Abstract
500-keV, 10-kA electron beams are injected into a magnetic mirror trap of Astron geometry without wall resistors. When using ${\mathrm{H}}_{2}$ and pressures of several hundred millitorr in the tank, we observe ring-shaped electron layers exhibiting field changes $\ensuremath{\rho}=\frac{\ensuremath{\delta}B}{{B}_{\mathrm{vac}}}$ of up to 120% in the trap center and lifetimes of up to 20 \ensuremath{\mu}sec. With the exception of a fast final "dump" when the $\ensuremath{\rho}$ of the layer has decreased to small values, we observe a smooth decay of the layer, roughly compatible with scattering of the fast electrons in the background gas.
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