Intense Geodesic Acousticlike Modes Driven by Suprathermal Ions in a Tokamak Plasma

被引：143

作者：

Nazikian, R. ^{[1
]}

Fu, G. Y. ^{[1
]}

Austin, M. E. ^{[2
]}

Berk, H. L. ^{[2
]}

Budny, R. V. ^{[1
]}

Gorelenkov, N. N. ^{[1
]}

Heidbrink, W. W. ^{[3
]}

Holcomb, C. T. ^{[4
]}

Kramer, G. J. ^{[1
]}

McKee, G. R. ^{[5
]}

Makowski, M. A. ^{[4
]}

Solomon, W. M. ^{[1
]}

Shafer, M. ^{[5
]}

Strait, E. J. ^{[6
]}

Van Zeeland, M. A. ^{[6
]}

机构：

[1] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA

[2] Univ Texas Austin, Austin, TX 78712 USA

[3] Univ Calif Irvine, Irvine, CA 92697 USA

[4] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[5] Univ Wisconsin, Madison, WI 53706 USA

[6] Gen Atom Co, San Diego, CA 92186 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.101.185001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Intense axisymmetric oscillations driven by suprathermal ions injected in the direction counter to the toroidal plasma current are observed in the DIII-D tokamak. The modes appear at nearly half the ideal geodesic acoustic mode frequency, in plasmas with comparable electron and ion temperatures and elevated magnetic safety factor (q(min)>= 2). Strong bursting and frequency chirping are observed, concomitant with large (10%-15%) drops in the neutron emission. Large electron density fluctuations (n(e)/n(e)similar or equal to 1.5%) are observed with no detectable electron temperature fluctuations, confirming a dominant compressional contribution to the pressure perturbation as predicted by kinetic theory. The observed mode frequency is consistent with a recent theoretical prediction for the energetic-particle-driven geodesic acoustic mode.

引用

页数：4

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