OTrCosmics < LHCb

LHCb Web>LHCbOT>OTrCosmics (2008-01-07, BesmaMcharek) (raw view)

---+ Outer Tracker Cosmics

This page serves as documentation for the OT cosmics setup in the LHCb pit. 

Expected rate, based on measurements in the pit: about 2000 events/day


---++ Presentations
   * [[http://indico.cern.ch/contributionDisplay.py?contribId=11&sessionId=0&confId=16385][Thomas in June 2007 LHCb week]]
   * [[%ATTACHURL%/Cosmix_StNect.ppt][Draft for talk in St Nectaire]]

---++ Aim
   * in situ tuning-in and measurements of efficiency and resolution 
   * have some real data in brunel, such that we can check that software is actually working
   * reconstruct the first track in LHCb !

---++ Setup

Scintillators:
   * 1 frame has 6 scintillators of 10 x 135 cm2 %ATTACHURL%/scintillatorframe.png
   * there are 4 frames
   * each scintillator is read out by 2 PMs
   * 1st set of two frames is positioned horizontally, next to the magnet, at about 3 meters from the cavern floor
   * 2nd set will be positioned vertically, paralellel and behind station 3, at about 10 meters from the cavern floor. This is an old picture of the setup: the 2nd set of frames will eventually be vertical %ATTACHURL%/Antonio_CTrigger.png
   * the trigger logic is build with nim electronics. It looks schemically like this %ATTACHURL%/triggerlogic.png. We need a full description, including nim modules used, delays, etc. Look at nim specification for delays inside electronics.

  The dimensions and different FE_channels are given in the following slides
---++ Electronic set-up
  * Nikhef custom made octal discriminator

  * [[http://www-esd.fnal.gov/esd/catalog/main/Lcrynim/622.htm][LeCroy 622 Quad 2-fold Logical Unit]] 
 
  * [[http://www-esd.fnal.gov/esd/catalog/main/lcrynim/429a-spec.htm][LeCroy 429A Logic Fan-In/Out]]    
  
---++ High Voltage values PMTs
 * FU(Upper Frame)
| *scintillator* |channel# | *A[ V ]* |channel# | *B[ V ]* |
| S1               |  C0        |  1775   |  C6        |   1700  |
| S2               |  C1        |  1700   |  C7        |   1700  |
| S3               |  C2        |  1700   |  C8        |   1775  |
| S4               |  C3        |  1750   |  C9        |   1700  |
| S5               |  C4        |  1730   |  C10      |   1750  |
| S6               |  C5        |  1700   |  C11      |   1700  |
| S25             |  C12      |  1700   |  C18      |   1700  |
| S26             |  C13      |  1700   |  C19      |   1775  |
| S27             |  C14      |  1700   |  C20      |   1700  |
| S28             |  C15      |  1700   |  C21      |   1775  |
| S29             |  C16      |  1700   |  C22      |   1650  |
| S30             |  C17      |  1700   |  C23      |   1700  |

 * FL(Lower Frame)*
| *scintillator* |channel# | *A[ V ]* |channel# | *B[ V ]* |
| S13             |  C0        |  1600   |  C6        |   1700  |
| S14             |  C1        |  1700   |  C7        |   1700  |
| S15             |  C2        |  1700   |  C8        |   1700  |
| S16             |  C3        |  1700   |  C9        |   1800  |
| S17             |  C4        |  1750   |  C10      |   1750  |
| S18             |  C5        |  1700   |  C11      |   1700  |
| S19             |  C12      |  1700   |  C18      |   1700  |
| S20             |  C13      |  1700   |  C19      |   1700  |
| S21             |  C14      |  1775   |  C20      |   1700  |
| S22             |  C15      |  1825   |  C21      |   1800  |
| S23             |  C16      |  1775   |  C22      |   1775  |
| S24             |  C17      |  1700   |  C23      |   1700  |
---++ Input modified FE boards
 
|*FE channel#  FU*| *PMT channel* |  ^ |*FE channel# FU*| *PMT channel* |
| c1                 |  A13            |  ^ | c1                 |  A1            |
| c2                 |  B13            |   ^| c2                 |  B1            |
| c3                 |  A14            |   ^| c3                 |  A2            |
| c4                 |  B14            |^   | c4                 |  B2            |
| c5                 |  A15            |  ^ | c5                 |  A3            |
| c6                 |  B15            |  ^ | c6                 |  B3            |
| c7                 |  A16            |  ^ | c7                 |  A4            |
| c8                 |  B16            |  ^ | c8                 |  B4            |
| c9                 |  A17            |  ^ | c9                 |  A5            |
| c10               |  B17            |  ^ | c10               |  B5            |
| c11               |  A18            |^   | c11               |  A6            |
| c12               |  B18            |  ^ | c12               |  B6            |
| c13               |  A19            |^   | c13               |  A25          |
| c14               |  B19            | ^  | c14               |  B25          |
| c15               |  A20            |  ^ | c15               |  A26          |
| c16               |  B20            | ^  | c16               |  B26          |
| c17               |  A21            |  ^ | c17               |  A27          |
| c18               |  B21            |  ^ | c18               |  B27          |
| c19               |  A22            |   ^| c19               |  A28          |
| c20               |  B22            |   ^| c20               |  B28          |
| c21               |  A23            | ^  | c21               |  A29          |
| c22               |  B23            | ^  | c22               |  B29          |
| c23               |  A24            |   ^| c23               |  A30          |
| c24               |  B24            |   ^| c24               |  B30          |



---++ Log book

[[%ATTACHURL%/Frame_tests.xls][Link to Besma's spreadsheet]]

---++ Reconstruction
A dedicated twiki with information on simulation and recontruction can be found [[OTrCosmicsReconstruction][here]]


-- Main.WouterHulsbergen - 06 Sep 2007

   * [[%ATTACHURL%/Electronic_setup.ppt][Electronic_setup.ppt]]: Electronic set-up

   * [[%ATTACHURL%/Dimensions_setup.ppt][Dimensions_setup.ppt]]: Current dimensions Cosmic setup

Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who	Comment
png	Antonio_CTrigger.png	r2 r1	manage	33.0 K	2007-09-06 - 09:32	WouterHulsbergen	schematic view of setup, outdated
ppt	Cosmix_StNect.ppt	r1	manage	86.5 K	2007-09-06 - 12:10	WouterHulsbergen	Draft for talk in St Nectaire
ppt	Dimensions_setup.ppt	r1	manage	109.5 K	2008-01-07 - 14:31	BesmaMcharek	Current dimensions Cosmic setup
ppt	Electronic_setup.ppt	r3 r2 r1	manage	61.0 K	2007-09-19 - 10:42	BesmaMcharek	Electronic set-up
xls	Frame_tests.xls	r7 r6 r5 r4 r3	manage	172.5 K	2007-10-30 - 12:03	BesmaMcharek	Besma's spreadsheet
png	scintillatorframe.png	r1	manage	30.0 K	2007-09-06 - 10:02	WouterHulsbergen
png	triggerlogic.png	r1	manage	75.6 K	2007-09-06 - 10:16	WouterHulsbergen	trigger logic

Topic revision: r17 - 2008-01-07 - BesmaMcharek

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