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Comparison of particle transport properties in TPE-RX standard and PPCD plasmas

F Auriemma, Y Hirano, H Koguchi, A Canton, P Innocente, R Lorenzini, M E Puiatti, D Terranova, H Sakakita2009年Plasma Physics and Controlled FusionIF 2.2出版社

The global transport properties of a magnetic confinement device are strongly affected by the level of magnetic and electrostatic fluctuations. Transport in the plasma core of low current (Ip ⩽ 0.6 MA) reversed field pinch devices is driven mainly by magnetic chaos associated with the presence of several MHD modes. In order to reduce the magnetic chaos, the technique of the pulsed poloidal current drive (PPCD) (Sarff et al 1994 Phys. Rev. Lett.72 3670–3) has been applied to the TPE-RX plasma. This paper presents the comparison of the confinement properties in discharges with and without PPCD.It turns out that PPCD pulses show longer particle confinement time than standard plasmas. Moreover, for the first time, particle transport analyses have been carried out at TPE-RX both in standard and PPCD discharges to investigate the local particle diffusion coefficient. The comparison of the results confirms the strong reduction in the transport when the magnetic fluctuations are damped, in quantitative accordance with the theoretical predictions.

日本語訳

磁気閉じ込め装置の全体輸送特性は、磁気および静電揺動のレベルに強く影響される。低電流(Ip ⩽ 0.6 MA)の逆転磁場ピンチ装置におけるプラズマコアの輸送は、複数のMHDモードの存在に伴う磁気カオスによって主に駆動される。この磁気カオスを低減するため、パルス状ポロイダル電流駆動(PPCD)(Sarff et al 1994 Phys. Rev. Lett. 72 3670–3)の手法がTPE-RXプラズマに適用されてきた。本論文では、PPCDの有無による放電における閉じ込め特性の比較を示す。PPCDパルスは、標準放電よりも長い粒子閉じ込め時間を示すことが明らかになった。さらに、TPE-RXにおいて標準放電およびPPCD放電の両方で粒子輸送解析が初めて実施され、局所的な粒子拡散係数の調査が行われた。その結果の比較により、磁気揺動が抑制された際の輸送の大幅な低減が確認され、これは理論的予測と定量的に一致する。

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