GYROKINETIC ANALYSIS OF ION TEMPERATURE-GRADIENT MODES IN THE PRESENCE OF SHEARED FLOWS

被引:66
作者
ARTUN, M
TANG, WM
机构
[1] Princeton Plasma Physics Laboratory, Princeton University, Princeton
来源
PHYSICS OF FLUIDS B-PLASMA PHYSICS | 1992年 / 4卷 / 05期
关键词
D O I
10.1063/1.860118
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 linearized gyrokinetic equation governing electrostatic microinstabilities in the presence of sheared equilibrium flows in both the z and y directions has been systematically derived for a sheared slab geometry, where in the large-aspect-ratio limit z and y directions correspond to the toroidal and poloidal directions, respectively. In the familiar long perpendicular wavelength regime (k(perpendicular-to)rho(i) < 1), the analysis leads to a comprehensive kinetic differential eigenmode equation that is solved numerically. The numerical results have been successfully cross-checked against analytic estimates in the fluid limit. For typical conditions, the ion temperature gradient (eta(i)) modes are found to be stabilized for y direction flows with a velocity shear scale comparable to that of the ion temperature gradient and velocities of a few percent of the sound speed. Sheared flows in the z direction taken alone are usually destabilizing, with the effect being independent of the sign of the flow. However, when both types are simultaneously considered, it is found that in the presence of sheared z-direction flow, sheared y-direction flow can be either stabilizing or destabilizing depending on the relative sign of these flows. However, for sufficiently large values of v(y)' the mode is completely stabilized regardless of the sign of v(z)'v(y)'. The importance of a proper kinetic treatment of this problem is supported by comparisons with fluid estimates. In particular, when such effects are favorable, significantly smaller values of sheared y-direction flow are required for stability than fluid estimates would indicate.
引用
收藏
页码:1102 / 1114
页数:13
相关论文
共 17 条
  • [1] PHYSICS OF THE L TO H TRANSITION IN THE DIII-D TOKAMAK
    BURRELL, KH
    CARLSTROM, TN
    DOYLE, EJ
    GOHIL, P
    GROEBNER, RJ
    LEHECKA, T
    LUHMANN, NC
    MATSUMOTO, H
    OSBORNE, TH
    PEEBLES, WA
    PHILIPONA, R
    [J]. PHYSICS OF FLUIDS B-PLASMA PHYSICS, 1990, 2 (06): : 1405 - 1410
  • [2] GENERALIZED GYROKINETICS
    CATTO, PJ
    TANG, WM
    BALDWIN, DE
    [J]. PLASMA PHYSICS AND CONTROLLED FUSION, 1981, 23 (07) : 639 - 650
  • [3] ION-TRANSPORT IN TOROIDALLY ROTATING TOKAMAK PLASMAS
    CATTO, PJ
    BERNSTEIN, IB
    TESSAROTTO, M
    [J]. PHYSICS OF FLUIDS, 1987, 30 (09) : 2784 - 2795
  • [4] LINEARIZED GYRO-KINETICS
    CATTO, PJ
    [J]. PLASMA PHYSICS AND CONTROLLED FUSION, 1978, 20 (07) : 719 - 722
  • [5] CHEN L, 1987, WORLD SCI LECTURE NO, V12
  • [6] COWLEY SC, COMMUNICATION
  • [7] FINITE BETA-EFFECTS ON ION TEMPERATURE-GRADIENT DRIVEN MODES
    DONG, JQ
    GUZDAR, PN
    LEE, YC
    [J]. PHYSICS OF FLUIDS, 1987, 30 (09) : 2694 - 2702
  • [8] GOWERS C, 1988, 15TH P EUR C CONTR B, V12, P2239
  • [9] ROLE OF EDGE ELECTRIC-FIELD AND POLOIDAL ROTATION IN THE L-H TRANSITION
    GROEBNER, RJ
    BURRELL, KH
    SERAYDARIAN, RP
    [J]. PHYSICAL REVIEW LETTERS, 1990, 64 (25) : 3015 - 3018
  • [10] HAHN TS, 1988, PHYS FLUIDS, V31, P1185