Revision as of 08:53, 20 June 2022

↑ Back to Run Coordination Meetings:Summer2022

Meeting are via ZoomGov: connect (Meeting ID: 160 199 0060 / Passcode 8394)

MCC whiteboard

Hall D counting room white board

Spreadsheet with list of runs

Monday June 20

1. Last 24h:
   • CTOF trigger time adjusted
   • TOF signal size. To compare with 400 threshold.
   • Changes to AC locks. Need to evaluate the impact. [1]
   • Beam returned at 8:30 pm. Smooth production since then.
2. Reports
   • Lack of TDC hits for CTOF
   • New diamond spot analysis tool available
3. Issues
   • Beam position is unstable
   • DAQ live time fluctuations. [2] Tagger access tuesday to look at this.
   • 24 tagger channels off. Tagger access tuesday to look at this.
4. Plans
   • RF recovery Tuesday and machine tuning for Hall C high current.
     • Change F1TDCs in Tagger that may be causing live time issues.
     • Install helicity fibers in Tagger
     • Change HV crate in tagger that is causing issues.
   • Accelerator maintenance day Thursday
5. Commissioning steps temporarily postponed:
   • Flux optimization/Act .Col. calibration
   • PS and TAGH HV scans
   • Bleed-through test: measure bleed-through with A slit as usual and A slit completely closed to see whether using B slit would help.

Sunday June 19

1. Last 24h:
   • TOF trigger included in data stream. Total rate 60kHz, 400 Mpbs, ~97% live time. CTOF prescale factor 5
   • Beam profiler was inserted to study position with redundant monitors. Beam position is unstable
   • Smooth running overnight. Coherent peak shape and energy looks good.
2. Reports
   • From PD-RC 8:45 meeting.
     • Jay will look into our beam stability issues.
   • Trigger timing
   • New diamond spot analysis tool available
3. Issues
   • Beam position is unstable
   • DAQ live time dropped twice. [3][4]
   • 24 tagger channels off.
4. Plans
   • Flux optimization/Act .Col. calibration
   • RF recovery Tuesday
   • Accelerator maintenance day Thursday
5. Commissioning steps temporarily postponed:
   • PS and TAGH HV scans
   • Bleed-through test: measure bleed-through with A slit as usual and A slit completely closed to see whether using B slit would help.

Saturday June 18

1. Last 24h:
   • Live time now being written to epics archiver.
   • Downstream beam pipe was moved. Opportunistic.
   • Tagger NMR lost lock
   • Sasha addeed TOF to triggerRates were very high. Pre-scale by 2 and thresholds raised but timing not complete yet.
   • Hovanes attempted AC scan but beam was not locking
   • Ran quasi production for NPP and maybe CPP.
2. Reports
   • From PD-RC 8:45 meeting.
     • Generally everyone is somewhat unhappy. :-(
   • CPP dEdx issues. CDC is likely fine. Its gain and hit efficiency (hits found/hits measured) are normal. But tracking is missing the start counter, & the target isn't in the usual spot.
3. Issues
   • 24 tagger channels off.
4. Plans
   • Flux optimization/Act .Col. calibration
   • Trigger development for TOF trigger
   • RF recovery Tuesday
   • Accelerator maintenance day Thursday
5. Commissioning steps temporarily postponed:
   • PS and TAGH HV scans
   • Bleed-through test: measure bleed-through with A slit as usual and A slit completely closed to see whether using B slit would help.

Friday June 17

1. Last 24h:
   • Tagger voltage alarms
     • Nick changed card and slot again. Same issue. He set the max voltage to 1100 V so an overvoltage is less serious. The next step is to change the crate which would take a shift and need 2 people.
     • Hovanes turned counters off
   • Beam returned at 11 pm.
   • Harp scans performed [5][6][7]
   • Beam envelope looks good Accelerator have asked us to put these projections in the elog in future.
   • No CH edge observed. Hovanes helped to get diamond aligned overnight. [8]
   • Ran quasi production for NPP. Pressure change CDC alarm twice.
2. Reports
   • From PD-RC 7:45 meeting.
     • Hall C not getting high current, more work is needed
     • Hall B will need a spin dance
   • Low rates in TOF [9] and low current in CDC [10]
   • Spreadsheet with list of runs
3. Issues
   • 24 tagger channels off
4. Plans
   • Flux optimization/Act .Col. calibration
   • Trigger development for TOF trigger
   • RF recovery Tuesday
   • Accelerator maintenance day Thursday
5. Commissioning steps temporarily postponed:
   • PS and TAGH HV scans
   • Bleed-through test: measure bleed-through with A slit as usual and A slit completely closed to see whether using B slit would help.

Thursday June 16

1. Last 24h:
   • No beam since last meeting
   • Still getting tagger voltage alarms (should we just turn those counters off?)
2. Reports
   • From PD-RC 7:45 meeting.
     • Beam will be gone until Swing Shift at least
   • Spreadsheet with list of runs
3. Issues
   • High trigger rate in CTOF
     • MWPC #6 window cover removed. If successful, great. Otherwise, attempt to move helium bag downstream.
4. Plans:
5. Upcoming Items:
   • PS and TAGH HV scans
   • Bleed-through test: measure bleed-through with A slit as usual and A slit completely closed to see whether using B slit would help.
   • Tagger Access:
     • Change HV crate (Nick, Chris)
     • Install helicity fibers and connect to DAQ