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Date: Mon Nov 26 00:33:44 2001, Shift: 16:00-24:00
Supervisor: JH Lee, with: James Norris
Log book#11 pages 39 - 42
Shift Summary:
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1. Beam:
~5 hours of beam at injection energy(10GeV+10GeV)
New stores in every 1.5 hour
2. Settings
- MRS at 90 FS at 12 degree
- TPM1,TPM2,T1,T2 on T3,T4,T5 off
- Trigger used for the low enery runs:
Trigger 1, 2 (BB LR>=1), 4 with no scale down
- Trigger Overlap:
Please see
http://pii3.brahms.bnl.gov/~jhlee/brahms/trigger_overlap_5997.gif
for the trigger overlap. It seems like that Trigger 4 is having
trouble to identifying central events, which is not a surprise.
3. Physics Data Taken:
Run 5997 - 6005: ~110K trigger 2 (~30K events has TPC HV at 900V)
4. Rates:
Here are some rates for the low energy runs.
One sequence data file
[A typical store gives ~1.5 sequence data file, which
takes about 50 minutes.
(~20-30 minutes between the stored/cogged)]
gives
~15K trigger 1
~24K trigger 2
~57K trigger 4
which results
~1100 TPM1 tracks
~150 MRS tracks
at 90 degree.
If we have 10 to 15 good stores, we probably will have
1100*1.5*(10 to 15) = 17K - 25K TPM1 tracks
150*1.5*(10 to 15) = 2.3K - 3.4K MRS tracks
5. No new detector problems seen
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