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["Fisyak, Yuri V" <fisyak AT bnl.gov>]

        Hello, I have checked new dE/dx calibration sample for RunXIX-XX FXT.

I see that the calibration sample for 3p85GeV_fixedTarget_2019 has to be increase by a factor of 20 to provide a reliable dE/dx calibration.

 

 

13p5GeV_fixedTarget_2020      : No. of Prinmary Vertices =    0.34298M, Good =    0.34298M,     No. positve tracks =     13.079M,       negative tracks =     7.0701M

19p5GeV_fixedTarget_2020      : No. of Prinmary Vertices =     0.3622M, Good =     0.3622M,     No. positve tracks =     14.105M,       negative tracks =     8.3027M

26p5GeV_fixedTarget_2020      : No. of Prinmary Vertices =    0.37886M, Good =    0.37886M,     No. positve tracks =     14.277M,       negative tracks =     8.8486M

31GeV_fixedTarget_2019        : No. of Prinmary Vertices =    0.31423M, Good =    0.31423M,     No. positve tracks =     11.891M,       negative tracks =     7.4593M

31p2GeV_fixedTarget_2020      : No. of Prinmary Vertices =    0.43853M, Good =    0.43853M,     No. positve tracks =     16.939M,       negative tracks =     10.678M

 

3p85GeV_fixedTarget_2019      : No. of Prinmary Vertices =   0.048554M, Good =   0.048554M,     No. positve tracks =     1.7863M,       negative tracks =    0.45417M <<<<<<<<<<<

 

4p59GeV_fixedTarget_2019      : No. of Prinmary Vertices =    0.93338M, Good =    0.93338M,     No. positve tracks =     37.116M,       negative tracks =     11.387M

5p75GeV_fixedTarget_2020      : No. of Prinmary Vertices =    0.47772M, Good =    0.47772M,     No. positve tracks =     14.857M,       negative tracks =     5.4902M

7.3GeV_fixedTarget_2019       : No. of Prinmary Vertices =    0.38862M, Good =    0.38862M,     No. positve tracks =     14.227M,       negative tracks =     6.0581M

7p3GeV_fixedTarget_2020       : No. of Prinmary Vertices =    0.42879M, Good =    0.42879M,     No. positve tracks =     16.363M,       negative tracks =     6.9606M

9p8GeV_fixedTarget_2020       : No. of Prinmary Vertices =    0.60542M, Good =    0.60542M,     No. positve tracks =     23.333M,       negative tracks =      11.36M

                                                              Yuri Fisyak

STAR                                           Phone: +1 631 344 3913
Brookhaven National Laboratory  Fax:    +1 631 344 4206
510A/1-161
http://www.star.bnl.gov/~fisyak       E-mail: fisyak AT bnl.gov

 

 

 

From: Star-tpc-l <star-tpc-l-bounces AT lists.bnl.gov> on behalf of Richard Witt via Star-tpc-l <star-tpc-l AT lists.bnl.gov>
Date: Thursday, June 15, 2023 at 12:43 PM
To: Star-tpc L <Star-tpc-l AT lists.bnl.gov>
Subject: [Star-tpc-l] TPC Meeting Minutes

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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