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.
WEXAUD01
RadiaSoft LLC, Boulder, Colorado, USA
We review computational work on single-pass dynamics for relativistic hadrons in electron cooling systems relevant to high-luminosity electron-hadron colliders *. We identify parameter regimes where binary collisions must be correctly treated and where they can be neglected. The mathematically correct derivation of non-magnetized dynamical friction is presented, showing how the modified Pareto distribution of impact parameters can lead to incorrect interpretation of numerical results. We discuss important aspects of dynamical friction in magnetized electron cooling that require additional study.
* D.L. Bruhwiler, 'Simulating single-pass dynamics for relativistic electron cooling,' ICFA Beam Dynamics Newsletter 65, Eds. Y. Zhang and W. Chou (2014).
