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
- 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 set-up
* Nikhef custom made octal discriminator
*
LeCroy 622 Quad 2-fold Logical Unit
*
LeCroy 429A Logic Fan-In/Out
High Voltage values PMTs
* FL(Lower 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 |
* FU(Upper 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