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자료유형
학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제36권 제4호
발행연도
2004.1
수록면
357 - 363 (7page)

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A prototype long pulse ion source was developed, and the beam extraction experiments of theion source were carried out at the Neutral Beam Test Stand (NBTS) of the Korea SuperconductingTokamak Advanced Research (KSTAR). The ion source consists of a magnetic bucket plasmagenerator, with multi-pole cusp fields, and a set of tetrode accelerators with circular apertures.Design requirements for the ion source were a 120 kV/65 A deuterium beam and a 300 s pulselength. Arc discharges of the plasma generator were controlled by using the emission-limited mode,in turn controlled by the applied heating voltage of the cathode filaments. Stable and efficient arcplasmas with a maximum arc power of 100 kW were produced using the constant power modeoperation of an arc power supply. A maximum ion density of 8.3×1011 cm-3 was obtained byusing electrostatic probes, and an optimum arc efficiency of 0.46 A/kW was estimated. Theaccelerating and decelerating voltages were applied repeatedly, using the re-triggering modeoperation of the high voltage switches during a beam pulse, when beam disruptions occurred. Thedecelerating voltage was always applied prior to the accelerating voltage, to suppress effectively theback-streaming electrons produced at the time of an initial beam formation, by the pre-programmed fast-switch control system. A maximum beam power of 0.9 MW (i.e. 70 kV×12.5A) with hydrogen was measured for a pulse duration of 0.8 s. Optimum beam perveance, deducedfrom the ratio of the gradient grid current to the total beam current, was 0.7 perv. Stable beamsfor a long pulse duration of 5~10 s were tested at low accelerating voltages.

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