The problem of saturat ing a particular configuration of space with electrons is consid ered. It is shown that with unipotential guns of axial symmetry derived from space charge limited diodes t here exist both a minimum energy and a maximum widLh-Lo-lengLh ratio of the space that can be saturated. These limi Ls arc derived for the case of convergent flow between concen tric sp heres. Sim ilar limits for partia l saturation of t he space are derived for cases of convergent, parallel, and dive rgent flow.
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Simpson et al. (1963) studied this question.
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