Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

Thank you for the fast answers Yuri!

Cheers,
  Richard

On 8/14/25 12:36, Fisyak, Yuri V wrote:
> Hell all, the answers on Richard quests:
> — need to verify with Yuri that he is using the old digital device 
> _only_ to determine field direction
>          The current TFG version (>= 25e) is using the STAR main magnet 
> current measurement for switching between FF, HF, ZF, RHF, RFF.
> This modification has not been propagated  to SL yet.
> — also need to verify whether Yuri is using the NMR for anything
> The NMR measurements are not used  in reconstruction. We only use the 
> fact that NMR is by a factor ~10 more stable  than the STAR main 
> magnet current  measurements.
>
>
>
>                                                                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 
> <mailto:fisyak AT bnl.gov>_
>
> *From: *star-tpc-l-request AT lists.bnl.gov <star-tpc-l- 
> request AT lists.bnl.gov> on behalf of Richard Witt <star-tpc-l AT lists.bnl.gov>
> *Date: *Thursday, August 14, 2025 at 12:26 PM
> *To: *Star-tpc L <Star-tpc-l AT lists.bnl.gov>
> *Subject: *[[Star-tpc-l] ] TPC Meeting Minutes
>
>
> Present: Flemming, Alexei, Jim, and myself
>
>
> == Hardware
> — problem this past Saturday
> — east laser was dark
> — around 9 am, gas system began to misbehave (fluctuations in flow meter)
> — if methane drops for more than 1 minute system will go into purge mode
> — made some changes in potentiometer (adjust flow from 1.5 to 1.7)
> — this slightly increased methane content therefore drift velocity is 
> slowly increasing
> — dropped back from 1.7 to 1.54 this morning (was not stable even at 1.52)
> — will continue to monitor and adjust if necessary
> — changed two mirrors for east laser during access yesterday
> — mirrors are now clean, but still have issue, perhaps crystal (needs a 
> day to change)
> — have 10 minute access today to better evaluate needed changes
> — also lost NMR probe (happening often, every several days)
> — loses lock
> — need to have a written instruction for shift crews (how to monitor, 
> what to do, etc.)
> — need to verify with Yuri that he is using the old digital device 
> _only_ to determine field direction
> — also need to verify whether Yuri is using the NMR for anything
>
>
> == Electronics
> — the usual RDO and FEE outages occurring, nothing unexpected
> — 1 to 3 RDOs lost per day
> — fixed weekly as Tonko when time is available
> — likely need to pay careful attention if analyses are very sensitive to 
> systematics
>
>
> == Software
> — Nothing reported this week
>
> == AOB
> — Nothing new 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
>
> ~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~
>   Richard Witt, Professor of Physics     Phone (USNA): 410-293-6675 
> <tel:410-293-6675>
>      United States Naval Academy         Email: witt AT usna.edu 
> <mailto:witt AT usna.edu>
> ~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~

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

--Nelson Mandela

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