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Localized bulk electron heating with ICRF mode conversion in the JET tokamak

M.J. Mantsinen, M.-L. Mayoral, D. Van Eester, B. Alper, R. Barnsley, P. Beaumont, J. Bucalossi, I. Coffey, S. Conroy, M. de Baar2004年被引用 47Nuclear FusionIF 3出版社

Ion cyclotron resonance frequencies (ICRF) mode conversion has been developed for localized on-axis and off-axis bulk electron heating on the JET tokamak. The fast magnetosonic waves launched from the low-field side ICRF antennas are mode-converted to short-wavelength waves on the high-field side of the 3He ion cyclotron resonance layer in D and 4He plasmas and subsequently damped on the bulk electrons. The resulting electron power deposition, measured using ICRF power modulation, is narrow with a typical full-width at half-maximum of ≈30 cm (i.e. about 30% of the minor radius) and the total deposited power to electrons comprises at least up to 80% of the applied ICRF power. The ICRF mode conversion power deposition has been kept constant using 3He bleed throughout the ICRF phase with a typical duration of 4–6 s, i.e. 15–40 energy confinement times. Using waves propagating in the counter-current direction minimizes competing ion damping in the presence of co-injected deuterium beam ions.

日本語訳

イオンサイクロトロン共鳴周波数(ICRF)モード変換は、JETトカマクにおける局所的なオン軸およびオフ軸のバルク電子加熱のために開発された。低磁場側のICRFアンテナから放射された高速磁気音波は、Dおよび4Heプラズマ中の3Heイオンサイクロトロン共鳴層の高磁場側で短波長波にモード変換され、その後バルク電子に減衰する。ICRFパワー変調を用いて測定された結果的な電子パワー堆積は、典型的な半値全幅が約30cm(すなわち、小半径の約30%)と狭く、電子への総堆積パワーは印加ICRFパワーの少なくとも80%に達する。ICRFモード変換パワー堆積は、典型的な持続時間4〜6秒(すなわち、15〜40のエネルギー閉じ込め時間)の間、ICRFフェーズ全体を通じて3Heブリードを用いて一定に維持された。同方向に注入された重水素ビームイオンの存在下での競合するイオン減衰を最小化するために、反方向に伝播する波が使用された。

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JETIon cyclotron heatingMode conversionElectron heating
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