RHIC Au beam in Run 2014

[摘要] Au beam at the RHIC ramp in run 2014 is reviewed together with the run 2011 and run 2012. Observed bunch length and longitudinal emittance are compared with the IBS simulations. The IBS growth rate of the longitudinal emittance in run 2014 is similar to run 2011, and both are larger than run 2012. This is explained by the large transverse emittance at high intensity observed in run 2012, but not in run 2014. The big improvement of the AGS ramping in run 2014 might be related to this change. The importance of the injector intensity improvement in run 2014 is emphasized, which gives rise to the initial luminosity improvement of 50% in run 2014, compared with the previous Au-Au run 2011. In addition, a modified IBS model, which is calibrated using the RHIC Au runs from 9.8 GeV/n to 100 GeV/n, is presented and used in the study.

[发布日期] 2014-09-15

[学科分类] 核物理和高能物理

[关键词] BROOKHAVEN RHIC;TEV RANGE;GOLD 197 BEAMS;BEAM EMITTANCE;BEAM LUMINOSITY;BEAM BUNCHING;COMPARATIVE EVALUATIONS;LENGTH;BEAM INJECTION Relativistic Heavy Ion Collider