ICRF mode conversion flow drive on Alcator C-Mod

被引：21

作者：

Lin, Y. ^{[1
]}

Rice, J. E. ^{[1
]}

Wukitch, S. J. ^{[1
]}

Reinke, M. L. ^{[1
]}

Greenwald, M. J. ^{[1
]}

Hubbard, A. E. ^{[1
]}

Marmar, E. S. ^{[1
]}

Podpaly, Y. ^{[1
]}

Porkolab, M. ^{[1
]}

Tsujii, N. ^{[1
]}

机构：

[1] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA

来源：

NUCLEAR FUSION | 2011年 / 51卷 / 06期

关键词：

ION-CYCLOTRON RANGE; TOROIDAL ROTATION; TOKAMAK PLASMA; FREQUENCIES; DISCHARGES;

D O I：

10.1088/0029-5515/51/6/063002

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：

We have carried out a detailed study of ion cyclotron range of frequency (ICRF) mode conversion (MC) flow drive on the Alcator C-Mod tokamak including its dependence on plasma and RF parameters. The flow drive efficiency is found to strongly depend on the He-3 concentration in D(He-3) plasmas, a key parameter separating the ICRF minority heating regime and MC regime. At +90 degrees antenna phasing (waves in co-I-p direction) and dipole phasing (waves symmetrical in both directions), we find that Delta V-0, the change in the core toroidal rotation velocity, is in the co-I-p direction, increases with RF power and with I-p (opposite to the 1/I-p intrinsic rotation scaling). The flow drive efficiency decreases at higher plasma density and also at higher antenna frequency. The observed flow drive efficiency in H-mode has been small due to the unfavourable density scaling. The flow drive effect at -90 degrees phasing appears to be saturated or decrease at high RF power. The up-down asymmetry in the MC to the ion cyclotron wave may be the key to understand the flow drive mechanism.

引用

页数：12

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