アルゴンが噴出するプラズマ電離場から抽出される粒子線特性

概要

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A experimental study using the time-of-flight(TOF) mass-spectrometer technique is performed on the characteristics of particle beams skimmed from plasma ionized flow fields of the expansion chamber into which neutral argon molecules are injected through the orifice of the gas source, where electric discharge is actualized by the hot-cathode method. The characteristics are examined from the TOF spectrum signals obtained by changing the discharge voltage and current, and the orifice location. Two clearly distinguishable spectra are always observed in short and long time-of-flight ranges of all the TOF spectra. It seems from discussion that the former spectrum A is produced by the argon ion beam, and that the latter spectrum B is formed by the excited argon molecules of metastable states. A brief theory is also derived for the signal intensity decrement of spectrum A due to the Coulomb force, and the agreement with experiments is fairly good.
一般社団法人日本機械学会の論文
1990-05-25