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Supersonic helium beam for measurement of electric field in torus plasma edges

T Katsuta, K Takiyama, T Oda, K Mizuno, T Ogawa1997年Fusion Engineering and DesignIF 1.7出版社

AbstractNumerical investigations on the basis of a collisional-radiative model have been made on the measurement of the electric field in torus plasma edges using a supersonic helium beam with aid of laser excitation. In this simulation, the laser-induced fluorescence intensity of the He I 492.2 nm line associated with the forbidden excitation due to the Stark effect is estimated as a function of electric field strength. The results show that an electric field as low as 50 V cm−1 can be measured by the supersonic beam with sufficient beam density (about 1012 cm−3). A numerical discussion is also given on the measurement of the electron temperature and density.

日本語訳

衝突放射モデルに基づく数値的検討が、超音速ヘリウムビームとレーザー励起を用いたトーラスプラズマ端部における電場測定に関して行われた。このシミュレーションでは、シュタルク効果による禁制励起に関連するHe I 492.1 nm線のレーザー誘起蛍光強度が、電場強度の関数として評価された。その結果、十分なビーム密度(約10¹² cm⁻³)を有する超音速ビームにより、50 V cm⁻¹という低い電場が測定可能であることが示された。さらに、電子温度および電子密度の測定に関する数値的考察も併せて行われた。

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