The magnetic shear effect on thermal electron transport is studied in a large variety of non-inductive plasmas in Tore Supra. An improved confinement in the region of low and negative shear was observed and quantified with an exponential dependence on the magnetic shear (Litaudon, et al., Fusion Energy 1996 (Proc. 16th Int; Conf. Montreal, 1996), vol. 1, IAEA, Vienna (1997) 669). This is interpreted as a consequence of a decoupling of the global modes (Romanelli and Zonca, Phys. Fluids B 5 (1993) 4081) that are thought to be responsible for anomalous transport. This dependence is proposed in order to complete the Bohm-like L mode local electron thermal diffusivity so as to describe the transition from Bohm-like to gyroBohm transport in the plasma core. The good agreement between the predictive simulations of the different Tore Supra regimes (hot core lower hybrid enhanced performance, reversed shear plasmas and combined lower hybrid current drive and fast wave electron heating) and experimental data provides a basis for extrapolation of this magnetic shear dependence in the local transport coefficients to future machines. As an example, a scenario for non-inductive current profile optimization and control in ITER is presented
磁剪切效应对热电子输运的影响在Tore Supra装置的大量非感应等离子体中被研究。在低剪切和负剪切区域观察到约束改善，并定量给出了其与磁剪切的指数依赖关系（Litaudon等人，Fusion Energy 1996 (Proc. 16th Int. Conf. Montreal, 1996)，第1卷，IAEA，维也纳（1997）第669页）。这被解释为被认为是反常输运原因的全局模解耦的结果（Romanelli和Zonca，Phys. Fluids B 5 (1993) 4081）。为了描述从类Bohm输运到陀螺Bohm输运在等离子体芯部的转变，提出了这种依赖关系以完善类Bohm的L模局部电子热扩散系数。对不同Tore Supra运行模式（热芯部低混杂波增强性能、反剪切等离子体以及低混杂波电流驱动与快波电子加热的组合）的预测模拟与实验数据之间的良好一致性，为将这种磁剪切依赖关系外推到局部输运系数至未来装置提供了基础。作为示例，给出了ITER中非感应电流剖面优化与控制的方案。