Dear real photon group member,
I have placed an ASCII copy of the postscript file on my web page
(www.rpi.edu/~klusmm) as well as attaching a copy to this e-mail.
I hope this comes through okay...
Mike Klusman
--
Michael Edwin Klusman III
e-mail: klusmm@rpi.edu
phone: (518) 276 8403
fax: (518) 276 6680
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Hall B Pair Spectrometer: Commissioning Run Plan
Mike Klusman III
February 4, 1998
Jim Napolitano and I are requesting one-shift of beam time to accomplish checkout of the Pair Spectrometer.
1 Initial Checkout Before Beam
* Check PS scintillators for damage and new light-leaks
* Check HV card stability for PMTs
1. check phototube signals
* Check all connections from PMT bases
1. check signal cables from PMT base to electronics rack (LEVEL 2 on space frame)
* Check signal integrity from electronics rack (LEVEL 2 on space frame) to ADC and
TDC cards
1. check for broken connections at junction box of splitter (LEVEL 2 on space frame)
(a) Use a signal generator 2. check NIM/ECL Converter for broken inputs (LEVEL 1 on space frame) 3. check input connections of ADC splitter (LEVEL 1 on space frame) for broken
cable connections
* Discriminator Threshold should be between 50 and 100 mV (100 mV standard)
* Check Timing of PS for Trigger Supervisor
1. Adjust timing in Delay Generators for TS
* Collect ADC pedestals and TDC offsets (DAQ?)
* Check Target system
* Check dipole magnet
1. LCW checkout 2. Current trip limits properly set
1
2 Plateau of Counters with Beam
* Vary HV to plateau counters
1. -200 to +200 HV range around nominal voltage 2. high voltage steps of 50 V 3. interpret scalers (readout 0.1 Hz) (need Master OR)
3 Calibration
* Look at PS *TASC
* Look at efficiency of PS vs. Tagger
PS Triggers in beam
Map *
B vs. Trigger Rate of PS Find optimal field setting to operate PS Data selection of PS
L = left side (L1 - L4) OR'd R = right side (R1 - R4) OR'd
Full OR of PS (L *R) *1% of events PS (L *R) *Tagger (Master-OR and/or sections of focal plane) PS (L *R) *Tagger (Master-OR and/or sections of focal plane)
4 Time Allotment Estimation 4.1 Pre-beam checkout
Visual inspection of PS 15-30 minutes PMT signal checkout 30-60 minutes PMT signal cable checkout 60-90 minutes Check Hardware 30-60 minutes Collect Pedestals Check Timing 30-90 minutes & Check Target
Magnet Checkout *90 minutes
Estimate Time with safety factor (1.5) = 600 minutes (10 hours)
2
4.2 Plateau Curves
DAQ scaler readout *90 minutes Analysis of Plateaus 15-30 minutes
Estimated Time with safety factor (1.5) = 240 minutes (4 hours)
4.3 Calibration
PS trigger surveys *90 minutes PS vs.*
B map *60 minutes
Estimated Time with safety factor (1.5) = *240 minutes (4 hours) 5 Recommendations
* Pre-beam checkout can be accomplished before the Mid-March commissioning sched
ule. There exists a spare scintillator in case of problems. 300ns LEMO cables should be set aside. There may be a need to replace some cables from electronics between space frame levels.
* I estimate 1/2 shift for plateauing the PS counters.
* I estimate 1/2 shift for efficiency studies.
3
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