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Current drive with fast waves, electron cyclotron waves, and neutral injection in the DIII-D tokamak

R Prater, R A James, C C Petty, R I Pinsker, M Porkolab, F W Baity, S C Chiu, J S DeGrassie, R H Goulding, R W Harvey1993年Plasma Physics and Controlled FusionIF 2.2出版社

Current drive experiments have been performed on the DIII-D tokamak using fast waves, electron cyclotron waves, and neutral injection. Fast wave experiments were performed using a 4-strap antenna with 1 MW of power at 60 MHz. These experiments showed effective heating of electrons, with a global heating efficiency equivalent to that of neutral injection even when the single pass damping was calculated to be as small as 5%. The damping was probably due to the effect of multiple passes of the wave through the plasma. Fast wave current drive experiments were performed with a toroidally directional phasing of the antenna straps. Currents driven by fast wave current drive (FWCD) in the direction of the main plasma current of up to 100 kA were found, not including a calculated 40 kA of bootstrap current. Experiments with FWCD in the counter current direction showed little current drive. In both cases, changes in the sawtooth behavior and the internal inductance qualitatively support the measurement of FWCD. Experiments on electron cyclotron current drive have shown that 100 kA of current can be driven by 1 MW of power at 60 GHz. Calculation with a Fokker-Planck code show that electron cyclotron current drive (ECCD) can be well predicted when the effects of electron trapping and of the residual electric field are included.

日本語訳

DIII-Dトカマクにおいて、高速波、電子サイクロトロン波、および中性粒子入射を用いた電流駆動実験が実施された。高速波実験は、60MHzで1MWの電力を有する4ストラップアンテナを用いて行われた。これらの実験は、単一通過減衰がわずか5%と計算された場合でも、中性粒子入射と同等の全体加熱効率を示す効果的な電子加熱を実証した。この減衰は、プラズマ中での波の多重通過の効果によるものと考えられた。高速波電流駆動実験は、アンテナストラップのトロイダル方向位相制御を用いて実施された。主プラズマ電流方向への高速波電流駆動(FWCD)により、計算上のブートストラップ電流40kAを除いた最大100kAの電流が駆動された。逆方向へのFWCD実験では、電流駆動はほとんど見られなかった。いずれの場合も、鋸歯状振動の挙動と内部インダクタンスの変化は、FWCDの測定結果を定性的に裏付けるものであった。電子サイクロトロン電流駆動実験では、60GHzで1MWの電力により100kAの電流が駆動できることが示された。フォッカー・プランクコードによる計算では、電子捕捉効果と残留電場の効果を含めることで、電子サイクロトロン電流駆動(ECCD)を精度よく予測できることが示された。

装置

diii-d高精度(タイトル一致)

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Fusion Advanced Studies TorusDIII-DCurrent driveCyclotron waveElectron cyclotron wave
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