Effect of solenoid field errors on electron beam temperatures in the RHIC electron cooler
Brookhaven Nat. Lab., Upton, NY, USADOI: 10.1109/PAC.2003.1288758 Conference: Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the, Volume: 3
Source: IEEE Xplore
As part of a future upgrade to the Relativistic Heavy Ion Collider (RHIC), electron cooling is foreseen to decrease ion beam emittances. Within the electron cooling section, the "hot" ion beam is immersed in a "cold" electron beam. The cooling effect is further enhanced by a solenoid field in the cooling section, which forces the electrons to spiral around the field lines with a (Larmor) radius of 10 micrometers, reducing the effective transverse temperature by orders of magnitude. Studies of the effect of solenoid field errors on electron beam temperatures are reported.
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ABSTRACT: To improve cooling capability of electron coolers mag- netized beams in strong solenoid fields are used. Too avoid betatron coupling in the ion coupling compensation is re- quired. For the RHIC electron cooler we propose a scheme consisting of two identical solenoids with opposing fields, connected by a quadrupole matching section that preserves the electron beam magnetization. Since the fringe fields of the individual magnets overlap, the matching section can not be designed with standard optics codes. We developed an optimization code based on particle tracking instead. In- put for the program are the simulated/measured field maps of the magnets. We demonstrate that the transverse temper- ature of the electron beam does not increase.