The function of upcoming E-lens requests the phase advance between the collision IP and location of E-lens(IP10) to be integer multiples of pi. The RHIC quadrupole mains were modified(phaseshifter) to allow the control of phase advance between IP8 and IP10 [1]. Measurements were made during RHIC run 2012 to confirm the effect of phaseshifter on the betatron phase advance between the two IPs. The results are reported in this paper.
In this article we review the beam-beam effects in the polarized proton runs in the Relativistic Heavy Ion Collider (RHIC). The operational observations, limitations, and the next luminosity goal are presented and discussed. With an upgraded polarized proton source, the proton bunch intensity will be increased from 1.7 × 10 11 up to 3.0 × 10 11 . To accommodate the large beam-beam tune spread in the current tune space between 2/3 and 7/10 and to compensate the nonlinear beam-beam resonance driving terms, head-on beam-beam compensation with electron lenses (e-lenses) is to be installed.
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