A hollow, rotating 2.3-MeV electron beam, moving with axial velocity of {~}0.25c after injection through a magnetic-field cusp, is slowed down and trapped in a small magnetic mirror well by interaction with a 30-60-{Ω}/square resistive wall. The trapped-electron ring containing {~} 10¹² particles performs a damped oscillation about the well minimum and settles down into an equilibrium state.
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Hudgings et al. (1978) studied this question.
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