Revision as of 07:27, 18 October 2021

Monday, October 18

1. Over the weekend:
   • Target emptied Friday 5pm - https://logbooks.jlab.org/entry/3925563
   • Long downtime started 5pm on Friday, beam came for an hour in the evening and was restored 6am Saturday.
   • Since then very productive: 1.25B events on empty target
   • Some noise in BCAL at 10 o'clock -
   • two-peak structure TDC's(of all detectors) - RF https://logbooks.jlab.org/entry/3926223 solved after restarting
   • TAGM TDC calibration problem - https://logbooks.jlab.org/entry/3926306 solved after several runs
   • NMR probe stop scanning https://logbooks.jlab.org/entry/3926647 https://logbooks.jlab.org/entry/3926650
   • last bleedthrough run taken with low pulser rate https://logbooks.jlab.org/entry/3925916
   • FDC wire thresholds optimized (lowered) - https://logbooks.jlab.org/entry/3925360
   • archiving trigger rate - solved by David https://logbooks.jlab.org/entry/3925225
2. Remaining issues:
   • tagger NMR not scanning
   • Bleedthrough
3. Plan:
   • 8am pass change - start filling the target
     • install the FDC chiller power switch - https://logbooks.jlab.org/entry/3925381
     • FCAL work
     • after beam comes - harp scans
   • plan for day/swing on Wednesday - maintenance
     • position survey CCAL - requires RadCon survey prior
     • install additional shielding at the left (downstream) PS arm
     • do measurements with magnetometer
     • ...

Friday, October 15

1. In last 24 hours:
   • power of infiniband switch tripped (one strip cord)- causing 4h UED -https://logbooks.jlab.org/entry/3924903 https://logbooks.jlab.org/entry/3925176
     • group disk not mounted https://logbooks.jlab.org/entry/3925185
     • trigger rate not archived https://logbooks.jlab.org/entry/3925225
   • FDC chiller replaced https://logbooks.jlab.org/entry/3924510
   • beacon bulb replaced - took 2h
   • FDC hot wires https://logbooks.jlab.org/entry/3924538 - no more noise but higher discr. thresholds (need 30 min to optimize the thresholds)
   • 6h downtime - NL cold box + other things
   • harp scans - https://logbooks.jlab.org/entry/3924829 https://logbooks.jlab.org/entry/3924830 https://logbooks.jlab.org/entry/3924845 https://logbooks.jlab.org/entry/3924851
   • ~400M triggers for the last 24h
   • pulser left at 2kHz after the downtime https://logbooks.jlab.org/entry/3924927 - all data after that till 23:30 with 2kHz pulser - don't forget to restore pulser to 100Hz once you are done with your test
   • more rootspy nodes https://logbooks.jlab.org/entry/3924610 (David)
2. Remaining issues:
   • fix remaining problems on gluon machines (trigger rate not archived https://logbooks.jlab.org/entry/3925225)
   • Bleedthrough
3. Plan:
   • run till 5pm with full target, then with empty over the weekend - inform target group (Chris) when emptying/filling the target
   • pass change on Monday
   • day/swing on Wednesday - maintenance

Thursday, October 14

1. In last 24 hours:
   • FDC chiller tripped due to overheating - no chilled water flow: https://logbooks.jlab.org/entry/3923962
   • Could not do rapid access - beacon bulb burned out - https://logbooks.jlab.org/entry/3924326 (lost about 40 min)
   • Early riser summary: https://logbooks.jlab.org/entry/3924292
   • Owl summary: https://logbooks.jlab.org/entry/3923921
   • Swing summary: https://logbooks.jlab.org/entry/3923728
   • Day summary: https://logbooks.jlab.org/entry/3923480
   • ~400M triggers with B-field LHe 200nA + 300M without FDC
   • short downtime (~30 min) HallA BLA calibration
   • Run 81504 in raw mode
   • Run 81505 ~40min no D laser, B,C up, A down, last minute with the D laser.
   • PS background https://logbooks.jlab.org/entry/3923621 (Sasha)
   • spike in beam current https://logbooks.jlab.org/entry/3923798
2. Remaining issues:
   • fixed the beacon and the FDC chiller
   • noisy FDC wires https://logbooks.jlab.org/entry/3923747
   • Bleedthrough
3. Plan:
   • 2 more shifts with 200 nA and target filled with He then wait for decision from Primex 4 pm meeting.