Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

Present: Alexei, Tommy, Yuri, Gene, Jim, Zachary, and myself

== Hardware

— West laser function was lost and is being repaired

— electrical problem, not mechanical

— polarity switch is ongoing (started today at 9 am)

— position of TPC was noted yesterday

— also trying to fix temperature in DAQ room (still 90 deg.)

— several systems currently off due to high temp

— have ~10 days methane supply remaining

— decision on whether to resume run should be made tomorrow

— can decide on what to do about low methane supply then

— current consumption is about 1.5 l/min

== Electronics

— Flemming sent an update to the list separately

== Software

— Zachary looking at dE/dx in FXT with new calibration production

— in FXT from 2019 and 2020 there is a ~2 sigma offset for the proton band

— in all energies but 7.2 GeV (which had not yet been produced)

— new calibration is closer but still ~1 sigma off (band is above expected position)

— has a recalibrated set, using Bichsel fits to proton band, up to 5.2 GeV

— ToF uses dE/dx identified protons and pions for finding common T0

— above reported offset affects that algorithm due to magnitude of offset

— implemented a T0 “afterburner” with recalibrated nsigma

— demonstrates recovered identified protons with recalibrated method

— will look at effect in new P23id production

— Bao Xin working on SC calibration for Run23

— all working, now using most recent data

— can ask him to document his procedures for the next person who works on SC

— Richard T was at BNL for AGS/RHIC meeting, met with Gene, and is working on Run23 SC

— Yuri was blocked (job submission) since Monday

— still exploring split in nHitsFit near membrane in 3.85 GeV FXT

— also working on jitter in FXT and anomalous temp and pressure dependence of dE/dx in 17.3 GeV

— then will finish combined PID

== AOB

— No new items for this week

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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