Back to Run Coordination Meetings:Summer2022

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

Friday July 1

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

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.

Thursday June 30

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.

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

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

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.