New results on the plasmas produced by an e-beam in a vacuum diode are presented. In the near-uv range, we measure the plasma expansion speeds by the Doppler-shift and by the time-of-flight methods. The maximum observed speed of 2.4×107 cm/sec for the C+3 ions leads us to estimate the electric field which is probably in the range of 1–6 kV/cm and may exist for tens of nsec. Some aspects of the spectral characteristics, the collective field effect, and the partition of the discharge energy are discussed in connection with recent literature.
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Wei et al. (1979) studied this question.
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