Two-stage-discharge ion source.
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概要
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A two-stage-discharge ion source is proposed, in which a source plasma is produced through two stages of plasma production : first, an electron beam-plasma-discharge; second, a kind of hollow-cathode arc discharge. The first stage discharge produces a plasma containing abundant hot electrons. The plasma is then fed into the second stage, where -at a fairly low hydrogen gas pressure (P<4 m Torr)-a stable discharge is maintained by means of a cylinder electrode. This cylinder electrode, connected to its own dc power supply, effectively serves to increase the ion density and to flatten its radial distribution. The source plasma generated by the foregoing two-stage-discharge permits the extraction of a high current ion beam of increased beam perveance. When a cylinder electrode of 6.5 cm diameter was used, the plasma ion density measured in the circular area of 4 cm diameter in front of the ion extraction aperture array was of an order of 10<SUP>12</SUP> cm<SUP>-3</SUP> with a radial density fluctuation within ±0.1%. A description is given of this source, together with an analysis of the function of hot electrons on ion beam formation. A preliminary experiment on ion beam formation from this source plasma succeeded in obtaining a continuous hydrogen ion beam of 1.17 A at an extraction voltage of 30 kV, with use of multiaperture electrodes provided with seven apertures each of 9 mm diameter. The ion beam had a current density of 260 mA.DC/cm<SUP>2</SUP>.
- 一般社団法人 日本原子力学会の論文
著者
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NAITO Masao
Department of Nuclear Engineering, Faculty of Engineering, Osaka University
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Akimune Hideo
Department Of Nuclear Engineering Faculty Of Engineering Osaka University
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Naito Masao
Department Of Nuclear Engineering Faculty Of Engineering Osaka University
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Nunogaki Masanobu
Department Of Nuclear Engineering Faculty Of Engineering Osaka University
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