Probe Diagnostics in Negative Ion Containing Plasma

書誌事項

タイトル別名
  • Probe Diagnostics in Negative Ion Conta
公開日
1988
DOI
  • 10.1143/jpsj.57.887
公開者
一般社団法人 日本物理学会

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説明

The effect of negative ions on the probe characteristics is studied theoretically and experimentally by using iodine and iodine-argon mixture plasmas. For a small ratio of negative ion to electron densities, the negative ion density and temperature can be determined from a sharp peak on the second derivative of the probe characteristics. At a higher ratio, the ratio of saturation currents at positive and negative probe biases should be used by calibrating the ratio with that of the case without negative ions. For a negative ion dominating plasma, a change of the Bohm criterion by negative ions should be considered and the parameters can be obtained from the probe characteristics which are nearly symmetric at positive and negative biases.

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