Stopping power in anisotropic, magnetized electron plasmas

We performed particle-in-cell (PIC) computer simulations to investigate the stopping power on a heavy, highly charged ion in an anisotropic electron plasma in the presence of a static external magnetic field. The related energy transfer of the ion to the electrons can be viewed as the basic process of the interaction between an ion beam and the electron beam in the cooling section of a heavy ion storage ring. For low ion velocities, our simulations show an enhancement of the stopping power for ions moving transversal to the magnetic field compared to the case without magnetic field. Taking into account the velocity distribution of the ions in an ion beam also an enhancement of the longitudinal stopping power measured in experiments is expected. Our results are qualitatively in good agreement with an experiment at the test storage ring (TSR). (C) 2000 Elsevier Science B.V. All rights reserved.