Energy transport during off-axis neutral beam heating in the DIII-D tokamak

被引：20

作者：

Gohil, P ^{[1
]}

Burrell, KH ^{[1
]}

Osborne, TH ^{[1
]}

机构：

[1] Gen Atom Co, San Diego, CA 92138 USA

来源：

NUCLEAR FUSION | 1998年 / 38卷 / 03期

关键词：

D O I：

10.1088/0029-5515/38/3/309

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：

Energy transport in discharges with off-axis neutral beam injection (NBI) has been compared with transport in similar discharges with on-axis NBI. A two fluid power balance analysis assuming purely diffusive transport indicates substantial improvements in the plasma centre in both the ion and the electron channels during off-axis NBI. The ion thermal diffusivity, chi(i), and the angular momentum diffusivity, chi(phi), in the plasma centre improve by over 2 orders of magnitude, and chi(i) decreases below the Chang-Hinton neoclassical level. A detailed error analysis of the energy transport has been carried out. The electron thermal diffusivity in the plasma centre improves by an order of magnitude during off-axis NBI. The predicted peak ion temperature, assuming the same ion diffusivity profile for off-axis NBI as with on-axis NBI, is nearly a factor of 2 lower than the measured ion temperature profile with off-axis NBI. In addition, assuming unchanged diffusivities, significant inward energy flow is required to explain the observed ion temperature profiles during off-axis NBI.

引用

页码：425 / 436

页数：12

共 22 条

[1] Improved operation of the Michelson interferometer electron cyclotron emission diagnostic on DIII-D [J].