MOPF11
BNL, Upton, Long Island, New York, USA
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.
TUPF12
Tech-X, Boulder, Colorado, USA
RadiaSoft LLC, Boulder, Colorado, USA
BNL, Upton, Long Island, New York, USA
Relativistic electron cooling is a key technology for achieving high luminosity required by the next generation of electron-ion and hadron-hadron colliders. We present a selection of computational techniques developed over the past several years for modeling the cooling physics on the ‘‘microscopic" timescales, i.e., during a single traversal of the cooling system. We will discuss modeling of the coherent electron cooling (CeC) scheme and its variants, and also the computation of the dynamical friction force responsible for conventional electron cooling. Modeling CeC requires a coupling between delta-f-PIC simulation of the modulator, customized simulations of the FEL amplifier, and electrostatic PIC simulations of the kicker subsections of the CeC cooler. Improved algorithms for computing the dynamical friction in single-pass frictional cooling simulations allow to control noise and correctly account for the statistics of rare but strong small-impact-parameter electron-ion collisions. We will present and briefly discuss the results of our simulations for the parameters of the CeC Proof-of-Principle Experiment at RHIC and the proposed MEIC CCR.
WEWAUD01
Stony Brook University, Stony Brook, USA
BNL, Upton, Long Island, New York, USA