Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

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

== Hardware

— many problems currently

— cathode readout producing spontaneous trips (fake, but shutdown PS)

— cleaned-up and testing today

— pulse production for calibration also lost proper control

— replacing battery and reprogramming

— TPC circulation started yesterday

— magnet testing today (FF polarity)

— after magnet testing done will try for cosmics and lasers

— TPC appears to be sitting at fullest extent of motion in one direction (about 5 mm shift)

— northwest corner is fixed, look at motion on opposite side

— will check again when we have RFF polarity

— approximate time scale for having lasers and cosmics is today if all goes well

— STAR will be ready in the next couple days at the outset

== Electronics

— Tonko (on vacation now) communicated with Flemming

— struggling with updating TPX firmware (not stable)

— running in test setup (not on TPC itself)

— can reach 3.2 kHz, but faster scrambles data (likely software related)

— could impact physics goals for run (goals were based on 4.5-5 kHz)

— taking a step back temporarily

— will use first few weeks of run to improve

— new software framework on all DAQ PCs

— new cluster finder on TPC and TPX

— new network and events builders

— one iTPC sector (sector 1) running new firmware (need to watch it)

— make sure it’s stable in cosmics

— if so will update other firmware

— will start changing TPX firmware upon return

— Gene can process incoming cosmics once a day at start

== Software

— about presentation from Yiding (updated from last week)

— checked low pt e- band that was observed in SL22b in SL23a

— claim is strange band is visible in all BES data 

— band is not visible in SL23b processed data from 200 GeV O+O

— would be good to confirm by reprocessing an older set in SL23b

— Gene mentioned that the 19.6 GeV is already in the queue but may be far down

— will look at doing calibration production in SL23c for comparison

— on extra gain calibration 

— mismatch in dB tables with actual RDO outages

— fixed some RDOs by hand for 2019

— tried applying same search to Runs 20-22 and found many mismatches

— lost RDOs

— Yuri has cleaned up Run 22, but many mismatches remain in other runs

— many are in Run 20 but 21 as well

== AOB

— Yuri will be absent next week

— but watching what’s happening with detector and cosmics

— Yuri will also look at O+O to analyze some questions about TPC but also ToF

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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