Star-tpc-l mailing list

[videbaek <videbaek AT bnl.gov>]

Thanks for the minutes.
I hope we can get link to today's presentations. Then I will add them to 
the
stored minutes on the drupal page.

I was reminded during the discussion on alignment about what Jim brought 
up 2 weeks ago about the 'not known' magnitude of padplane stretching of 
the outer sectors, and the suggestions that the stretch in x,y gets 
included in the aignment procedure. This uld well be important.

best Flemming




On 2023-10-12 13:12, Richard Witt via Star-tpc-l wrote:
> Present: Alexei, Flemming, Daniel, Mathias, Tommy, Yuri, Irakli, Gene,
> and myself
>
> == Hardware
>  — last Monday was smoke alarm in STAR
>  — smelled something from TPC FEE rack
>  — found problem yesterday, was burned VME module (discussed on
> Star-Ops list)
>  — Tonko now continuing with TPC repair (FEEs etc.)
>  — replaced valves to fix leak (valve between purifier and dryer)
>  — replaced dryer and started purifier recovery yesterday
>
> == Electronics
>  — nothing new to report this week
>
> == Software
>  — FXT TPC Embedding studies by Mathias Labonte
>  — 3.2 and 7.7 GeV
>  — differences noted in nHits and DCA distributions as functions of
> eta and pt
>  — evidence of track breaking at central membrane?
>  — concern about jitter in trigger being root cause
>  — excess of hits in real data vs. embedding near end caps
>  — not yet well understood
>  — slides to be posted to the TPC list
>  — supersector alignment work from Irakli
>  — still see some improvement from outer sector then inner sector
> alignment
>  — setting supersector alignment parameters to zero seems to already
> give resolution < 200 um (in Y)
>  — Yuri would like to repeat the K0 short study with no alignment
> parameters (survey result only)
>  — compare K0 mass with tracks from same sector and from different
> sectors
>  — reminder that for supersectors, some overall shift, overall
> rotation, and overall expansion are convoluted
>  — new method needed for supersector alignment
>  — Yuri looking at effect of different length cables on region near
> end cap
>
> == AOB
>  — Gene asks for some feedback on the level of statistics needed in
> a calibration sample for Mathias’ studies
>
> 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 [1]
>     United States Naval Academy         Email: witt AT usna.edu
> ~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~
>
> Links:
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> [1] tel:410-293-6675
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--
Flemming Videbaek
senior scientist, emeritus
videbaek @ bnl.gov
Brookhaven National Lab
Physics Department
Bldg 510D
Upton, NY 11973

phone: 631-344-4106
cell     :  631-681-1596