RC meeting and Run Plan, Tuesday May 7th
Contents
RC Meeting Information
Current RC: Eric Fuchey
RC Daily Meetings are at 3:30 (pm) via Zoom and in person in the counting house meeting room (2nd floor)
- Zoom connection link: https://jlab-org.zoomgov.com/j/1616220064
- Meeting ID: 161 622 0064
Useful Links
Summary
Attempted to ramp up beam current to 12 uA on LD2 last night. GEMs behaved fine at first glance so we stayed there for the night.
There was a gas/fire alarm in Hall C SHMS gas hut which, by procedure, made MCC take beam away and evacuate counting house. Fortunately no damage to Hall C (besides time loss of 3 hours for them), but beam was unavailable for 1 hour.
We resumed production after, and run relatively smoothly until 6:30am. Then, GEM induced DAQ issues prevented us to take any data. We called for an escorted access to fix the issue: https://logbooks.jlab.org/entry/4298629 Production resumed at (10:50am) 11:40am.
It was determined by David that the increase of current from 10 to 12uA was not providing the expected gains in statistics - let alone the decrease in productivity due to DAQ issues. Therefore, we decided to resume data taking with 10 uA.
Planned Access to the Hall
Access Thursday:
- GEMs work:
- swap power supplies for currently non-working modules (e.g. rear GEM module 0)
- possibly, swap non-working APVs on rear GEM modules;
- Active analyzer:
- remove signals splitters and send full signal to ADC;
- adjust side polarimeter thresholds;
- ECal:
- get more channels in the ECal readout
Accelerator
Plan unchanged from yesterday:
- Hall C pass change + Wien angle change on Thursday;
- no Wien angle change next Tuesday for Hall A pass change;
- Accelerator beam studies currently scheduled on May 19th starting at 7am
Current Run Plan
Take data at 10 uA for production on LD2: BBCal threshold at -350 mV and HCal threshold at -10 mV for now. Once per shift, take a 1-hour run at 15 uA on LH2 with the production settings. See also Experiment run plans.
