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The interaction between a wide ultrarelativistic fully-ionized plasma beamand a magnetic barrier is studied numerically. It is assumed that the plasmabeam is initially homogeneous and impacts with the Lorentz factor $\Gamma_0\gg1$ on the barrier. The magnetic field of the barrier $B_0$ is uniform andtransverse to the beam velocity. When the energy densities of the beam and themagnetic field are comparable, $\alpha = 8\pi n_0m_pc^2(\Gamma_0-1)/B^2_0\sim1$, the process of the beam -- barrier interaction is strongly nonstationary,and the density of reversed protons is modulated in space by a factor of 10 orso. The modulation of reversed protons decreases with decrease of $\alpha$. Thebeam is found to penetrate deep into the barrier provided that $\alpha >\alpha_{cr}$, where $\alpha_{cr}$ is about 0.4. The speed of such a penetrationis subrelativistic and depends on $\alpha$. Strong electric fields aregenerated near the front of the barrier, and electrons are accelerated in thesefields up to the mean energy of protons, i.e. up to $\sim m_pc^2\Gamma_0$. Thesynchrotron radiation of high-energy electrons from the front vicinity iscalculated. Stationary solutions for the beam -- barrier collision areconsidered. It is shown that such a solution may be only at $\alpha \lesssim0.2 - 0.5$ depending on the boundary conditions for the electric field in theregion of the beam -- barrier interaction. Some astrophysical applications ofthese results are briefly discussed.Comment: 11 pages, Latex (revtex), 12 postscript figures, submitted to Phys.  Rev.

Wide ultrarelativistic plasma-beam–magnetic-barrier collision