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Improvement of uniformity of the negative ion beams by Tent-shaped magnetic field in the JT-60 negative ion source

テント型磁場配位によるJT-60負イオン源の負イオンビームの一様性の改善

吉田 雅史; 花田 磨砂也; 小島 有志; 柏木 美恵子; Grisham, L. R.*; 秋野 昇; 遠藤 安栄; 小又 将夫; 藻垣 和彦; 根本 修司; 大関 正弘; 関 則和; 佐々木 駿一; 清水 達夫; 照沼 勇斗

Yoshida, Masafumi; Hanada, Masaya; Kojima, Atsushi; Kashiwagi, Mieko; Grisham, L. R.*; Akino, Noboru; Endo, Yasuei; Komata, Masao; Mogaki, Kazuhiko; Nemoto, Shuji; Ozeki, Masahiro; Seki, Norikatsu; Sasaki, Shunichi; Shimizu, Tatsuo; Terunuma, Yuto

負イオン中性入射装置では、JT-60SAにて要求される22Aの大電流を生成するために、負イオン源内の負イオンビームの一様性を改善する必要がある。本研究では、イオン源の磁場構造を従来のカスプ磁場配位からテント型磁場配位に改良した。磁場構造を改良することによって、負イオンビームの一様性を負イオンの生成効率を劣化させることなく、10%以下に改善することができた。

Non-uniformity of the negative ion beams in the JT-60 negative ion source was improved by modifying an external magnetic field to a tent-shaped magnetic field for reduction of the local heat loads in the source. Distributions of the source plasmas (H$$^{+}$$ ions and H$$^{0}$$ atoms) of the parents of H$$^{-}$$ ions converted on the cesium covered plasma grids were measured by Langmuir probes and emission spectroscopy. Beam intensities of the H$$^{-}$$ ions extracted from the plasma grids were measured by IR camera from the back of the beam target plate. The tent-shaped magnetic field prevented the source plasmas to be localized by B $$times$$ grad B drift of the primary electrons emitted from the filaments in the arc chamber. As a result, standard derivation of the H$$^{-}$$ ions beams was reduced from 14% (the external magnetic field) to 10% (the tent-shaped magnetic field) without reduction of an activity of the H$$^{-}$$ ion production.

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パーセンタイル:46.97

分野:Instruments & Instrumentation

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