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[James H Thomas <jhthomas AT berkeley.edu>]

Dear TPCers,

June 7th evening shift was a shutdown due to the Canadian Fires.  The Fire Department was worried about particles in the air setting off their high sensitivity smoke alarms so they shut the alarm system down ... consequently all of STAR had to shut down too.  So power was off to the Hall for several hours.   Also, it appears that major work was done on the MCW system while other things were off.

Perhaps, when STAR came back up, the TPC Cathode was set to a slightly different value?

Cheers,
Jim

--

Jim Thomas

Email: jhthomas AT berkeley.edu

Phone:  USA  (510) 759-4936

Homepage: https://sites.google.com/berkeley.edu/jhthomas

Please don't feel obligated to respond to this message outside of your normal working hours.

On Thu, Jan 4, 2024 at 12:23 PM Richard Witt via Star-tpc-l <star-tpc-l AT lists.bnl.gov> wrote:

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

== Hardware

— Nothing new reported, Alexei back next week

== Electronics

— Tim and Tonko started working on outstanding issues (replacing cables, fuses, etc.)

== Software

— TPC survey was done, Yuri does not yet have results he needs from the survey 

— they were promised to him for next week

— Yuri revisited alignment based on the studies shown by Rongrong before the holidays

— was some T0 change that was not accounted for and exploring alignment parameters

— would like to have alignment done for all of past 5 years

— Tommy working on TPC RS

— comparing DAQ 5k and DAQ 1000

== AOB

— Gene looking at field cages shorts from past couple years

— spotted a sharp jump of ~15 volts in central membrane voltage 

— decayed down by ~5 volts over a few days

— all 4 field cage currents showed a sharp rise at the same time though the decay profile was different

Best Regards,

  Richard

Sent from my iPad

-- 
"Education is the most powerful weapon which you can use to change
the world."

--Nelson Mandela

~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~
 Richard Witt, Professor of Physics     Phone (USNA): 410-293-6675
    United States Naval Academy         Email: witt AT usna.edu
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