A numerical simulation of the L-H transition in JET with local and global models of anomalous transport
A numerical simulation of the L-H transition in JET with local and global models of anomalous transport
复制标题
使用局部和全局异常输运模型对 JET 中的 L-H 转变进行数值模拟
DOI：
10.1088/0029-5515/35/1/i08
复制
发表时间：
1995
期刊：
影响因子：
3.3
通讯作者：
A. Taroni
中科院分区：
文献类型：
--
作者：
J. Cordey;D. Muir;S. V. Neudachin;V. Parail;E. Springmann;A. Taroni
用反常输运模型对喷流中L-H跃迁的动力学进行了数值研究，该模型依赖于局域或全局等离子体参数。与实验结果的比较表明，在剪切变大的区域(例如，Q=1表面外)，当使用减少χe、χi和D的全局模型时，取得了最好的一致性。因此，L-H跃迁表现为Q=1表面外的输运系数的突然下降，而不仅仅是在靠近等离子体边缘的一个窄层中。在这种快速转变之后，等离子体约束的缓慢改善可以归因于对等离子体核中输运系数的局部等离子体参数的依赖
A numerical study of the dynamics of the L-H transition in JET was done using models of anomalous transport which depend either on local or on global plasma parameters. Comparison with experimental results shows that the best agreement is reached when using a global model for reducing χe, χi and D in the region where shear becomes large (e.g., outside the q=1 surface). Thus the L-H transition manifests itself as a sudden drop of the transport coefficients everywhere outside the q=1 surface, not only in a narrow layer near the plasma edge. The slow improvement of plasma confinement which follows such a fast transition could then be attributed to the dependence on the local plasma parameters of the transport coefficients in the plasma core