Extraction of Volume Produced H^- or D^- Ions from a Sheet Plasma II
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概要
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A development to large area H^- or D^- ion source is tried by using three extraction electrodes : The first electrode bias voltage is set near the wall potential (floating), the second electrode is set near 13% of main extraction voltage and the third electrode is the main acceleration electrode. An ion current of 13mA (3.3mA/cm^2) for H^- or 11mA (2.8mA/cm^2) for D^- at 3keV is extracted from 9 apertures of 6mmφ in 4cm^2 outside of the sheet plasma (14cm wide and 1.0cm thick) under a pressure of 7.7×10^<-4> Torr H_2 or D_2 gas and a weak magnetic field 50gauss. Then, it is noted that the corresponding electron current is suppressed below 1/10 of the H^- or D^- ion current.
- 核融合科学研究所の論文
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