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Title: RHIC Polarization Decay in FY15 pp Run due to Polarization Profile Development

Abstract

The decay over time of ratio between polarization profile and beam profile has been analyzed previously. A follow up question is if we can get the decay of polarization profile and beam profile separately. With the beam profiles obtained from Ion Profile Monitor (IPM), this analysis was done and the results are analyzed. The results show that the contribution from polarization profile and beam profile is similar for yellow ring, but the contribution from polarization profile is much stronger in blue ring, which is consistent with lower polarization Blue ring.

Authors:
 [1];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Collider-Accelerator Dept.
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider (RHIC)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1257958
Report Number(s):
BNL-112271-2016-IR
R&D Project: KBCH139; KB0202011
DOE Contract Number:
SC00112704
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; Relativistic Heavy Ion Collider

Citation Formats

Huang, H., and Adams, P. RHIC Polarization Decay in FY15 pp Run due to Polarization Profile Development. United States: N. p., 2016. Web. doi:10.2172/1257958.
Huang, H., & Adams, P. RHIC Polarization Decay in FY15 pp Run due to Polarization Profile Development. United States. doi:10.2172/1257958.
Huang, H., and Adams, P. Mon . "RHIC Polarization Decay in FY15 pp Run due to Polarization Profile Development". United States. doi:10.2172/1257958. https://www.osti.gov/servlets/purl/1257958.
@article{osti_1257958,
title = {RHIC Polarization Decay in FY15 pp Run due to Polarization Profile Development},
author = {Huang, H. and Adams, P.},
abstractNote = {The decay over time of ratio between polarization profile and beam profile has been analyzed previously. A follow up question is if we can get the decay of polarization profile and beam profile separately. With the beam profiles obtained from Ion Profile Monitor (IPM), this analysis was done and the results are analyzed. The results show that the contribution from polarization profile and beam profile is similar for yellow ring, but the contribution from polarization profile is much stronger in blue ring, which is consistent with lower polarization Blue ring.},
doi = {10.2172/1257958},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon May 23 00:00:00 EDT 2016},
month = {Mon May 23 00:00:00 EDT 2016}
}

Technical Report:

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  • The polarization information is important for the spin physics program in Relativistic Heavy Ion Collider (RHIC). There are discrepancies between AGS and RHIC polarization measurements. First, the face value of AGS polarization is higher than RHIC ones in general. Second, the measured polarization profile (described by the profile ratio R) is stronger in AGS than in RHIC. This note analyzes the polarization data from FY15 pp run period. The results show that the differences between AGS and RHIC polarization measurements are reasonable, but the R value difference is puzzling. The difference between blue and yellow ring is worth of spinmore » simulation to explain.« less
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