Abstract
In an experiment to study the heating of a mirror confined hydrogen plasma (Bz=2–4.3 kG, ne=2×1013 and 2×1014 cm−3) by an intense pulsed relativistic electron beam (1 MV, 100 kA, 50 nsec), the effect of the diode magnetic field gradient on the strength of the beam plasma interaction has been examined. It is found that at constant beam current, the energy transferred to the plasma as measured by diamagnetism is increased when the beam is either launched from a smaller cathode or is launched into a converging magnetic field, both of which increase the beam density. At high plasma density the diamagnetism agreed with the prediction of Thode for the two-stream instability at the lowest values of nb/np investigated, but failed to scale upward as rapidly as predicted. At low plasma density, anomalous resistivity and ion heating are observed which is consistent with the appearance of the ion acoustic instability.
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