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



  • 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 !



  • 1 frame has 6 scintillators of 10 x 135 cm2 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 Antonio_CTrigger.png
  • the trigger logic is build with nim electronics. It looks schemically like this 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

* LeCroy 622 Quad 2-fold Logical Unit

* 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

Link to Besma's spreadsheet


A dedicated twiki with information on simulation and recontruction can be found here

-- WouterHulsbergen - 06 Sep 2007

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng Antonio_CTrigger.png r2 r1 manage 33.0 K 2007-09-06 - 09:32 WouterHulsbergen schematic view of setup, outdated
PowerPointppt Cosmix_StNect.ppt r1 manage 86.5 K 2007-09-06 - 12:10 WouterHulsbergen Draft for talk in St Nectaire
PowerPointppt Dimensions_setup.ppt r1 manage 109.5 K 2008-01-07 - 14:31 BesmaMcharek Current dimensions Cosmic setup
PowerPointppt Electronic_setup.ppt r3 r2 r1 manage 61.0 K 2007-09-19 - 10:42 BesmaMcharek Electronic set-up
Microsoft Excel Spreadsheetxls Frame_tests.xls r7 r6 r5 r4 r3 manage 172.5 K 2007-10-30 - 12:03 BesmaMcharek Besma's spreadsheet
PNGpng scintillatorframe.png r1 manage 30.0 K 2007-09-06 - 10:02 WouterHulsbergen  
PNGpng triggerlogic.png r1 manage 75.6 K 2007-09-06 - 10:16 WouterHulsbergen trigger logic
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Topic revision: r17 - 2008-01-07 - BesmaMcharek
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