Spatially resolved measurements of two-dimensional turbulent structures in DIII-D plasmas

被引：6
|
作者：
Zemedkun, S. E. [1 ]
Che, S. [2 ]
Chen, Y. [1 ]
Domier, C. W. [2 ]
Luhmann, N. C., Jr. [2 ]
Munsat, T. [1 ]
Parker, S. E. [1 ]
Tobias, B. [3 ]
Wan, W. [1 ]
Yu, L. [2 ]
机构：
[1] Univ Colorado, Ctr Integrated Plasma Studies, Boulder, CO 80309 USA
[2] Univ Calif Davis, Davis, CA 95616 USA
[3] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA
来源：
PHYSICS OF PLASMAS | 2015年 / 22卷 / 12期
关键词：
ELECTRON-TEMPERATURE FLUCTUATIONS; CYCLOTRON EMISSION; GYROKINETIC SIMULATION; MODE TURBULENCE; DENSITY PEAKING; TRANSPORT; MICROTURBULENCE; COLLISIONALITY; DEPENDENCE; PROFILES;
D O I：
10.1063/1.4938032
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：
Two-dimensional observations of spatially coherent electron temperature fluctuations at drift-wave scales (k similar to 1 cm(-1)) have been made using the electron cyclotron emission imaging diagnostic on the DIII-D tokamak. These measurements enable the extraction of spectral properties, including poloidal dispersion relations. Temperature fluctuation levels are found to be (T) over tilde (e)= < T-e > = 1: 2%, and the phase velocity of the fluctuations is found to be constant across frequencies, consistent with modes having real frequencies low compared to the rotation-induced Doppler shifts. Comparisons with radially global linear gyrokinetic simulations suggest that the observed modes may be trapped electron modes. (C) 2015 AIP Publishing LLC.
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页数：8
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