CLC measurements during
commissioning Run
!!! Need to be established as soon as possible
when collisions ocurr
1- A single stable luminosity number
* Hit counting via ADMEM to DPM (w/ scaler backup)
see plan
+ Bunch-by-bunch instantaneous and integrated (over a store)
--->
to ACNET
---> to CLLD
2- Minimum Bias trigger
* w/
rate +/- 20% of real collissions
3- Z-profile measurements
* For cogging scans (w/ fast
feedback)
Checklist
for before commissioning:
Highest priority:
-
Finalize gain studies, choose LED, -> recalibrate
(AS)
-
Establish Xilinx thresholds expected based on
gain (JK)
-
Finalize Online code with baseline method
(SM/SMW/JK)
-
Implement estimator vs luminosity relationship
from simulations
-
Cross-time DPM's with B0/BC etc.
-
Decide on strobe for DPM (clk vs beam cross)
-
Establish parallel method with "empty crossings"
-
Establish Z profile output
-
Establish routine diagnostics for electronics/DAQ
(AS)
-
DB_ANA
-
CLCCAL
-
QIETEST
-
???
-
Establish routine diagnostics for CLC performance
(SMW)
-
Cross-time DPM's with B0/BC etc. - adjust code
(SMW/SM)
-
Gate for transition board (JK/AN)
-
NIM first
-
Prepare Gating board for later
-
Simulations (DT)
-
Hit count (and empty crossings) vs luminosity
relationships
-
CLC acceptance + uncertainty for these methods
-
Possible corrections for dead channels
-
Beam profile dependence
-
Study coincidence rate and rate asymmetry vs Z
position
-
Trigger (SMW/SK/DA/DT)
-
Study afterpulses and
-
set coincidence level
-
set transition board thresholds
-
dead time?
Medium priority:
-
Z profile + timing (AS)
-
Calibrate To's with LED
-
TDC in 6U crate - incorporate
-
Offline times are slow feedback for Z
-
Use simulations to map timing distribution vs
Z position
-
Xilinx test with particle counting algorithm (JK)
CLC commissioning studies
-
Offline luminosity measurements (AS)
-
Establish amplitude distribution
-
Set thresholds in Xilinx and Transition Board
-
Single interaction studies
(AS/DT/SK)
-
Calibrate # of particles/interaction
-
Calibrate # hits/interaction
-
Calibrate T0's
-
Establish CLC operating parameters (AS)
-
PMT gains
-
Thresholds
-
Gates
-
Gas pressure
-
Magnetic Field Test (MFT) (JK)