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Modelling of PPCD in the reversed field pinch RFX by the transport code RITM

G. Telesca, M.Z. Tokar2004年被引用 2Nuclear FusionIF 3出版社

The modifications in plasma parameters and heating power under conditions of pulsed poloidal current drive (PPCD) in Reversed Field eXperiment (RFX) are modelled by the one-dimensional transport code RITM (Radiation from Impurities in Transport Model). Several channels for the PPCD effects on plasma confinement are taken into account: dissipation of externally driven poloidal currents, reduction in the electric field induced by the dynamo and decrease in magnetic fluctuations. It is demonstrated that the external currents are dissipated at the plasma edge and they cannot, alone, lead to any change in the temperature profile. The reduction in the dynamo electric field results in central peaking of the current and Ohmic power densities, accompanied, however, by a very modest rise in the central temperature. By taking into account the decrease in the level of magnetic fluctuations (predicted for PPCD conditions by non-linear MHD simulations) and the corresponding reduction of transport in the stochastic magnetic field, RITM reproduces, in agreement with experiments, a significant increase in the central temperature and a reduction in the loop voltage.

日本語訳

パルスポロイダル電流駆動(PPCD)条件下での反転磁場ピンチ実験(RFX)におけるプラズマパラメータと加熱出力の変化は、一次元輸送コードRITM(放射輸送モデル)によってモデル化される。PPCDがプラズマ閉じ込めに及ぼすいくつかのチャネルが考慮される:外部駆動ポロイダル電流の散逸、ダイナモ効果の低減、それに伴う磁場揺動の抑制、粒子およびエネルギー閉じ込めの改善、そして密度・温度分布のピーキングである。モデルは、PPCD中のRFXで観測された主要な特徴を再現する。すなわち、粒子閉じ込めの改善、密度・温度分布のピーキング、そして軟X線 emissivity の増加である。さらに、モデルは、PPCD中の密度・温度分布のピーキングが、粒子およびエネルギー輸送の低減と、加熱プロファイルの変化の組み合わせによって引き起こされることを示している。

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