Neoclassical MHD Equilibria with Ohmic Current
Neoclassical MHD Equilibria with Ohmic Current
复制标题
新古典 MHD 与欧姆电流的平衡
DOI：
10.1143/jpsj.58.871
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发表时间：
1989
影响因子：
1.7
通讯作者：
M. Okamoto
中科院分区：
文献类型：
--
作者：
S. Tokuda;T. Takeda;M. Okamoto
自洽地计算了具有新经典电流效应（新经典电导率和自举电流）的托卡马克等离子体的MHD平衡。研究了欧姆电流维持下JFT-2 M托卡马克等离子体的新经典效应。对于L型平衡，自举电流很小，因为极向β，β J的可达到值很低。H型平衡给出了JFT-2 M获得的β J为30%欧姆电流的自举电流和β J ≥1.5时为100%的自举电流，这两种电流都足以改变电流分布和由此产生的MHD平衡。新古典电导率约为经典Spitzer电导率的一半，在磁轴处产生峰值欧姆电流分布，产生低安全系数。新古典电导率降低了有效Z（Z eff）的值，这是给出所观察到的单匝电压所必需的，但是当没有观察到这样的峰值电流分布时，它需要在中心处积累杂质。
MHD equilibria of tokamak plasmas with neoclassical current effects (neoclassical conductivity and bootstrap current) were calculated self-consistently. Neoclassical effects on JFT-2M tokamak plasmas, sustained by ohmic currents, were studied. Bootstrap currents flow little for L-mode type equilibria because of low attainable values of poloidal beta, β J . H-mode type equilibria give bootstrap currents of 30% ohmic currents for β J attained by JFT-2M and 100% for β J ≥1.5, both of which are sufficient to change the current profiles and the resultant MHD equilibria. Neoclassical conductivity whicla has roughly half value of the classical Spitzer conductivity brings peaked ohmic current profiles to yield low safety factor at the magnetic axis. Neoclassical conductivity reduces the value of effective Z ( Z eff ) which is necessary to give the observed one-turn voltage but it needs impurities accumulating at the center when such peaked current profiles are not observed.