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

• Thomas in June 2007 LHCb week
• 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
• 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
• the trigger logic is build with nim electronics. It looks schemically like this . We need a full description, including nim modules used, delays, etc. Look at nim specification for delays inside electronics.

Electronic unit used

LeCroy 622 Quad 2-fold Logical Unit

* LeCroy 429A Logic Fan-In/Out

Log book

Link to Besma's spreadsheet

Reconstruction

• simulation
  • somebody needs to implement a simple cosmics generator in Gauss
  • need all dimensions
  • need estimates of muon flux and momentum distribution
• recontruction
  • single track, should be simple
  • complications: showers, drift-time difficult (may have poor trigger phase measurement)
• calibration

-- WouterHulsbergen - 06 Sep 2007

• Electronic_setup.ppt: Electronic set-up