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Edge transport barrier formation studies on JET with the JETTO code

D. Kalupin, S. Wiesen, Y. Andrew, M.Z. Tokar, V. Parail, D. Reiser, G. Corrigan, A. Korotkov, J. Spence, JET EFDA contributors2008年被引用 4Nuclear FusionIF 3出版社

The 1.5D transport code JETTO (Cenacchi G. and Taroni A. 1988 Rapporto ENEA RT/TIB (88)5) has been applied to model the transition from the low (L) to the high confinement mode (H-mode) in the JET tokamak. Computed values of the critical power, Pth, required for the L–H transition on JET are directly compared with experiment (Andrew Y. et al2006 Plasma Phys. Control. Fusion48 479) across line averaged density and magnetic field scans. Reasonable agreement is found between computations and experiment across all densities considered, including low density discharges, where Pth increases with decreasing density. The minimum of Pth(ne) dependence is explained by the enhanced contribution of the particle convection to heat losses at the edge. Higher convective losses result in lower temperature and its gradient, and therefore more power is required for the L–H transition. Computations performed for JET discharges with varied magnetic field show a rough agreement with the experiment, nonetheless both computed and experimental power thresholds are substantially higher than the inter-machine scaling predictions (ITPA H-mode Power Threshold Database Working Group Presented by Takizuka T. 2004 Plasma Phys. and Control. Fusion46 A227, Snipes J.A. et al 2002 Proc. 19th Int. Conf. on Fusion Energy 2002 (Lyon, France, 2002)).

日本語訳

1.5D輸送コードJETTO(Cenacchi G. and Taroni A. 1988 Rapporto ENEA RT/TIB (88)5)を、JETトカマクにおける低閉じ込めモード(Lモード)から高閉じ込めモード(Hモード)への遷移のモデリングに適用した。JETにおけるL–H遷移に必要な臨界パワーPthの計算値は、線平均密度および磁場スキャンにわたって実験(Andrew Y. et al 2006 Plasma Phys. Control. Fusion48 479)と直接比較される。計算と実験の間には、低密度放電を含むすべての考慮された密度にわたって合理的な一致が見られ、低密度ではPthは密度の減少とともに増加する。Pth(ne)依存性の最小値は、端部における熱損失に対する粒子対流の寄与の増加によって説明される。より高い対流損失はより低い温度とその勾配をもたらし、したがってL–H遷移により多くのパワーが必要となる。磁場を変化させたJET放電に対して実行された計算は、実験とおおよその一致を示すが、それにもかかわらず、計算および実験の両方のパワー閾値は、装置間スケーリング予測(ITPA H-mode Power Threshold Database Working Group Presented by Takizuka T. 2004 Plasma Phys. and Control. Fusion46 A227, Snipes J.A. et al 2002 Proc. 19th Int. Conf. on Fusion Energy 2002 (Lyon, France, 2002))よりもかなり高い。

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