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Comparison of TRANSP-evolved q-profiles with MSE constrained equilibrium fits on JET

D J Kelliher, N C Hawkes, P J Mc Carthy, contributors to the EFDA-JET Workprogramme2005年Plasma Physics and Controlled FusionIF 2.2出版社

The pitch angle predicted by the transport analysis code TRANSP was compared with motional Stark effect (MSE) data. TRANSP was initialized in the early ramp-up phase using a measured pitch angle profile but evolved its current profile thereafter using the magnetic field diffusion equation. The comparison was carried out over a wide range of pulses, including cases where a current hole was established in the pre-heating phase. Besides confirming that a neoclassical model of the resistivity is superior to the classical one in modelling the evolution of the current profile in JET, the results also indicate that the TRANSP prediction is nearly always within the 95% confidence band of the MSE data. In addition, it is shown that the TRANSP q-profile is consistent with MHD data and Faraday rotation polarimetry data. The results presented here underpin the accuracy of the current profile predicted by a well-diagnosed TRANSP run.

日本語訳

TRANSPコードによって予測されたピッチ角を、モーションル・シュタルク効果(MSE)データと比較した。TRANSPは、立ち上げ初期段階において測定されたピッチ角分布を用いて初期化されたが、その後は磁場拡散方程式を用いて電流分布を時間発展させた。この比較は、予備加熱段階で電流ホールが形成されたケースを含む広範囲のパルスにわたって実施された。この結果は、ジュール電流分布の時間発展のモデル化において、新古典論的抵抗率モデルが古典論的モデルよりも優れていることを確認しただけでなく、TRANSPによる予測がMSEデータの95%信頼区間内にほぼ常に収まることも示している。さらに、TRANSPによって計算されたq分布がMHDデータおよびファラデー回転偏光計データと整合することも示された。ここで提示された結果は、十分に診断されたTRANSPランによって予測される電流分布の精度を裏付けるものである。

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