DETAILED INVESTIGATION OF THE VACUUM MAGNETIC-SURFACES ON THE W7-AS STELLARATOR
DETAILED INVESTIGATION OF THE VACUUM MAGNETIC-SURFACES ON THE W7-AS STELLARATOR
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DOI：
10.1088/0029-5515/33/5/i02
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发表时间：
1993-05-01
期刊：
影响因子：
3.3
通讯作者：
SCHWORER, K
中科院分区：
文献类型：
--
作者：
JAENICKE, R;ASCASIBAR, E;SCHWORER, K
荧光棒技术是一种新的、灵敏的实验方法，用于测量环形约束装置中的真空磁面。在开始等离子体实验之前，将其应用于模块化低剪切W7-AS星光仪。磁岛宽度可以记录到小于等离子体半径的5%，这是由低至10(-5)的相对微扰场引起的。当转动变换t值在1/4和2/3之间时，得到了共振微扰场分量的几乎完全的傅里叶谱。在W7-AS上得到的结果再次证明了磁岛的存在是环形约束装置中的一种常见现象，并且输运理论中闭合、嵌套的磁通面的假设并不总是合理的。根据测量的微扰场谱，用一个简单的输运模型估算了真空场孤岛对径向输运的增强作用。将模型的预测值与W7-As中抗磁能含量与t的实验关系进行了比较。
The fluorescent rod technique is a rather new and sensitive method of experimentally mapping vacuum magnetic surfaces in toroidal confinement devices. It was applied to the modular low shear W7-AS stellarator before starting plasma experiments. Magnetic island widths down to less than 5% of the plasma radius could be recorded, these being caused by relative perturbation field amplitudes of down to 10(-5). The almost complete Fourier spectrum of the resonant perturbation field components is derived for values of the rotational transform t between 1/4 and 2/3. The results obtained on W7-AS demonstrate once more that the existence of magnetic islands is a common phenomenon in toroidal confinement devices, and that the assumption of closed, nested flux surfaces in transport theories may not always be justified. On the basis of the measured perturbation field spectrum, the enhancement of the radial transport caused by the vacuum field islands is estimated with a simple transport model. The predictions of the model are compared with the experimental dependence of the diamagnetic energy content on t in W7-AS.