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The Low Energy Relativistic Heavy Ion Collider (RHIC) electron Cooler (LEReC)is designed to deliver a 1.6 MeV to 2.6 MeV electron beam, with rms dp/p lessthan 5e-4. The superconducting radiofrequency (SRF) Booster Cavity is the majoraccelerating component in LEReC. It is a 0.4 cell cavity operating at 2 K,providing a maximum energy gain of 2.2 MeV. It is modified from an experimentalEnergy Recovery Linac (ERL) photocathode gun, and thus has fundamental powercouplers (FPCs), pickup (PU) couplers (field probes) and HOM coupler close toeach other on the same side of the cavity. Direct capacitive coupling betweenthe FPC and PU, called the crosstalk effect, combined with microphonicdetuning, can induce closed loop voltage fluctuations that exceed the totalenergy spread requirement of LEReC. The crosstalk effect in this cavity ismodelled, simulated, and measured, and A correction method is proposed anddemonstrated to suppress the voltage fluctuation so that energy spreadrequirement can be met.

Correction of crosstalk effect in the low energy RHIC electron cooler booster cavity