Run Planning Meeting Notes, Dec 5-Dec 11, 2018
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Wed, Dec 5 at 8:45
- Several items were fixed during a controlled access in the morning
- Amorphous radiator ladder by Hovanes and Scot
- Colin replaced a few bad FCAL bases
- Sasha checked one noising CompCal channel and found out that it was caused by the FADC baseline
- Sasha adjusted CCAL LED trigger time delay https://logbooks.jlab.org/entry/3635382
- Production trigger rate and CompCal rate study was performed by Sasha during afternoon and evening, https://logbooks.jlab.org/entry/3635399, https://logbooks.jlab.org/entry/3635391
- MCC plan for the coming week
- MCC will continuously deliver beam throughout the rest of week with 1.83 GeV/pass (10.3 GeV for Hall D).
- On Dec 9 (Monday), the beam will be off at 6:00am. MCC will change energy to 1.61 GeV/pass (9 GeV for hall D). This process is planned for three days (DeC 9-12).
- Jay Benesch has initiated a discussion with a group of experts to investigate the feasibility of monitoring 1-2 nA beam current for Hall D.
- Tagger scaler distribution shows that we have beam leakage from Hall C. https://logbooks.jlab.org/entry/3635351
- We have been taking Compton production data on LH2 target since midnight.
Wed, Dec 6 at 8:45
- Several items were fixed during a controlled access in the morning
- Change electronics for DAQ by Sasha
- Calibrate He level DP for solenoid magnet by Marc and Scott
- A few hours used to test newly updated DAQ by Sasha and Ben
- ~5 hours no beam from late afternoon to evening
- Colin and Josh adjusted FCAL high voltages for the inner four layers of counters based on the gain factors provided by Ilya.
- Analyzed data took the day before to study CompCal gain stability at different beam current up to 350nA on LH2. It looks stable for the counters close to beam hole.
- Found about 7 counters have non-lineraty vs energy (up to 8%). The rest of counters are linear.
- Started CompCal scan during owl shift with both LED trigger and CompCal trigger. TAC in data stream. DAQ in raw mode.
- Plan for today and weekkend:
- Finish CompCal performance study and take data on LH2 target and empty target data
Wed, Dec 10 at 8:45
- CompCal Calibration and performance study were completed at 11:30pm on Sat.
- Snake scan in raw mode
- energy and position resolution study
- Quick scan with TAC and CCAL triggers to study CompCal energy leakage and inefficiency in production mode
- Compton production data collection on LH2 target started at 12am and ended at 3:37pm on Sunday. A total of 752M events are collected.
- Started to empty the target cell at 3:38pm on Sunday and continued until 6:am on Monday. 201.5M empty target data is collected
- Issues:
- DAQ crashed several times
- DAQ error message for setting up random factor
- Online monitoring histograms are not updated on Sunday. it is working now.
- Be target installation is postponed in order to make sure that we have good quality LH2 data
- Plan for today:
- Remove vacuum pipe in front of CompCal
- Survey CompCal in beam position
- Install electronics for alpha source trigger.