caa a22 4500 386367582 CHVBK 20180307111941.0 cr unu---uuuuu 161130e198908 xx s 000 0 eng 10.1017/S0022377800014203 doi S0022377800014203 pii (NATIONALLICENCE)cambridge-10.1017/S0022377800014203 Numerical investigation of a plasma beam entering transverse magnetic fields [Elektronische Daten] We study plasma-beam injection into transverse magnetic fields using both electrostatic and electromagnetic particle-in-cell (PIC) codes. In the case of small beam momentum or energy (low drift kinetic β) we study both large- and small-ion-gyroradius beams. Large-ion-gyroradius beams with a large dielectric constant ε (M/m)½ are found to propagate across the magnetic field via E × B drifts at nearly the initial injection velocity, where and M/m is the ion-to-electron mass ratio. Beam degradation and undulations are observed, in agreement with previous experimental and analytical results. When ε is of order (M/m)½ the plasma beam propagates across field lines at only half its initial velocity and loses its coherent structure. When ε is much less than (M/m)½ the beam particles decouple at the magnetic field boundary, scattering the electrons and slightly deflecting the ions. For small-ion-gyroradius beam injection a flute-type instability is observed at the beam-magnetic-field interface. In the case of large beam momentum or energy (high drift kinetic β) we observe good penetration of a plasma beam by shielding the magnetic field from the interior of the beam (diamagnetism). However, we observe anomalously fast penetration of the magnetic field into the beam and find that the diffusion rate depends on the electron gyroradius of the beam. Copyright © Cambridge University Press 1989 Koga J. Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, U.S.A. Geary J. L. Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, U.S.A. Fujinami T. Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, U.S.A. Newberger B. S. Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, U.S.A. Tajima T. Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, U.S.A. Rostoker N. Department of Physics, University of California, Irvine, California 92717, U.S.A. Journal of Plasma Physics Cambridge University Press 42/1(1989-08), 91-110 0022-3778 42:1<91 1989 42 PLA https://doi.org/10.1017/S0022377800014203 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0022377800014203 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Koga J. Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, U.S.A NATIONALLICENCE 700 1- Geary J. L. Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, U.S.A NATIONALLICENCE 700 1- Fujinami T. Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, U.S.A NATIONALLICENCE 700 1- Newberger B. S. Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, U.S.A NATIONALLICENCE 700 1- Tajima T. Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, U.S.A NATIONALLICENCE 700 1- Rostoker N. Department of Physics, University of California, Irvine, California 92717, U.S.A NATIONALLICENCE 773 0- Journal of Plasma Physics Cambridge University Press 42/1(1989-08), 91-110 0022-3778 42:1<91 1989 42 PLA CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge