Dual Readout - A project for future lepton colliders

Dual readout offers competitive electromagnetic and hadronic calorimetry with one detector. Its main advantages are:

  • Excellent native resolution for the measurement of electrons, photons and jets.
  • Excellent lateral granularity.

The project counts contributing institutions in the Italy, United States, UK, Croatia, South Korea.

If you want to stay up to date with what happens in the Dual Readout world, please sign up through https://egroups.cern.ch to the e-group ideal-dualreadout.

The page below contains practical informations and details about the test beam data takings happening in the period 2012-2019. Important links are available below:

  • Software for Simulation and Reconstruction: Several G4 simulations of Dual Readout prototypes are available. They span test beam and full collider 4pi geometries. For the some of the 4pi geometries, some reconstruction software is available. The page is DualReadoutSoftware.
  • Hardware Development for the 2020 Test Beam: page used to keep track of the details for the construction of the tubeless prototype to be put on beam in Autumn 2020.

Testbeam and Hardware Information

Phone numbers

  • control room phone number: 76773
  • Silvia 162202
  • Roberto 165714
  • Gabriella (+39 3288696660)
  • Alessandro 165564
  • CCC 77500, 70475
  • Technical probles 72201
  • Richard +1 806 7730056
  • Fabrizio +39 339 5986153
  • Michele C +44 74 389 383 45

TestBeam information

You can find information about shift schedule, on call shifts, DQ shifts, measurement programs here:

Testbeam for the new capillry-based prototypes

Older Testbeams with plate based-prototypes

Shifter instructions:

How to take a run:

  • click on the DAQ icon on the desktop.
  • set the parameter for the run
    • # of Beam Events: number of events you want to take
    • Beam: type of beam
    • Energy: signed, negative for negative particles
    • Beam File: write the name of the beam file (eg. H8C.714)
    • Table Coordinates: write X,Y, angle as read on the camera monitor
    • Readout Option: check on DRS or scope if included in the readout. If you don't click, only ADCs will be read out
    • Phy to Ped ratio: desidered ratio between phys evt and ped evt (default 10)
    • Trigger: check the correct trigger configuration. Please note: call Gabriella or Silvia before changing this!
    • Detectors: add the list of detectors and any other info you want
  • Click on Test run if you are doing runs that will be no needed to analyzed offline
  • click on Start to start the run
  • click on Stop if you want to stop the run before maximum events have been reached
  • in case of problems click on CleanUp


Data Files

To open a root file with plots:

root ~/storage/hbook/datafile_histo_runXXX.root  

In case the file has not been created for run XXX:

doOfflineHistoDrs4 XXX data      

Pedestal Files

You need to create pedestal histogram file for the run XXX since it is not done automatically:

doOfflineHistDrs4o XXX pedestal      

To open a root file with pedestal plots:

 root   ~/storage/hbook/datafile_histo_pedestal_runXXX.root  

Useful macros for online DQ

In order to do faster online analysis we have prepared some macros; you can find them in:


To execute them for run number XXX:

root -l 
root [] > .x MacroName.cxx("parameters")

They are not "static", you can modify them in order to fit with measurements you are doing.

Accesses and beam setup

How to access the experimental area

request an access opening from the top menu: Access Command;

select the door PPE168 (the last one in the list) and click on the "BEAM OFF" button. Read when the procedure is ready. ATTENTION even if our door is marked as Safe, make sure that the beam is OFF (from pink beam chambers profiles). If there is any discrepancy call the ccc or manually set Bend1 and Bend 2 to 0 Amps.

Then go down, click on the screen Request Access, validate with red button, Key Release, take the key and go.

At the end the reverse both downstairs (remember you have to wait 1 minute before validation). Then go up and click Beam On.

Passing from free access to key access

When you pass from free access to key access, a survey has to be done. Only two persons per experiment can have permisison to do that. Please call Gabriella or Silvia.

How to change beam files

See BeamSetup

Detector layout

  • Coordinate system
    This is how the detector will move if you follow those coordinates as you see from the webcams: RD52scheme.jpg

  • Newdream Pb calorimeter tower schema:

* Newdream Cu calorimeter PMT location schematower schema:

* The location of PMTs for the Cu module is different from the Pb one, Scintillation towers, see the schema for Cu modue

  • New Dream Pavia
    8 channels, four for scintillation, four for Cherenkov, readout with DRS.
    Each tower is splitted with two signals, e.g. TC1, TS1.
    HV channels: Q1, Q2, Q3, Q4, S\, S2, S3, S4.
    DRS channels: GR0-0, --> GR0-3 Cherenkov, GR1-0 --> GR1-3 Scintillation
    Beam point of view:

  • New Dream Pisa
    Tower name and position is the same as the one from Pavia, the only difference is where scintillation PMTs are.
    Differences are:
    • transversal dimensions of towers 44.45 mm for PIsa, 46 mm Pavia;
    • number of fibers per each bundle: 512 PI, 529 PV

Meetings, reports....

Trouble shooting

  • DAQ freezing:
    • press the Clean Up button on the graphical interface
    • Make sure the ~dreamtest/DreamDaq area is still mounted over sshfs, otherwise sshfs pcdreamus:DreamDaq DreamDaq from the dreamtest account
    • if that does not work: reboot both pcs and power cycle VME crates
  • Moving table don't move any more:
    • Re-enable the circuit breaker that is in the entrance of our control room.
  • Probles with accesses:
    • Call the ccc and tell them the same of our door (PPE 168)
  • Number of events per spill drops during the run:
    • check the status of quadrupoles (Q16 sometimes trips and goes to 0A) and call the ccc
  • DRS looses events:
    • restart the run

Useful links


Some Information

  • How to set the printer :
    • URL: ipp://pcdream.cern.ch/printers/laser_lan
    • protocol: ipp
    • Host: pcdream.cern.ch

  • How to print from root:
    • Printer command:
       lpr -P
      Printer name:

  • High Voltage via telnet
    •  telnet dream-hv.cern.ch 1527 
    •  telnet dream-hv-2.cern.ch 1527 

* DreamPasswords

Dream data analysis

Please refer to DreamDataAnalysis page for all the information (good run list, data access, data structure ... )

Dream TB Installation Documentation

The main source of information are the logbooks, especially Gabriella's and Silvia's.

Documents on the TB Installation

Dream DAQ Documentation

The source code for the Dream DAQ software is available on svn in a cern repository. Use the following command to get a local copy:

svn co svn+ssh://<lxplus_username>@svn.cern.ch/reps/dream-daq/trunk/DreamDaq/

The source code can also be browsed online at https://svnweb.cern.ch/trac/dream-daq/browser

This is an index of the information available on the DREAM DAQ.

-- SilviaFranchino - 18 June 2011 -- MicheleCascella - 21 June 2011 -- GabriellaGaudio - 18 June 2011

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng PMT_Cu.png r1 manage 93.9 K 2014-12-07 - 17:20 SilviaFranchino  
JPEGjpg RD52scheme.jpg r1 manage 1117.9 K 2012-11-24 - 22:29 GabriellaGaudio calorimeter tower schema
PNGpng Screen_shot_2011-07-23_at_10.39.55.png r1 manage 28.2 K 2011-07-23 - 10:55 SilviaFranchino  
PNGpng Screenshot-3.png r1 manage 8.8 K 2011-07-25 - 01:49 SilviaFranchino  
PNGpng Screenshot-6.png r1 manage 25.3 K 2011-06-18 - 13:53 SilviaFranchino  
PNGpng Screenshot.png r1 manage 420.0 K 2011-06-18 - 13:47 SilviaFranchino  
PDFpdf corresponding_location_pmt.pdf r1 manage 24.4 K 2014-12-07 - 17:17 SilviaFranchino  
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Topic revision: r121 - 2021-08-24 - GabriellaGaudio
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