Novel internal measurements of ion cyclotron frequency range fast-ion driven modes

被引：16
|
作者：
Crocker, N. A. [1 ]
Tang, S. X. [1 ]
Thome, K. E. [2 ]
Lestz, J. B. [3 ]
Belova, E., V [4 ]
Zalzali, A. [5 ]
Dendy, R. O. [5 ,6 ]
Peebles, W. A. [1 ]
Barada, K. K. [1 ]
Hong, R. [1 ]
Rhodes, T. L. [1 ]
Wang, G. [1 ]
Zeng, L. [1 ]
Carter, T. A. [1 ]
DeGrandchamp, G. H. [3 ]
Heidbrink, W. W. [3 ]
Pinsker, R., I [2 ]
机构：
[1] Univ Calif Los Angeles, Los Angeles, CA 90095 USA
[2] Gen Atom, San Diego, CA 92121 USA
[3] Univ Calif Irvine, Irvine, CA 92697 USA
[4] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA
[5] Univ Warwick, Coventry CV4 7AL, W Midlands, England
[6] Culham Ctr Fus Energy, UK Atom Energy Author, Abingdon OX14 3DB, Oxon, England
来源：
NUCLEAR FUSION | 2022年 / 62卷 / 02期
基金：
英国工程与自然科学研究理事会;
关键词：
ion cyclotron emission; Doppler backscattering; energetic particles; INSTABILITY; EXCITATION; WAVES;
D O I：
10.1088/1741-4326/ac3d6a
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：
Novel internal measurements and analysis of ion cyclotron frequency range fast-ion driven modes in DIII-D are presented. Observations, including internal density fluctuation ((n) over tilde) measurements obtained via Doppler backscattering, are presented for modes at low harmonics of the ion cyclotron frequency localized in the edge. The measurements indicate that these waves, identified as coherent ion cyclotron emission (ICE), have high wave number, k(perpendicular to rho fast)greater than or similar to 1, consistent with the cyclotron harmonic wave branch of the magnctoacoustic cyclotron instability, or electrostatic instability mechanisms. Measurements show extended spatial structure (at least similar to 1/6 the minor radius). These edge ICE modes undergo amplitude modulation correlated with edge localized modes (ELM) that is qualitatively consistent with expectations for ELM-induced fast-ion transport.
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页数：8
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