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MHD control and ECCD in Compass-D

T N Todd1993年Plasma Physics and Controlled FusionIF 2.2出版社

Electron cyclotron current drive experiments have been carried out in Compass-D using a power of approximately 500 kW at a frequency of 60 GHz. The fundamental resonance was used and the waves were launched from the high field side of the torus through four mirror-antennae. Significant asymmetry in the loop voltage behaviour is observed when comparing co and counter current drive cases, suggesting a driven current approximately 15 kA (in a plasma current of 130 kA). The BANDIT-3D Fokker Planck code has been used to model these discharges revealing a similar value for the predicted driven current at zero loop voltage but strong synergistic effects with the toroidal electric field at the approximately 0.4 Volts/turn typical of the experiments. This synergy appears to be sufficient to explain the inferred net 'co' current drive in most of the 'counter' current drive shots. In H-mode discharges featuring a strongly asymmetric single null separatrix configuration, discrete ELM's sometimes produce sufficient relaxation of the current profile to cause loss of vertical control, leading to vertical displacement events. Application of resonant magnetic perturbations (RMPs) of predominantly n=1 (with various low m values) is seen reliably to increase the frequency of the ELM's, although the exact mechanism underlying this effect has still to be elucidated. A real-time electronic neural network has been used for the first time for feedback control of the equilibrium in a tokamak. The neural network was used for feedback control of the plasma elongation throughout the discharge, while simultaneously monitoring the plasma vertical and horizontal position.

日本語訳

電子サイクロトロン電流駆動実験は、Compass-Dにおいて約500kWの電力、60GHzの周波数で実施された。基本共鳴が使用され、波動はトーラスの高磁場側から4つのミラーアンテナを通じて入射された。ループ電圧の挙動には、共方向と反対方向の電流駆動の場合を比較すると有意な非対称性が観測され、約15kAの駆動電流(プラズマ電流130kA中)が示唆された。BANDIT-3Dフォッカー・プランクコードを用いてこれらの放電をモデル化した結果、ゼロループ電圧における予測駆動電流は同様の値を示したが、実験で典型的な約0.4V/turnのトロイダル電場との間に強い相乗効果が認められた。この相乗効果は、反対方向の電流駆動ショットの大半において、推定される正味の共方向電流駆動を説明するのに十分であると思われる。強い非対称性を持つ単一ヌルセパラトリクス形状を特徴とするHモード放電では、個々のELMが電流分布の緩和を十分に引き起こし、垂直位置制御の喪失をもたらし、垂直変位事象に至る場合があった。主としてn=1(様々な低いm値を伴う)の共鳴磁場摂動(RMP)の印加は、ELMの頻度を確実に増加させることが観測されたが、この効果の背後にある正確なメカニズムはまだ解明されていない。実時間電子ニューラルネットワークが、トカマクにおける平衡のフィードバック制御のために初めて使用された。このニューラルネットワークは、放電全体を通じてプラズマの垂直位置と水平位置を同時に監視しながら、プラズマの伸長度のフィードバック制御に使用された。

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MagnetohydrodynamicsElectron cyclotron current driveCOMPASS
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