sPHENIX cold QCD topical group

["Yip, Kin" <kinyip AT bnl.gov>]

Hi,

The end-of-store measurement failed .   It was not zero.  It's just a measurement failure.  I hope STAR can give you something.

Kin

-------- Original message --------

From: Itaru Nakagawa <itaru AT riken.jp>

Date: 5/17/24 23:15 (GMT-05:00)

To: "Yip, Kin" <kinyip AT bnl.gov>, "Nagle, James" <Jamie.nagle AT colorado.edu>

Cc: SPHENIX-cold-QCD L <sPHENIX-cold-QCD-l AT lists.bnl.gov>

Subject: Re: Polarization of the store this morning

Hi Kin,

  So it was the problem of the polarimeter measurement. It is unusual to
loose polarization to be zero during a store from my knowledge, so can
we still expect some polarization even at the end of that store?

  I'll try to ask J.H. what kind of asymmetry observed in STAR around
the time when we took ZDC dedicated data.

Regards,

-itaru


On 2024/05/17 20:47, Yip, Kin wrote:
> Hi,
>
> I was able to ask the operator who took the measurement this morning.  He told me that
> they had problem with "polarControl" (the software ... which is kind of similar software in AGS and RHIC that I'm very familiar with) which got stuck.
>
> While they tried to get help from Seth (as Haixin is on vacation) to figure out "polarControl", they had to dump the store for machine development and so there was no more end-of-store measurement.
>
> Kin
>
> -----Original Message-----
> From: Yip, Kin
> Sent: Friday, May 17, 2024 8:41 PM
> To: Itaru Nakagawa <itaru AT riken.jp>; Nagle, James <Jamie.nagle AT colorado.edu>
> Cc: SPHENIX-cold-QCD L <sPHENIX-cold-QCD-l AT lists.bnl.gov>
> Subject: RE: Polarization of the store this morning
>
> Hi,
>
> I guess you're talking about 34485.203 :
> https://www.cnipol.bnl.gov/rundb/?rp=24&rn=&himg=&pi=&mt=&be=&to=&ti=&sb=Select
>
> That obviously was a failed attempt (at the end of a store).   Successful measurement would take 40M or 50M events etc. But this run has < 200K events.
>
> http://elog.pbn.bnl.gov:8080/elogs/entryList.jsp?ELOG=P-Carbon-Polar_Stay&PAGE=1&ELOGTYPE=System  shows some non-zero no. but with huge uncertainty ( 2601.63 ± 1071.24 ) % 😊
>
> The previous measurements showed 30+% or higher ...
>
>
> Kin
>
> -----Original Message-----
> From: Itaru Nakagawa <itaru AT riken.jp>
> Sent: Friday, May 17, 2024 7:09 PM
> To: Yip, Kin <kinyip AT bnl.gov>; Nagle, James <Jamie.nagle AT colorado.edu>
> Cc: SPHENIX-cold-QCD L <sPHENIX-cold-QCD-l AT lists.bnl.gov>
> Subject: Polarization of the store this morning
>
> Hi Kin and Jamie,
>
>    We are analyzing ZDC dedicated data we took this morning and getting
> zero asymmetry. According to the pC polarimeter page, the polarization
> measurement at the end of the store 34485 around 10AM measured 0% in
> blue. No measurement attempted for Yellow. Have you heard any reason for
> this reason?
>
> Regards,
>
> -itaru