The reliability of measuring low electron density plasma by the microwave free space method

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概要

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• Electron density measurements of steady state helium plasmas in glass cylinders 17 to 96mm in diameter are made at 34GC and at pressures of 0.08 to 1.0mmHg and densities of about 5×10<SUP>10</SUP> to 10<SUP>12</SUP> cm<SUP>-3</SUP>.<BR>Standard pyramidal horns of 20db gain and teflon lenses about 75mm in diameter are used. Errors arising from the multiple reflection between antennas and the spreading of microwave beams incident on plasmas are investigated. It is shown that the reliability of more than 90% is attainable for low density plasmas when an, appropriate use is made of the free space method. The reliability obtained by Langmuir probe method is taken as reference.

• 社団法人 プラズマ・核融合学会の論文

著者

• 塩原 信司

  理化学研究所.核融合研究室

関連論文

• The reliability of measuring low electron density plasma by the microwave free space method

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