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The Low Energy RHIC electron Cooler (LEReC) is currently under commissioningat BNL to improve RHIC luminosity for heavy ion beam energies below 10GeV/nucleon. The linac of LEReC consists of a DC photoemission gun, one 704 MHzsuperconducting radio frequency (SRF) booster cavity, and three normalconducting cavities. It is designed to deliver a 1.6 MeV to 2.6 MeV electronbeam, with peak-to-peak momentum spread dp/p of less than 7e4. Two of the threenormal conducting cavities will be used in LEReC for energy spread correction.A single-cell 704 MHz cavity for energy de-chirping and a three-cell 2.1 GHzthird harmonic cavity for RF curvature correction. In this paper, we presentthe designs and RF test results of these two cavities.

Design and test of 704 MHz and 2.1 GHz normal conducting cavities for Low Energy RHIC electron Cooler