arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1302.7052physics.plasm-ph
收藏

EXTRAP-T2R反场箍缩中稳定外扭结驱动旋转的误差场估计

Error Field Assessment from Driven Rotation of Stable External Kinks at EXTRAP-T2R Reversed Field Pinch

F. A. Volpe, L. Frassinetti, P. R. Brunsell, J. R. Drake, K. E. J. Olofsson

摘要:

一种新的非破坏性误差场(EF)评估技术不限于低密度,因此低β在EXTRAP-T2R反向场箍缩证明。稳定和边缘稳定的环形模式数n = 10和n = 8,分别产生的外部扭结模式,和他们的旋转持续,通过相同的n旋转磁扰动。由于有限的EF,尽管施加的扰动均匀旋转,并具有恒定的振幅,扭结模式被观察到旋转不均匀,并在振幅调制。该行为用于精确推断EF的幅度并近似估计EF的环形相位。随后的扫描允许优化环形相位。该技术进行了测试,故意施加以及内在的错误字段n = 8和10。应用与估计误差场相等和相反的校正。误差补偿的功效由响应于均匀旋转扰动的增加的放电持续时间和更均匀的模式旋转指示。结果与理论符合良好,并讨论了低n,撕裂模和托卡马克,包括ITER的扩展。

英文摘要:

A new non-disruptive error field (EF) assessment technique not restricted to low density and thus low beta was demonstrated at the EXTRAP-T2R reversed field pinch. Stable and marginally stable external kink modes of toroidal mode number n=10 and n=8, respectively, were generated, and their rotation sustained, by means of rotating magnetic perturbations of the same n. Due to finite EFs, and in spite of the applied perturbations rotating uniformly and having constant amplitude, the kink modes were observed to rotate non-uniformly and be modulated in amplitude. This behavior was used to precisely infer the amplitude and approximately estimate the toroidal phase of the EF. A subsequent scan permitted to optimize the toroidal phase. The technique was tested against deliberately applied as well as intrinsic error fields of n=8 and 10. Corrections equal and opposite to the estimated error fields were applied. The efficacy of the error compensation was indicated by the increased discharge duration and more uniform mode rotation in response to a uniformly rotating perturbation. The results are in good agreement with theory, and the extension to lower n, to tearing modes and to tokamaks, including ITER, is discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑