Revision as of 07:55, 2 July 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

Saturday July 2

Past 24 hours

• beam taken away by MCC around 10am for beam studies and high current development to hallC
• Access to hall by Tim to move Pb target slightly off center to position frame in beam. Taking data in this configuration was abandoned since there will be no beam still swing shift. Ilya went back to the hall and put the Pb target back into nominal position
• postpone the target "off-position" test to a later time with more beam reliability.
• around 4:20pm beam is back, first do harp scans and the proceed with production data taking on Pb target.
• taking data was generally ok with the intermittend issue of beam trips and persistent DAQ buffer issues.
• shift crew uses "Buffer Depth" indicator of the DAQ to take action on stoping/restarting a run to battle lifetime issues.
• DAQ life time during owl shift is generally good

Shift reports

• day shift summary
• swing shift summary
• owl shift summary
• early riser shift summary

Reports

• The accidental scaling factor for run 100767 is around 1.08 which is somewhat higher than during regular GlueX running but comparable to PrimeX running.

Issues

• Request to any target movement/change: Report the change in the logbook with a picture of the "flag"-target-indicator and beam line
• the NMR probe for the TAGGER magnet is operational again providing reasonable data.

Plans

Friday July 1

Overall a similar day as in the past: no beam during the day with some data taking over night. Generally the beam looked more stable but still lots of trips when HallC beam is on. (Beam in HallD and C).

Past 24 hours

• start out with no beam. Beam lost due to 1L15. whole day shift needed to replace "braker" for zone 1L15
• after accelerator repair work, efforts are taken to establish beam in the machine and try to increase beam current for HallC
• Bobby and Ilya entered to hall to investigate the target moving mechanism.
• Justin rebooted crate U1-1-top to reestablish BCAL LED trigger
• the magnetic field measurement of the tagger magnet is still not working. See earlier report
• beam back after 10pm started doing harp scan first: Harp Scan Results
• shift crew was not able to write halld scan pictures into logbook: see owl shift summary
• take first data with Amo radiator on goniometer and then production with diamond. pretty much very time a runs was restarred the life time was bad and the DAQ required full restart.
• the beam position on the AC may be more stable in then in the past: requires closer look
• the DAQ liftime keeps posing issues: DAQ lifetime monitoring
• from Epics Overview all looks ok, the rates in the very low tagger enegery counters are low, but the scale of the high rates counters dominates the plot. But maybe the rates in those counter may in fact be dominated by scraping? -> needs closer look see also report from Hovanes on harp scans
• Beam positions at AC seem to be more stable and variations smaller than in the past: beam positions in halld

Shift reports

• day shift summary
• swing shift summary
• owl shift summary
• early riser shift summary

Reports

• low invariant mass +/- pair tracks are indeed leptons: E/p vs Mass (and mostly electron/positrons!)
• Monitoring proposal for CPP signal: [1]
• target position mechanism and small variations:
  
• BCAL Gain studies over the current run period by M.D. For most sensors these look reasonable. Some outlier due to hardware changes.

Issues

• tagger NMR probe not operational,TAGGER NMR. The magnet itself is controlled by MCC
• DAQ issues with low life time seems to happen more frequently affecting almost every stop/start run action. The lifetime drop seems to happen mostly when starting a new run, not so much during a run (my interpretation from the logbook).
• Two pre-amp cards in the CDC may have developed more noise

Plans

• maximum 2 hour beam test with target in "wrong" position to assess the issue of different DAQ/count rates after the TAC run period
• TDB longer term schedule for the whole of the long week end
  • take 12 hours (calendar time) "empty" target data nested between "full" target data taking over the course of the long week end

Thursday June 30

Past 24 hours

Overarching theme of the past 24 hours: "herding cats"

• no beam during the day, machine optimization to deliver high current beam to HallC (unsuccessful)
• beam back around 5:30pm
• did first two Harp scans with HallD laser on and off while hallC had around 17uA of beam
  • Scan One with our beam
  • Scan Two only HallC beam
  • Scan results at collimator
  • peak to base line of the harp peaks is about 100 (as in previous scans)
  • OLD harp scan from Dec 1 2021 and Dec 2 2021
• general beam conditions are rather unstable. beam strip chart
• continue data taking over night
• DAQ issues again with life time dropping to 60%. Shift crew called Sergey.
  • found problem with Slot 3 fiber 7 having trouble (I think this is seen in roctrig1?)
  • after Sergey's intervention DAQ came slowly back to "normal"
• beam conditions are very unstable over night
• Loss of NMR comm in Tagger Manet
• again very bad life time 10% only! (stopped run 100778) but also beam lost beam at the same time.
  • stopping and restarting the DAQ with new run 100779 cured the issue of low lifetime, but soon beam was lost again.
• beam on and off for some time, finally off with problems in several cavities one whole (1L15) zone no beam for several hours.

Shift reports

• day shift summary
• swing shift summary
• owl shift summary
• early riser shift summary

Reports

• invariant mass of pi+pi- tracks: Vertex VS M(pi+pi-)
  • follow up Energy, Trigger Bit

Issues

• HallD beam conditions(e,gamma): quality/stability
  • Tuned beam and CW beam to hallD looks different ELOG entry
• HallC beam high current not reached, current reached 30uA

Plans

• MCC: Machine needs to replace "breaker" in 1L15
  • last time this work took about 6 hours
  • NL and SL to be taken down
  • take this opportunity to assess relocation of some BLM in the machine
• expect beam no earlier then swing shift.
• CPP/NPP: TBD
  • first do harp scans when beam comes back
  • do first an Amo run using goniometer Al radiator if that does not work due to ion chamber try target ladder Al radiator.
  • continue nominal production data taking on diamond.