Abstract
The process of beam spreading of field-emission electrons under the action of space charges, suggested by Maitland (1961) as an explanation of vacuum breakdown initiation, is analysed. This type of space charge effect is shown to be negligible. A plausible model of breakdown initiation as a result of ions focusing within the electron beam is discussed and shown to be unreal. The effects of space charges on the initiation of vacuum breakdown are thus concluded to be very small.
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