RC meeting and Run Plan, Wednesday May 1st
Contents
RC Meeting Information
Current RC: Iuliia Skorodumina
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
We were taking data overnight without major issues. We ran at 10 uA on LD2 and 15 uA on LH2 (one run per shift) with BBCal threshold set to -350 mV and HCal threshold set to -10 mV.
Today is a Maintenance Day. See https://logbooks.jlab.org/entry/4293542 for the planned accelerator work. Beam studies are also possible today. According to the current plan, beam in the machine is expected in early Swing and beam restoration to the Halls in mid Swing.
Hall A is in Restricted access now. We plan to stay in Restricted access towards the end of Day shift. A lot of work is planned in the Hall today.
Day shift summary (https://logbooks.jlab.org/entry/4292778).
Swing shift summary (https://logbooks.jlab.org/entry/4293086).
Owl shift summary (https://logbooks.jlab.org/entry/4293382).
We will have our daily 3:30 pm RC meeting on the 2nd floor of the counting house and on zoom.
Planned Access to the Hall
On Wednesday (05/01) we plan to put the Hall in Restricted access during the Maintenance day. This is to bring in a large enclosure for the ECal for doing some cosmic test (Jimmy Caylor, Simona, and Donald) and also to bring out some material to be used in making the Gep SBS GEM detector.
Other work planned in the Hall for Wednesday (05/01):
- GEM work (Holly).
- Hodoscope discriminator replacement + amplifier installation + magnet shielding installation (Bill Henry).
- Heidi wants to go to the Hall.
Accelerator
- Today (05/01) is a Maintenance day. See https://logbooks.jlab.org/entry/4293542 for planned accelerator work. Beam studies are also possible today. According to the current plan, beam in the machine is expected in early Swing and beam restoration to the Halls in mid Swing.
Current Run Plan
We did a few tests over the weekend to better understand changes in the inclusive elastic yield depending on the BBCal and HCal thresholds. Based on these studies, we set the BBCal threshold at -350 mV and HCal threshold at -10 mV for now. The beam current is 10 uA for production on LD2.
We also need to take a 1-hour run on LH2 with the production settings once per shift at 15 uA.
- Thursday (04/25) HCal threshold studies (https://logbooks.jlab.org/entry/4288910).
- Friday (04/26) BB singles (https://logbooks.jlab.org/entry/4289712). See Andrew Puckett's study (https://logbooks.jlab.org/entry/4290174).
- Saturday (04/27) BBCal threshold test (see https://logbooks.jlab.org/entry/4290231 and https://logbooks.jlab.org/entry/4290326). See Andrew Puckett's study (https://logbooks.jlab.org/entry/4290654).
See also Experiment run plans.
Current Issues
- Holly was adjusting GEMs high voltages yesterdays evening (04/29) in order to increase their efficiency (see e.g. https://logbooks.jlab.org/entry/4292205, https://logbooks.jlab.org/entry/4292265, and https://logbooks.jlab.org/entry/4292360).
- On Monday (04/29) Bill Henry updated the pedestals for the FADCs in the grinch crate for the rp hodoscope and the active analyzer (https://logbooks.jlab.org/entry/4292011). He also noticed an issue with some hodoscope channels which may point to a bad discriminator (https://logbooks.jlab.org/entry/4292037).
- On Sunday (04/28) downstairs HallA air monitoring alarm started alarming (ODH alarm). This does not affect the beam delivery and RadCon plans to look into it on Monday (https://logbooks.jlab.org/entry/4290926). --> Fixed (see https://logbooks.jlab.org/entry/4292130).
- On Saturday (04/27) Bill Henry turned off a few pmts in the active analyzer because they were noisy (see https://logbooks.jlab.org/entry/4290526 and https://logbooks.jlab.org/entry/4290718). He continued working on this on Sunday, too (https://logbooks.jlab.org/entry/4291061).
- On Fri Swing and Sat Owl Vimukthi and the GEM group adjusted high voltages for three SBS GEM modules. This was done with the intention of increasing the efficiency of those modules (https://logbooks.jlab.org/entry/4289667 and https://logbooks.jlab.org/entry/4290293).
Future plans
- Today (05/01) is a Maintenance day. See https://logbooks.jlab.org/entry/4293542 for planned accelerator work.
- On Wednesday (05/01) we plan to put the Hall in Restricted access during the Maintenance day. This is to bring in a large enclosure for the ECal for doing some cosmic test (Jimmy Caylor, Simona, and Donald) and also to bring out some material to be used in making the Gep SBS GEM detector. There will be other work done in the hall, too (Holly, Bill Henry, Heidi).
- MCC does not plan any major beam changes up until May 14th.
