Confinement in W7-AS and the role of radial electric field and magnetic shear
Confinement in W7-AS and the role of radial electric field and magnetic shear
复制标题
W7-AS 中的约束以及径向电场和磁剪切的作用
DOI：
10.1088/0741-3335/39/12b/021
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发表时间：
1997
影响因子：
2.2
通讯作者：
A. Weller
中科院分区：
文献类型：
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作者：
R. Brakel;M. Anton;J. Baldzuhn;R. Burhenn;V. Erckmann;S. Fiedler;J. Geiger;H. Hartfuss;O. Heinrich;M. Hirsch;R. Jaenicke;M. Kick;G. Kühner;H. Maassberg;U. Stroth;F. Wagner;A. Weller
在强正径向电场的存在下，在低密度ECRH等离子体中心观察到改进的新古典电子约束，这类似于新古典双极性条件的电子根解，但显然是由ECRH产生的超热电子的损失驱动的。在更高的密度和NBI加热，高约束制度基本上高于ISS 95标度和不同的H-模式的建立与强烈剪切的负径向电场在边界处。等离子体电流感应的磁剪切的应用表明，约束在W7-AS基本上是由扰动高阶有理曲面。为了最佳的约束，这些共振必须避免在边界区域或磁剪切必须足够大。与其符号无关，磁剪切可以减少电子能量传输，在这种共振的存在下，电子能量传输被增强到新经典水平。
Improved neoclassical electron confinement in the centre of low-density ECRH plasmas has been observed in the presence of a strong positive radial electric field, which resembles the electron root solution of the neoclassical ambipolarity condition but is obviously driven by the loss of ECRH-generated suprathermal electrons. At higher densities and with NBI heating, a high confinement regime substantially above the ISS95-scaling and different from the H-mode is established with a strongly sheared negative radial electric field at the boundary. The application of plasma-current induced magnetic shear reveals that confinement in W7-AS is essentially determined by perturbations at high-order rational surfaces. For optimum confinement, these resonances have either to be avoided in the boundary region or magnetic shear must be sufficiently large. Independent of its sign, magnetic shear can reduce electron energy transport which is enhanced in the presence of such resonances to the neoclassical level.
伊藤公隆：等离子体物理学和受控聚变。31。（1989）
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