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Particle and energy transport simulations of reversed field pinch plasmas

S.A. Hokin1997年被引用 8Nuclear FusionIF 3出版社

A one dimensional (1-D) computer simulation of core particle and energy transport in the reversed field pinch (RFP) is described, which models transport driven by stochastic magnetic fluctuations along with a self-consistent calculation of the neutral atom profile. Experimental plasma parameters are reproduced using fluctuation levels in the experimental range. The positive ambipolar potential, which reduces the electron particle flux to the ion rate, provides an important additional ion heating mechanism: energy is transferred from electrons to ions as they move radially along the electric field. This, combined with classical electron-ion friction and comparatively good ion energy confinement, leads to ion temperatures matching experimental values in some cases. A simple anomalous heating model is applied, however, for simulation of high Ti values in low collisionality cases. The widely observed experimental scaling βpe ∝ (I/N)-2/3 is consistent with energy loss dominated by electron heat conduction with χe ∝ Te1/2, demonstrating the universality of magnetic fluctuation induced transport in RFPs

日本語訳

反転磁場ピンチ(RFP)におけるコアの粒子およびエネルギー輸送の一次元(1-D)コンピュータシミュレーションについて述べる。このシミュレーションは、確率的磁気揺動によって駆動される輸送を、中性原子分布の自己無撞着計算とともにモデル化する。実験範囲の揺動レベルを用いて、実験プラズマパラメータが再現される。電子粒子束をイオン粒子束の率まで低減する正の両極性電位は、重要な追加のイオン加熱機構を提供する:電子が電場に沿って径方向に移動する際に、エネルギーが電子からイオンへ輸送される。これは、古典的な電子-イオン摩擦および比較的良好なイオンエネルギー閉じ込めと相まって、場合によっては実験値に一致するイオン温度をもたらす。しかし、低衝突度の場合の高いTi値をシミュレーションするために、単純な異常加熱モデルが適用される。広く観測される実験的スケーリング βpe ∝ (I/N)-2/3 は、χe ∝ Te1/2 の電子熱伝導によって支配されるエネルギー損失と整合的であり、RFPにおける磁気揺動誘起輸送の普遍性を示している。

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Reversed field pinchPinch plasma
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