agenda
- hardware status
- calibration
- update on t0offset in embedding (continued discussion from last meeting)
- consequence of reduced HV on iTPC for 510 GeV pp in run 22

7.2 GeV FXT (2018) embedding  Yue Hang Leung LBL


        Aug 4, 2021 03:00 PM
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TPC meeting on Wedbesday 3.00pm

agenda
- hardware status
- operation
   failures, humidity, magnet current measure
- software
 - calibration status
- plans for shutdown (reminder)





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 agenda:
- operation
- calibration status
- FF field

Yuri posted additional slide on FF DCA_y
https://drupal.star.bnl.gov/STAR/system/files/OO200GeV2021RFvsFF_0.pdf


Tpc meeting June 9, 2021
Present: Gene, Yuri, Dan, Babu, Alexei, HongWei, Flemming

Hardware:
Humidity has been creeping up a bit. Yesterday some high current in fieldcage due to humidity.
Quote from Gene
“I find that the blower A/C being off on June 5th did raise the inner field cage currents during two physics runs:
22156024 and 026

I propose simply to mark these two runs as bad. I would advise in situations like this to stop the fill and address the blower ASAP rather than waiting for RHIC operators to reach their own end-of-fill.


The number of auto-recovery has gone up during the 3.985 GeV FXT . Beam is likely dirtier. Date for 24:s4 looks fine

Operation:
The ops crew noted alarm for magnet current at ops meeting. It seems to be correlated to the lower mean current observed the last day. This was observed earlier in the run by Yuri  see https://drupal.star.bnl.gov/STAR/blog/fisyak/averaged-star-magnet-current-table. The large oscillation is due to measurements  (+-2A)– this is understood. The drop today as well as drops earlier in the run is not. The oscillation gives a K0S mass change of ~0.4 GeV/c**2.
Yuri was asked to look at mean of K0S mass for the periods (or a period) where the mean is down to -4112 for average to identify if it is due to measurement or to change in magnetic field.
Alexei has earlier noted that for next year we should have a NMR installed with high precision field measurement.

Calibration:
At this point the TPC calibration are done for run-19.
Babu plans to have an update next week for the run-20 iterations.
Yuri had an additional plot of the FF local DCA_y  ivs. Sector number
https://drupal.star.bnl.gov/STAR/system/files/OO200GeV2021RFvsFF_0.pdf
The fits correspond to a rotation around the vertical axis of the field relative to TPC, and is of similar magnitude as the measured difference between field and TPC at zero-filed and incorporated in the ‘twist distortion correction. Yuri has discussed with Alexei and Bill C, to see if this can be  understood i.e why changing the field to result in such change.