BNL, Upton, New York, USA
Stony Brook University, Stony Brook, USA
SUNY SB, Stony Brook, New York, USA
SBU, Stony Brook, New York, USA
The 113 MHz superconducting gun is used an electron source for the coherent electron cooling experiment. The unique feature of the gun is that a photocathode is held at room temperature. It allowed to preserve the quantum efficiency of Cs2KSb cathode which is adversely affected by cryogenic temperatures. Relatively low frequency permitted fully realize the accelerating field gradient what in turn helps to achieve 10 nC charge and 0.3 microns normalized emittance. We present the achieved performance and operational experience as well.
FRCOWBS03
BNL, Upton, New York, USA
The high-current high-brightness electron accelerator for cooling of RHIC ions at low energy (LEReC) was successfully commissioned at BNL. A beam quality suitable for electron cooling has been achieved. Cooling of single ion bunches in RHIC using a new approach of bunched-beam electron cooling was demonstrated during 2019. To achieve such a cooling with non-magnetized electron beams and RF acceleration required proper beam manipulation in the longitudinal phase space while preserving transverse emittances. Electron beam with kinetic energy of 1.6 MeV with beam quality suitable for cooling was successfully propagated through 100 meters of beam lines including dispersion sections and maintained through both cooling sections in RHIC. The LEReC accelerator includes a photocathode DC gun, a laser system, a photocathode delivery system, magnets, beam diagnostics, a SRF booster cavity, and a set of Normal Conducting RF cavities to provide sufficient flexibility to tune the beam in the longitudinal phase space. In this paper we discuss experience learned during LEReC beam commissioning.