シートプラズマによる陽子加速器と熱核融合反応研究のための空間生成H-, D-イオン源 (I)

概要

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In order to apply a sheet plasma type of volume produced H-, D- ion source to injection of proton accelerators and neutral beam injection of thermo-nuclear fusion researches, a large sheet plasma of width 2025 cm and length 30 cm is produced in the discharge current of 175 A, H2 or D2 gas pressure of about 2.5×10-3 Torr and gas flow of (2.02.5) Torr l/sec in magnetic field of (60110) gauss. Thus, H- or D- ion currents are extracted in current densities up to 19 mA/cm2 or 16 mA respectively, which are uniform within 10% over the large area (above 250 cm2) of the sheet plasma surface, and for the acceleration voltage up to 4.5 kV. Electron current accelerated with H- or D- ions becomes neglisible beyond a distance of 2cm from the final acceleration electrode.