Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

Present: Alexei, Flemming, Tommy, Yuri, Gene, David, and myself

== Hardware

— water leak at blower

— problem with cathode HV supply

— discussed with sPHENIX

— Alexei investigating and getting quote for power supply

— long delay in production (~20 weeks)

— looking into use of alternative PS from test stand

— some concern about absence of good laser runs

— were not taken due to water leaks in magnet cooling system (under repair currently)

— expect will be better laser runs soon 

== Electronics

— good progress

— TPX FPGA code is mostly done

— about 3 RDOs done in sector 1, started moving through sector 2

— may be some issue with timing 

— but new code is running on a number of RDOs in system

— online plots are filling correctly

— hope to test much larger part of system next week

== Software

— Gene noted the volume of zero field data and its utility in calibrations and alignment

— discussed work with Temple 

— students Charlie Clark, Richard Chruchley will be working

— SC for run 23, usually done by HLT group, new person this year, Baoshan

— Gene putting Baoshan in touch with Babu

— all 2019 and 2020 FXT runs done for dE/dx calibration 

— Yuri working on dE/dx FXT 2019 and 2020

— FF vs RFF for 2021 is still a puzzle since no TPC movement has been detected

— O+O and 7.7 Au+Au were taken with FF

— other data after RFF change do not show same distortion

— 1 mrad TPC roatation shown by survey, but Yuri does not see that in his work

— only for 2021 FF does TPC appear to be rotated

— old survey position works before and after that period

— Irakli increased statistics by factor ~5

— Yuri working on combined PID in O+O data

— now trying to understand ToF

— want to better understand how ToF resolution is calculated

— Yuri looking into RDO activity map

— 2020 and 2021 data

— need confirmation from 2 independent experts 

— currently only have one such expert

— expect strong effect on embedding for 2020/21

— New cluster finder 

— after FPGA work is done, need to check what is produced offline and online (compare)

— expecting new drift velocity today

— Alexei says can check data from last night and this morning for new drift velocity

== AOB

— Request from Frank to present status of several TPC topics in next week’s S&C meeting

— Richard will call to discuss with Frank and update the group

— Yuri also need some help from Tommy to run over as much data as possible from previous years for FF and RFF comparison 

— years all the way back to 2013, etc.

— want to understand if the problem seen in O+O can be found in earlier data

Best Regards,

  Richard

Sent from my iPad

-- 
"Education is the most powerful weapon which you can use to change
the world."

--Nelson Mandela

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 Richard Witt, Professor of Physics     Phone (USNA): 410-293-6675
    United States Naval Academy         Email: witt AT usna.edu
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