Abstract
A theory of a gas-filled diode is developed by making use of the fractional charge neutralization f originating from the ionization of neutrals in the diode. The diode voltage is self-consistently determined in terms of the gas pressure and species. Ions in the diode are created from neutral particles by the electron impact-ionization. A formula for circuit analysis is obtained, including external elements. Several points are noteworthy from the theoretical study. First, as expected, the fractional charge neutralization approaches unity rather quickly for a high gas density. Second, the profile of a gas-filled diode voltage is very different from that of the vacuum-diode voltage. Third, the strength of the gas-filled diode voltage decreases drastically as the neutral number density increases. Fourth, it is also shown that time profile of the gas-filled diode voltage deviates dramatically from the sine waveform, although the diode current is very close to the waveform. The gas-filled diode voltage is therefore very sensitive to the gas pressure in the diode.
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