sPHENIX cold QCD topical group

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

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