Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

Present: Alexei, Flemming, Jim, Tommy, Prashanth, Yuri, Gene, and myself

== Hardware

— Working on lasers 

— east alignment is finished

— both lasers are working and operational

— spare pump is in hand

— checked cathode today

— no shorts so far

— finishing structure to hold magnetic coils

— next week east poletip going in (on 28th)

— gas flow starting April 18th per operations meeting

— magnet polarity switching time about 3-5 hours (related to discussion last week)

— (Prashanth) now buying gas from Lindy (sp?) 

— Prashanth ordered all needed gases

— AirGas actually supplying methane since Lindy couldn’t deliver

— also ordered another 2 6-packs from different company 

— Alexei suggested another possibility, Mathison (or Madison), Prashanth will follow-up

== Electronics

— summary in slides from yesterday

— just one RDO remains with some fuses to change

== Software

— information from Irakli

— will provide resolution vs. momentum for new and old alignment soon?

— update on O+O 200 GeV (RFF vs FF observed difference)

— revisited RFF O+O from August-September 2022

— see plots in agenda for today’s meeting

— evidence from FF for an approximately 1 mrad rotation of TPC

— looked at vertices reconstructed from tracks in east only and west only in low lumi fixed target data

— see approximately 2 time bucket shift between east and west for fixed target (as reported earlier by Xiangli)

— see additional plot in meeting agenda

— Temple University transitioning TPC work from Babu to Richard Thrutchley

— will deal with Run 22 calibration

— good positioning for this work due to previous use of calibration in calorimeter for TPC calibration

== AOB

— Yuri updated RDO mask and dead FEE map for all BES data sets

— need to check if any issues remain for ‘20 and ‘21 sets

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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