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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.

Electronic set-up

* Nikhef custom made octal discriminator

* LeCroy 622 Quad 2-fold Logical Unit

* LeCroy 429A Logic Fan-In/Out

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PNGpng Antonio_CTrigger.png r2 r1 manage 33.0 K 2007-09-06 - 09:32 WouterHulsbergen schematic view of setup, outdated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 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 r6 r5 r4 r3 r2 manage 146.5 K 2007-10-25 - 12:26 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: r11 - 2007-10-25 - BesmaMcharek
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