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Characterization of the electron distribution function in an electron-cyclotron driven toroidal plasma

M Podestá, A Diallo, A Fasoli, I Furno, B Labit, S H Müller, F M Poli2007年Plasma Physics and Controlled FusionIF 2.2出版社

The local properties of the electron energy distribution function are investigated in the electron-cyclotron wave driven toroidal device TORPEX (Fasoli et al 2006 Phys. Plasmas13 055902). The electron energy distribution function is measured by means of a time-resolved electrostatic energy analyser. The measurements indicate that electrons are accelerated to different energies at the electron-cyclotron and upper-hybrid resonances. Electrons from the upper-hybrid resonance have higher energies and can be described by a secondary maxwellian energy distribution function. The electron energy distribution function is found to be invariant with respect to experimental parameters such as the neutral gas pressure, the magnetic field configuration and the injected microwave power. The implications for a correct modelling of the particle source term for TORPEX plasmas are discussed.

日本語訳

電子サイクロトロン波駆動トーラス装置TORPEX(Fasoliら 2006 Phys. Plasmas 13 055902)において、電子エネルギー分布関数の局所的特性を調査した。電子エネルギー分布関数は、時間分解静電エネルギー分析器を用いて測定された。測定結果は、電子が電子サイクロトロン共鳴および上部ハイブリッド共鳴において異なるエネルギーに加速されることを示している。上部ハイブリッド共鳴からの電子はより高いエネルギーを有し、二次マクスウェル型エネルギー分布関数によって記述できることが明らかになった。電子エネルギー分布関数は、中性ガス圧力、磁場配位、入射マイクロ波パワーなどの実験パラメータに対して不変であることが見出された。TORPEXプラズマにおける粒子源項の正確なモデリングへの影響について議論する。

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