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

07/06/2023 TPC meeting minutes:

Attendees: Jim, Yuri,  Tommy

Tommy:

1. https://www.star.bnl.gov/~ctsang/Alignment/dYS/summarydTZ.html is dZ (cm) and dT(μsec) between Z of primary vertices reconstructed in the same event from track only from West part of TPC and only from East part of TPC for multiple datasets obtained In 2005-2021.

1. The distributions with σ_dZ > 0.1 cm are marked.
2. Especially for fixed target there is significant increase of σ_dZ, due to long bunches used for this data sets (~0.1 – 0.4 time buckets). As result of this there is significant overestimation of track reconstruction efficiencies around membrane (η ~ -1) reported during the last analysis meeting.
3. This issue has been address ~ 3 year ago by Irakli by trying to measure event time using EPD. The plots are showed that this issue has to be readdressed.

https://www.star.bnl.gov/~ctsang/Alignment/DepositedCharge/summarydE.html  is estimated deposited energy (keV/cm³/event) versus Z and pad row (negative for East part of TPC) for 2019-2023 datasets. This is very good input for Space Charge Distortion calculations.

 

Jim:

1. We have noticed rapid TPC drift velocity increase with new methane bottle.

 

 

                                                              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 videbaek via Star-tpc-l <star-tpc-l AT lists.bnl.gov>
Date: Thursday, July 6, 2023 at 8:09 AM
To: Star-tpc L <Star-tpc-l AT lists.bnl.gov>
Subject: [Star-tpc-l] weekly tpc meeting

Reminder about meeting today at noon.


I unfortunately cannot attend today, but since we are running suggest we
keep the meeting.

F





Topic: STAR TPC Weekly Meeting

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

phone: 631-344-4106
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