mentioned that synchrotron radiation may cause a background that masks the x-rays from the crystal Tim, Sergio discuss this further
Changed:
<
<
We will need a magnet Tim, Lau decide on the type of magnet
>
>
We will need a magnet Tim, Lau decide on the type of magnet
Lau says we have use of the MNP17 magnet
 

Resources

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Project Proposal Proposal video
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Development

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Resources

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  -- TimBrooks - 2015-06-03 \ No newline at end of file
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META FILEATTACHMENT attachment="CERN_proposal_-_Accelerating_Africa.pdf" attr="" comment="Project proposal" date="1434024424" name="CERN_proposal_-_Accelerating_Africa.pdf" path="CERN_proposal_-_Accelerating_Africa.pdf" size="143928" user="brooks" version="1"

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Project Proposal Proposal video

Development

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Date Action
2015-06-03  
 

Contacts

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Changed:
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  • Sergio Ballestrero link. Atlas sysadmin and employed by Univ. Johannesburg. Simon
Connell (mentioned in the proposal) is his supervisor.
  • Chris Lee link. Atlas sysadmin and employed by Univ. Johannesburg
>
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Open issues

Line: 25 to 25
 
The team proposes different materials that could be used for growing the crystal. Do we have a preference? Tim, Sergio look at the properties of the materials and make an educated guess
The team proposes to test the crystal with both positrons and electrons. Tim Estimate if T9 provides enough of the particles at the right energy and if inefficiencies in the particle identification could be a problem
Sergio mentioned that synchrotron radiation may cause a background that masks the x-rays from the crystal Tim, Sergio discuss this further
Changed:
<
<
We will need a magnet Tim, Lau decide on the type of magent

>
>
We will need a magnet Tim, Lau decide on the type of magnet
 
Added:
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Resources

 

-- TimBrooks - 2015-06-03

Revision 22015-06-03 - MarkusJoos

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  • Sergio Ballestrero link. Atlas sysadmin and employed by Univ. Johannesburg. Simon
Connell (mentioned in the proposal) is his supervisor.
  • Chris Lee link. Atlas sysadmin and employed by Univ. Johannesburg
 
Added:
>
>

Open issues

Description Action by Status
Sergio pointed out that the crystals have to be carefully aligned with respect to the beam. Therefore we need a suitable mechanical support Markus Contact team about the size and properties of the crystal and find a positioning system. Question: Do we have to be able to change the position of the crystal from the control room via a remote control?
We have to figure out if the photons that will be produced by the crystal can be detected with our calorimeter Tim, Christoph Contact the team about the expected energy and find out more about the Opal calorimenters (Cenk may have some details too)
The team proposes different materials that could be used for growing the crystal. Do we have a preference? Tim, Sergio look at the properties of the materials and make an educated guess
The team proposes to test the crystal with both positrons and electrons. Tim Estimate if T9 provides enough of the particles at the right energy and if inefficiencies in the particle identification could be a problem
Sergio mentioned that synchrotron radiation may cause a background that masks the x-rays from the crystal Tim, Sergio discuss this further
We will need a magnet Tim, Lau decide on the type of magent

 -- TimBrooks - 2015-06-03 \ No newline at end of file

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META TOPICPARENT name="WebHome"
Project Proposal Proposal video

Development

2015-06-03

Contacts

-- TimBrooks - 2015-06-03

 
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