Reversed field geometry generated with a rotating e-beam

A reversed magnetic field configuration has been produced by injecting a rotating relativistic e-beam (1.2 MeV, 50kA) along a 1.8 kG guide field into 85μ neutral H2 (Typically, T/sub e/ = 5eV, n/sub e/ = 5 x 1015cm-3). End-on photography, radial scans with Thomson scattering, and CO2 interferometry are in agreement with an MHD equilibrium model fitted to measurements of the excluded flux and the beam-induced axial (ΔB/sub z/) and azimuthal (B/sub theta) fields. The resulting magnetic field configuration is similar to a belt pinch, with cross-section length-to-width ratio of 20, and midplane β congruent to .5. The absence of hard x-ray emission after beam passage shows these fields are induced by plasma currents, rather than trapped beam electrons