MOIDCC005
BNL, Upton, Long Island, New York, USA
First photocurrent from ERL SRF gun at BNL has been delivered in November 2014. In June 2015 a high charge 0.5nC and 20 uA average current were demonstrated. In July 2015 the gun to dump beam test started. The beam was successfully transported from the SRF gun through the injection system, then through the linac to the beam dump. All ERL loop components have been installed. In October 2015, the SRF gun cavity has been found contaminated during severe cathode stalk RF conditioning. This cavity has been sent for repair and modification for later use in the low-energy RHIC electron cooler (LEReC). LEReC scheduled to start commissioning in early of 2018 [1]. We present our results of BNL ERL beam commissioning, the measured beam properties, the operational status, and future prospects.
[1] D. Kayran et all.,. First Results of Commissioning DC Photogun for RHIC Low Energy Electron Cooler (LEReC). In this procedures.
BNL, Upton, Long Island, New York, USA
Non-magnetized bunched electron cooling of ion beams during low energy RHIC operation requires electron beam energy in the range of 1.6-2.6 MeV, with an average current up to 45 mA, very small energy spread, and low emittance. A 400 kV DC gun equipped with a photocathode and laser system will provide a source of high-quality electron beams. During DC gun test critical elements of LEReC such as laser beam system, cathode exchange system, cathode QE lifetime, DC gun stability, beam instrumentation, the high-power beam dump system, machine protection system and controls has been tested under near- operational conditions [1]. We present the status, experimental results and experience learned during the LEReC DC gun beam testing.
[1] D. Kayran et al., DC Photogun Gun Test for RHIC Low Energy Electron Cooler (LEReC), NAPAC2016 proceedings, WEPOB54.
WEIDCC002
BNL, Upton, Long Island, New York, USA
Stony Brook University, Stony Brook, USA
SUNY SB, Stony Brook, New York, USA
SBU, Stony Brook, New York, USA
We are commissioning the accelerator for the Coherent Electron Cooling Proof-of-principle (CeC PoP) Experiment. The 113 MHz superconducting RF gun with Cs2KSb photocathode serves as a source of the electrons. The gun is designed to operate up to 5 nC beam with repetition rate of 78 kHz. In the paper we present status of the gun as well as achieved beam parameters. The photocathode performance (quantum efficieny, lifetime) is also discussed.