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

Nuclear Fushion

article

N.A. Crocker¹  S.X. Tang¹  K.E. Thome²  J.B. Lestz³  E.V. Belova⁴  A. Zalzali⁵  R.O. Dendy⁵  W.A. Peebles¹  K.K. Barada¹  R. Hong¹  T.L. Rhodes¹  G. Wang¹  L. Zeng¹  T.A. Carter¹  G.H. DeGrandchamp³  W.W. Heidbrink³  R.I. Pinsker² 

[1] University of California-Los Angeles;General Atomics;University of California-Irvine;Princeton Plasma Physics Laboratory, Princeton;University of Warwick;UK Atomic Energy Authority, Culham Centre for Fusion Energy

关键词: ion cyclotron emission;    Doppler backscattering;    energetic particles;   

DOI  :  10.1088/1741-4326/ac3d6a

来源: Institute of Physics Publishing Ltd.

【 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 (ilde{n} ) 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 _⊥ ρ _fast ≳ 1, consistent with the cyclotron harmonic wave branch of the magnetoacoustic cyclotron instability, or electrostatic instability mechanisms. Measurements show extended spatial structure (at least ∼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.

【 授权许可】

Unknown