Instrumentation for the proposed low energy RHIC electron cooling project DISCLAIMER INSTRUMENTATION FOR THE PROPOSED LOW ENERGY RHIC ELECTRON COOLING PROJECT*

Abstract There is a strong interest in running the Relativistic Heavy Ion Collider (RHIC) at low ion beam energies of 2.5-20GeV/nucleon; this is much lower than the typical operations with 100GeV/nucleon. The primary motivation for this effort is to explore the existence and location of the critical point on the QCD phase diagram. Electron cooling can increase the average integrated luminosity and increase the length of the stored lifetime. A cooling system is being designed that will provide a 10 -50mA electron beam with adequate quality and an energy range of 0.9 -5MeV. The cooling facility [1] planned in RHIC will include an SRF gun and booster cavity, and a beam transport to one ring to allow electron-ion co-propagation for ~ 12m, then a 180 degree U-turn electron transport so the same electron beam can similarly cool the other counter-rotating ion beam, then to a dump. The instrumentation systems that will be described include current transformers, BPMs, profile monitors, an emittance station and loss monitors