Star-tpc-l mailing list

[videbaek <videbaek AT bnl.gov>]

Minute TPC meeting June 22, 2023
Present:
Jim, gene, alexei, tommy, flemming, yuri

Hardware
--quote for cathode  is been requested for 6okV  60 kV supply , 14k$ and 
lead time 28 weeks.
This is what Tom Hemmick is using for sPHENIX, and Alexei decided to 
pick the same after discussion with Tom.
- gas impurity showed again with the most recent exchange of 6-pack and 
the vDrift is down to
What happened with the first of new supplier.
Methan left for 12 days. Note after meeting. Prahsanth said 
today(Friday) that he expects delivery today of 2 six-packs
-Could be possible have a sample bottle, and check composition gas 
tomography e.g. in Chemistry? (FV). Alexei will follow up

Electronics –
3 more sectors 4-6 now  with daq5k . Some readout issue with adc’s for 
sector 4-1, clusters ok

Software
- pull requests that has been stalled (some of Yuri’s) have been 
approved

 finished up calibration fixed target dataset. Looks good. Will need a 
couple of more days  for checking. Should be done by Monday.
The 19.6 is in database. Gene will start production. 7.7 needs update 
due to minor update (a few % correction)

Working on combined PID.

Yuri had asked Tommy to look at the production data for RFF and FF 
production data full field data going back to 2010 and look at the 
quantity
“dY in SCS versus sector and Z zx projection”.
Summary plots as well as summary table shows clear modulation for FF 
data are in in https://www.star.bnl.gov/~ctsang/Alignment/dYS/
Tommy’s table summarizing this is in
https://www.star.bnl.gov/~ctsang/Alignment/dYS/summary.html


The summary from Tommy is:
Signification sinusoidal modulation in cluster – tracks vs sector is 
only found in Full field results on 2021. It is not seen in Reversed 
full field or old full field results. Therefore a special rotation 
should be applied to FF data on 2021.


Recall that this was  not supported by Alexei measurements. Suggest to 
introduced rotation for run 21.




--
Flemming Videbaek
senior scientist, emeritus
videbaek @ bnl.gov
Brookhaven National Lab
Physics Department
Bldg 510D
Upton, NY 11973

phone: 631-344-4106
cell     :  631-681-1596