一种从环形旋转中的极向不对称性确定极向旋转的方法（特邀报告）

A method for determining poloidal rotation from poloidal asymmetry in toroidal rotation (invited).

作者信息

Chrystal C, Burrell K H, Grierson B A, Lao L L, Pace D C

机构信息

Department of Physics, University of California-San Diego, 9500 Gilman Dr., La Jolla, California 92093, USA.

General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA.

出版信息

Rev Sci Instrum. 2014 Nov;85(11):11E302. doi: 10.1063/1.4891601.

DOI:10.1063/1.4891601

PMID:25430307

Abstract

A new diagnostic has been developed on DIII-D that determines the impurity poloidal rotation from the poloidal asymmetry in the toroidal angular rotation velocity. This asymmetry is measured with recently added tangential charge exchange viewchords on the high-field side of the tokamak midplane. Measurements are made on co- and counter-current neutral beams, allowing the charge exchange cross section effect to be measured and eliminating the need for atomic physics calculations. The diagnostic implementation on DIII-D restricts the measurement range to the core (r/a < 0.6) where, relative to measurements made with the vertical charge exchange system, the spatial resolution is improved. Significant physics results have been obtained with this new diagnostic; for example, poloidal rotation measurements that significantly exceed neoclassical predictions.

摘要

在DIII-D装置上开发了一种新的诊断方法，该方法可根据环向角旋转速度的极向不对称性来确定杂质的极向旋转。这种不对称性是通过最近在托卡马克中平面高场侧增加的切向电荷交换视向线来测量的。对共流和反流中性束进行测量，从而能够测量电荷交换截面效应，无需进行原子物理计算。DIII-D装置上的这种诊断方法将测量范围限制在核心区域（r/a < 0.6），相对于使用垂直电荷交换系统进行的测量，其空间分辨率有所提高。使用这种新的诊断方法已经获得了重要的物理结果；例如，极向旋转测量结果显著超过新经典理论的预测。