Transport implications of current drive by magnetic helicity injection

被引:26
作者
Moses, RW [1 ]
Gerwin, RA [1 ]
Schoenberg, KF [1 ]
机构
[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
关键词
D O I
10.1063/1.1407285
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
It is shown that in fusion plasma configurations sustained by electrode helicity injection, the core electron temperature (in electron volts) can, at most, be 25% to 40% of the electrode voltage (in volts). This result is obtained by assessing magnetic helicity injection as a driver of macroscopic steady-state plasma currents in magnetic confinement devices. Coaxial helicity injection using electrodes (CHI) and oscillating-field current drive (OFCD) are compared to inductive current drive. Magnetic helicity, K, is uniquely defined as the time-dependent volume integral of A.B when the surface components of A are purely solenoidal. Using an Ohm's law including Hall terms, magnetic helicity transport modeling shows that no closed magnetic surfaces with time and volume averaged parallel currents can exist continuously within a plasma sustained only by CHI or OFCD. The 25% to 40% limitations are obtained by considering long and short electron mean-free-path models of parallel energy transport. (C) 2001 American Institute of Physics.
引用
收藏
页码:4839 / 4848
页数:10
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