Title :
A near-integer working point for polarized protons in the relativistic heavy ion collider
Author :
Montag, C. ; Bai, M. ; Beebe-Wang, J. ; Blaskiewicz, M. ; Calaga, R. ; Fischer, W. ; Jain, A. ; Luo, Y. ; Malitsky, N. ; Roser, T. ; Tepikian, S.
Author_Institution :
Brookhaven Nat. Lab., Upton
Abstract :
To achieve the RHIC polarized proton enhanced luminosity goal of 150 - 1030 cm-2sec-1 on average in stores at 250 GeV, the luminosity needs to be increased by a factor of 3 compared to what was achieved in 2006. Since the number of bunches is already at its maximum of 111, limited by the injection kickers and the experiments´ time resolution, the luminosity can only be increased by either increasing the bunch intensity and/or reducing the beam emittance. This leads to a larger beam-beam tuneshift parameter. Operations during 2006 has shown that the beam-beam interaction is already dominating the luminosity lifetime. To overcome this limitation, a near-integer working point is under study. We will present recent results of these studies.
Keywords :
ion accelerators; particle beam bunching; particle beam injection; particle beam stability; proton polarisation; storage rings; synchrotrons; RHIC polarized proton; Relativistic Heavy Ion Collider; beam emittance; beam lifetime; beam-beam interaction; beam-beam tuneshift parameter; bunch intensity; injection kickers; near-integer working point; Polarization; Protons;
Conference_Titel :
Particle Accelerator Conference, 2007. PAC. IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
978-1-4244-0916-7
DOI :
10.1109/PAC.2007.4440926