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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

Presentations

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 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

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
S34 C17 1700 C23 1700

Log book

Link to Besma's spreadsheet

Reconstruction

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PNGpng Antonio_CTrigger.png r2 r1 manage 33.0 K 2007-09-06 - 09:32 WouterHulsbergen schematic view of setup, outdated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: r14 - 2007-10-29 - BesmaMcharek
 
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