Polarization Issues in Run 2008

Zhang,S.Y. ; Ahrens, L. ; Huang, H. ; Zeno, K.

Brookhaven National Laboratory

关键词: 43 Particle Accelerators;    Brookhaven Ags;    Polarization;    Brookhaven Rhic;    Proton Beams;   

DOI  :  10.2172/939984
RP-ID  :  BNL--81597-2008-IR
RP-ID  :  DE-AC02-98CH10886
RP-ID  :  939984

美国|英语

来源: UNT Digital Library

【 摘 要 】

The RHIC proton beam polarization has a strong dependence on intensity in Run 2008, whereas the dependence is almost absent in Run 2006. Meanwhile, the RHIC beam transverse emittance also has a dependence on intensity in Run 2008, but little in Run 2006. Using the emittance measurement at the AGS IPM and the BtA multiwires, the source of this difference between 2006 and 2008 runs is traced to the Booster. It is found that at least the degree of the vertical scraping in the Booster is different in 2006 and 2008. The effect of this scraping for the RHIC beam emittance and polarization is studied.