MOXAUD03
BNL, Upton, Long Island, New York, USA
An electron cooler is presently under construction to improve the luminosity of the Relativistic Heavy Ion Collider (RHIC) for heavy ion beam energies below 10 GeV/nucleon. Required electron beam and its acceleration (up to 2 MeV in Phase-I and up to 5 MeV in Phase-II) are provided by the photoemission electron gun and the RF linear accelerator. As a result, cooling will be accomplished by using bunched electron beams produced by high-brightness high-current electron linear accelerator. In addition, this will be the first electron cooling applied directly in a collider. In this presentation we describe accelerator physics requirements, design considerations and parameters, as well as associated challenges of such a low-energy RHIC electron cooler (LEReC).
*Presented for the LEReC team.
TUYAUD02
BNL, Upton, Long Island, New York, USA
Stony Brook University, Stony Brook, USA
High current ERL is essential for high energy electron coolers: magnetized, non-magnetized, coherent and other. SRF Linac with well dumped HOMs and high current low energy electron injector are required. At BNL the R&D high-current ERL is under commissioning. The key components of this ERL are: the highly damped 5-cell superconducting RF cavity and the high-current superconducting RF gun. The gun is equipped with multi-alkaline photocathode insertion system. Gun and Linac operating RF frequency is 703.59 MHz. Current laser operates at 10 MHz. The R&D ERL is designed to generate 350 mA of average current. The unique design of merger system allows operating at low injection energy while preserves emittance. The flexible returning loop optics allowed to study different aspects of stability operation. Recently 500 pC per bunch charge and 5mA current in short pulses has been demonstrated. Some aspects of BNL R&D ERL design and beam tests results will be discussed. After ERL commissioning in BLDG 912 the ERL will be relocated to RHIC IP2 to be used for LEReC.