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The surface-flashover anode plasma in a magnetically insulated ion diode was investigated spectroscopically. From the Stark broadening of the neutral hydrogen H_β line an average electron density of about 2×{}10¹⁵/cm³ was observed in the {} 1-mm anode plasma, 30 nsec into the 400-475-kV diode voltage pulse. Thereafter, the plasma front advanced into the diode gap at an average rate of 2 cm/{μ}sec. This may be explained by the ionization of neutral atoms injected into the gap during flashover.
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Pal et al. (1983) studied this question.
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