Effect of solenoid field errors on electron beam temperatures

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 microm-eters, reducing the effective transverse temperature by or-ders of magnitude. Studies of the effect of solenoid field errors on electron beam temperatures are reported