Effects of oscillating poloidal current drive on magnetic relaxation in the Madison Symmetric Torus reversed-field pinch

被引：0
|
作者：
Li, Zichao [1 ,2 ]
McCollam, K. J. [3 ]
Nishizawa, T. [3 ]
Parke, E. [3 ]
Sarff, J. S. [3 ]
Xing, Z. A. [3 ]
Li, Hong [1 ,2 ]
Liu, Wandong [1 ,2 ]
Ding, Weixing [1 ,2 ]
机构：
[1] Univ Sci & Technol China, KTX Lab, Hefei 230026, Anhui, Peoples R China
[2] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China
[3] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
来源：
PLASMA PHYSICS AND CONTROLLED FUSION | 2019年 / 61卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Madison Symmetric Torus (MST); reversed-field pinch (RFP); oscillating poloidal current drive (OPCD); magnetohydrodynamics (MHD); magnetic reconnection; magnetic self-organization; ion heating; CURRENT PROFILE CONTROL; TRANSPORT REDUCTION; STABILITY ANALYSIS; HELICITY; CONFINEMENT; IMPROVEMENT;
D O I：
10.1088/1361-6587/aaf9e0
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
Magnetic relaxation behavior in reversed-field pinch (RFP) experiments on the Madison Symmetric Torus device is modified by oscillating poloidal current drive (OPCD). We observe that OPCD modulates the nonlinear magnetic fluctuation dynamics of the RFP as it modulates the equilibrium and its linear stability properties. In particular, OPCD can entrain the RFP's nonlinear magnetic relaxation cycle and can therefore modify the frequency of the discrete relaxation events called sawtooth crashes. These crashes, which are intermittent or quasiperiodic in standard RFP plasmas without oscillating voltages, can be entrained by OPCD to become nearly periodic. The entrainment of the RFP sawtooth cycle is investigated by varying OPCD amplitude and frequency, as well as plasma equilibrium magnetic field reversal. Impurity ion (C+4) heating induced and modulated by OPCD is measured by ion Doppler spectrometry and is ascribed to the modulation of magnetic reconnection activity.
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页数：14
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