Edge transport barrier formation studies on JET with the JETTO code
Edge transport barrier formation studies on JET with the JETTO code
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DOI：
10.1088/0029-5515/48/8/085006
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发表时间：
2008-08
期刊：
影响因子：
3.3
通讯作者：
D. Kalupin;S. Wiesen;Y. Andrew;M. Tokar;V. Parail;D. Reiser;G. Corrigan;A. Korotkov;J. Spence
中科院分区：
文献类型：
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作者：
D. Kalupin;S. Wiesen;Y. Andrew;M. Tokar;V. Parail;D. Reiser;G. Corrigan;A. Korotkov;J. Spence
1.5D 输运代码 JETTO（Cenacchi G. 和 Taroni A. 1988 Rapporto ENEA RT/TIB (88)5）已应用于模拟 JET 托卡马克从低约束模式（L）到高约束模式（H 模式）的转变。 JET 上 L-H 跃迁所需的临界功率 Pth 的计算值直接与线平均密度和磁场扫描的实验（Andrew Y. et al 2006 Plasma Phys. Control. Fusion 48 479）进行比较。在考虑的所有密度（包括低密度放电）中，计算和实验之间发现了合理的一致性，其中 Pth 随着密度的降低而增加。 Pth(ne) 依赖性的最小值可以通过粒子对流对边缘热损失的贡献增强来解释。较高的对流损失会导致较低的温度及其梯度，因此 L-H 转变需要更多的功率。对不同磁场的 JET 放电进行的计算显示与实验大致一致，尽管如此，计算和实验功率阈值均远高于机器间标度预测（ITPA H 模式功率阈值数据库工作组由 Takizuka T. 2004 Plasma Phys. and Control. Fusion 46 A227 提出，Snipes J.A. 等人 2002 Proc. 19th Int. Conf. on聚变能源 2002（法国里昂，2002 年）。
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 al 2006 Plasma Phys. Control. Fusion 48 479) 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. Fusion 46 A227, Snipes J.A. et al 2002 Proc. 19th Int. Conf. on Fusion Energy 2002 (Lyon, France, 2002)).