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High field side measurements of non-thermal electron cyclotron emission on TCV plasmas with ECH and ECCD

P Blanchard, S Alberti, S Coda, H Weisen, P Nikkola, I Klimanov2002年Plasma Physics and Controlled FusionIF 2.2出版社

Measurements of electron cyclotron emission (ECE) from the high field side of the TCV tokamak have been made on plasmas heated by second and third harmonic X-mode electron cyclotron heating (ECH) and electron cyclotron current drive (ECCD). Suprathermal ECE, up to a factor of six in excess of thermal emission, is detected in the presence of second harmonic X-mode (X2) ECCD and of third harmonic X-mode (X3) ECH. The measured ECE spectra are modelled using a bi-Maxwellian describing the bulk and the suprathermal electron populations. Suprathermal temperatures between 10 and 50 keV and densities in the range 1×1017−6×1018 m−3 are obtained, and correspond to 3–15 bulk temperatures and 1–20% bulk densities. Good agreement between ECE suprathermal temperatures and energetic photon temperatures, measured by a hard x-ray camera, is found. For optically thin X3 low field side injection in the presence of X2 CO-ECCD, the suprathermal population partly explains the discrepancy between global and first pass absorption measurements.

日本語訳

TCVトカマクの高磁場側からの電子サイクロトロン放射(ECE)の測定が、第2高調波および第3高調波Xモード電子サイクロトロン加熱(ECH)と電子サイクロトロン電流駆動(ECCD)によって加熱されたプラズマに対して行われた。熱放射を最大6倍上回る超熱的ECEが、第2高調波Xモード(X2)ECCDおよび第3高調波Xモード(X3)ECHの存在下で検出された。測定されたECEスペクトルは、バルク電子集団と超熱的電子集団を記述するバイマクスウェル分布を用いてモデル化された。超熱的電子温度は10〜50 keV、密度は1×10¹⁷〜6×10¹⁸ m⁻³の範囲で得られ、それぞれバルク温度の3〜15倍、バルク密度の1〜20%に相当する。ECEによる超熱的電子温度と、硬X線カメラで測定された高エネルギー光子温度との間には良好な一致が見られた。X2 CO-ECCDの存在下での光学的に薄いX3低磁場側入射の場合、超熱的電子集団は全球吸収測定と第一通過吸収測定の間の差異を部分的に説明する。

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Electron cyclotron heatingTCVElectron cyclotron emissionElectron cyclotron current drive
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