Revision as of 08:13, 13 June 2022

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

MCC whiteboard

Hall D counting room white board

Sunday June 12

1. Last 24h:
   • 8:20am-11:20am: DAQ problem (running at very low rate). Sergey investigated and fixed the issue.

   noon-2:40pm: Beam down (big thunderstorm over Newportnews).

   • Took about 2.5h of data on "empty target" (less than the planned 4h because of above problems).
   • 6:15pm-9:15pm: Beam down for Hall D due to some Hall C beam delivery issue that needed injector diagnostics. -> it became too late for L1 study. We postponed it to tomorrow morning.
   • 6:20pm Access to switch back to Pb target.
   • 30min run by Lubomir, with trigger without bit-6 to diagnose FDC occupancy problem.
   • Short raw mode run by Beni to diagnose CToF problem.
   • 10pm-midnight: CToF HV scans.
   • "Production" on Pb target overnight (60nA).
   • 5:30am-7:30am Beam down due to vacuum issue.
   • 7:30: Starting microscope HV scan.
2. Reports
   • From PD-RC 7:45 meeting.
     • This Sunday, there was much less beam trips. Due in part from Hall C not running. Friday/Saturday, Hall D beam was also responsible for a large part of MPS trips but not anymore (nobody knows why this changed, yet). Ops at a loss to what is the Hall C/Hall D beam problem. PD asked injector people to look at their set-up. 3h access planned for this Monday morning.
     • Hall C will be down today to fix their spectrometer. Good opportunity for diamond alignment?
     • No news on why locks are not keeping the beam position on profiler/collimator.
   • Report on Saturday's L1 trigger work.
   • current FP triggers enabled
   • microscope HV scan.
   • What to do in case of CDC pressure alarm. This was added to [ https://halldweb.jlab.org/hdops/wiki/index.php/Central_Drift_Chamber_Shift#Pressure_alarm_on_HD:coda:cdc:p_diff CDC shift instructions]
3. Issues
   • Tagger HV alarms
   • fADC, TDC time shift
   • Double peaks in timing distributions, but Sean says to not worry just yet.
   • NMR probe for tagger magnet not locking
   • (old) beam lock not working on the profiler.
   • (old) FDC not showing any hits at strips 0-40,160-200
   • (old) data not saving to cache right away
4. Plans
   • microscope HV scan, if the beam comes back before 9am
   • Beam will be down for 3h (until noon?) for injector diagnostic to fix beam trip problems.
   • Diamond alignment if beam quality is like yesterday (Hall C will be down today)?
   • L1 trigger work?
   • ...
5. Commissioning steps temporarily postponed:
   • microscope HV scan (Monday?)
   • optimize photon beam transmission
   • Ion Chamber calibration on diamond
   • PS and TAGH HV scans

Saturday June 11

1. Last 24h:
   • 8:40am: Finished ToF, (CToF) and CDC HV scans.
   • 8:45-12:50: Beam down due to injector issue.
   • Beam convergence after beam down time looks good
   • Did 15 min raw mode run 100 nA, Amo 3E-4 RL and using the configuration file Sergei prepared in the morning (part of detector checkout).
   • Attempt to optimize photon beam transmission. Aborted because beam position could not ne locked on the profiler.
   • L1 trigger set-up.
   • 20min raw mode run (Asked for by Beni to understand the CTOF rates / threshold settings)
   • Overnight: production on Amo 3E-4RL and Pb target, with improved trigger. (high rates in the CTOF => low lifetime ~50%, with beam current limited to 60 nA).
   • 5:30am-8:20am beam down due to power supply issue.
   • While te beam is down, access to switch from Pb target to "empty" target.
2. Reports
   • run_go and run_end scripts modified to set HD:coda:daq:cdc_used
   • raw run 100407
3. Issues
   • beam lock not working on the profiler.
   • Camera is not looking at the target
   • FDC not showing any hits at strips 0-40,160-200
   • data not saving to cache right away
   • CDC occupancy. CDC hole is expected because some of the CDC electronics is used in the muon chambers.
4. Plans
   • 4h data taking on empty target. Then, short access (Rory) to put back the Pb target.
   • 20 min run on production mode, but without trigger bit 6. (Lubomir)
   • L1 trigger work (A. Somov)
   • Short raw mode run (Beni)
   • CToF HV scan (Beni)
   • Production on Pb target overnight.
5. Commissioning steps temporarily postponed:
   • microscope HV scan (Monday?)
   • CToF HV scan
   • Ion Chamber calibration on diamond
   • PS and TAGH HV scans

Friday June 10

1. Last 24h:
   • Beam was down for about 10h (~9am-7pm) due to RF zone problem and then electrical panel breaker work.
   • Short Hall access by Nick Sandoval.
   • When beam came back, Harp scans showed that beam convergence was good enough for the next runplan steps:
     • A. Somov did some preliminary L1 trigger studies. Was not able initially to run at the desired 100nA. Could not run in raw mode.
     • Detector calibration. Did the 1h production mode run (at 60nA instead of 100nA), but the 15min raw mode run was postponed (see above).
     • Beni did his ToF and CToF HV scans. Was able to do it at 100nA. CToF HV will need to be redone.
     • Beni/Night/morning shift crews did CDC HV scan, following instructions written by Naomi.
2. Reports
   • Argon tanks is empty, and one of the alcohol bubblers is at the ADD line.
   • HALO Scan Background
   • Initial DAQ config for CPP
   • Initial timing calibrations from this run
   • HV Scan for CDC,TOF and CTOF, CDC currents are low, timing of CTOF ADCs.
   • Tagger channels with no signal
   • Online monitoring reference plots and suggested updates
3. Plans
   • Check beam convergence.
   • Do a 15min raw mode run with the configuration file prepared by Sergei.
   • Finalize GlueX+CToF trigger. Fix problem with raw mode running. Preliminary look at CPP/NPP trigger
   • If Sacha has time: do the PS/TAGH HV scan.
   • Take 1h run with the new trigger setup. (If it is late in the evening, make this overnight runs)
   • If it is not too late in the evening: Optimize beam transmission and Act. col. calibration.
   • Overnight runs with the new trigger setup.

Thursday June 9

1. Last 24h:
   • Ion Chamber calibration (had to be redone this morning as OPS found the one done yesterday suspicious).
   • Radiation levels checks done (levels, according to our CARMS, are very good).
   • Radiation levels scans with current (50nA, 75nA, 100nA)and RL (0, 1E-4, 3E-4) done. Need to be analyzed.
   • Microscope HV scan postponed to Monday. (Microscope can still be used.)
   • Most of the time was spend on tuning beam and doing harp scans (5C11, 5C11b, ours). Beam was not good, with bad convergence/divergence and showing significant background. May have been improved during the night (needs to be checked).
   • Act. Col. operational.
2. Reports
   • MCC does not see a double beam in Hall C at high CW beam current. But still sees it in other part of the machine. Currently, no more plan to stop the accelerator to fix this.
   • Our beam current lock is not working. Shift crew to watch for beam current drift.
   • Malte accessed the Hall to change FCal bases
   • First scan with new harp. Later scan. Large background. Bad convergence.
   • beam convergence (early afternoon), beam convergence (late afternoon)
   • Act. Co. gui needs to be updated.
   • Richard new harp fitting tool
   • Report on Act. Col.
3. Plans
   • Check photon beam quality (Hovanes, already started around 8am.)
   • Do L1(GlueX)/DAQ/detector checkout and take a bit of data?
   • Align diamond during the day? (Might not be the best time: Hall C is expecting to finish its access around 9:30. Then MCC will resume high current tune to Hall C).
   • Accelerator may be down for ~2h today to bring back a RF cavity. No firm plan yet.
   • Do ToF/CToF/CDC HV scans in the evening?

Wednesday June 8

1. Last 24h:
   • Ops is tuning the beam and asked Hall D to be ready by 11am-noon for physics beam. We restored shift starting at noon. But beam is coming only just now (7am-8am, Thursday 9th). Doing Ion Chamber calibration
     • Lost a few hours because of repair work done on a fan dropped a zone (miscommunication with Facility).
     • Struggled to tune Hall C and this put Hall D tune on backburner. Wasted 8-10h (whole night) trying to tune Hall C with two magnets off, which is not possible. DC power group is e-assessing their HCO procedure.
     • One of the quadrupole (MQP5C09) on Hall D line tripped on overtemperature. Probably due to clogged cooling line. Needed to investigate so brought down North Linac and ramped down our tagger magnet. This quad. is now off and will (tentatively) be repaired at next maintenance day. CASA devised a tune for us that does not use this quads.
   • Yesterday MCC safety minute: The PD saw a water mocassin eating a bullfrog in his pound => watch for snakes.
2. Reports
   • A. Somov replaced two boards during late afternoon (rapid access).
   • If you need access, put your name on Hall D white board (access list) and let RC know.
3. Issues
   • Maybe problem with 2-spot beam (two beams differing in energy by 10^-3). Not clear if this is present with CW beam. If it is, fixinf this may delay the program: fixing this is of the highest priority for Ops.
   • While walking to MCC yesterday (Wed. June 8th) afternoon, I passed a snake that was basking in the sidewalk gutter => watch for snakes.
4. Plans
   • Ops still have some work to do: Establish high current in Hall C. Start Hall B (tomorrow?).
   • Assess beam quality, optimize beam transmission, checkout/calibrate systems.