セシウムを添加したマイクロ波イオン源からの水素負イオンビームの引き出し(<特集>負イオン特集)

概要

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A microwave ion source has been developed for negative-ion-based neutral beam injection (NBI). The plasma generator in the test source is a 15 cm-diameter, 16.5 cm-long cylindrical chamber. The microwave power (2.45 GHz) is introduced into the chamber through a ceramic window and a rectangular waveguide, both biased positively with respect to the chamber. The reflected microwave power is effectively reduced by biasing the waveguide and window in this way. A negative hydrogen ion beam with a current density of 10.4 mA/cm^2 has been extracted at an operating pressure of 0.36 Pa with cesium seeding, where the net microwave power introduced into the chamber was 3.9 kW. The plasma generator has been operated continuously for almost one hour with the negative ion beam being extracted intermittently at a current density of 8.7 mA/cm^2. The ion source operated steadily and the fluctuation in current density was less than 0.70% during this period.
社団法人プラズマ・核融合学会の論文
1996-11-25