Attaining neoclassical transport in ignited tokamaks

被引:51
作者
Kotschenreuther, M [1 ]
Dorland, W
Liu, QP
Zarnstorff, MC
Miller, RL
Lin-Liu, YR
机构
[1] Univ Texas, Inst Fus Studies, Austin, TX 78712 USA
[2] Univ Maryland, Inst Plasma Phys, College Pk, MD 20742 USA
[3] Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA
[4] Gen Atom Co, San Diego, CA USA
关键词
D O I
10.1088/0029-5515/40/3Y/331
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
The requirements to stabilize microinstabilities with velocity shear in tokamaks are examined for both aspect ratio A = 3 and A = 1.4. A comprehensive linear gyrokinetic code is used to compute growth rates in realistic numerical equilibria. Growth rates for A = 3 and A = 1.4 are generally similar for electron drift modes and ion temperature gradient modes. Velocity shear is stronger at low aspect ratio; how-ever, low A profiles have a stronger microtearing mode which is more difficult to shear stabilize. Nonetheless, low aspect ratio devices are predicted to have good confinement and may ignite at very small size. Profiles are presented which may allow high beta, MHD stable operation at A = 1.4 with high confinement. The possibility of using a controlled application of non-turbulent loss processes to control profiles to prevent turbulent transport and to maximize beta is suggested.
引用
收藏
页码:677 / 684
页数:8
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