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We have measured the electric field in the high-voltage gap of a magnetically insulated intense-ion-beam diode by observation of the Stark shift of line emission from ions accelerating in the gap. The electric field distribution as a function of distance from the anode plasma has been compared with a theoretical model and is not consistent with a well confined electron sheath near the cathode. Furthermore, a very rapid gap closure at early time in the pulse was clearly observed.
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Maron et al. (1986) studied this question.
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