Low-frequency shear Alfvén waves at DIII-D: Theoretical interpretation of experimental observations

Ma, Ruirui; Heidbrink, W. W.; Chen, Liu; Zonca, Fulvio; Qiu, Zhiyong

doi:10.1063/5.0141186

Title: Low-frequency shear Alfvén waves at DIII-D: Theoretical interpretation of experimental observations

Journal Article · Wed Apr 05 00:00:00 EDT 2023 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0141186· OSTI ID:1983936

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Southwestern Institute of Physics, Chengdu (China); Center for Nonlinear Plasma Science and C.R. ENEA Frascati (Italy)
University of California, Irvine, CA (United States)
Center for Nonlinear Plasma Science and C.R. ENEA Frascati (Italy); University of California, Irvine, CA (United States); Zhejiang University, Hangzhou (China, People's Republic of)
Center for Nonlinear Plasma Science and C.R. ENEA Frascati (Italy); Zhejiang University, Hangzhou (China, People's Republic of)

The linear properties of the low-frequency shear Alfvén waves such as those associated with the beta-induced Alfvén eigenmodes (BAEs) and the low-frequency modes observed in reversed-magnetic-shear DIII-D discharges [W. Heidbrink et al., Nucl. Fusion 61, 066031 (2021)] are theoretically investigated and delineated based on the theoretical framework of the general fishbone-like dispersion relation (GFLDR). By adopting representative experimental equilibrium profiles, it is found that, even though both modes are predominantly of Alfvénic polarization, the low-frequency mode is a reactive unstable mode with weak coupling to the energetic particles, while the BAE involves a dissipative instability due to resonant excitation by the energetic ions. Thus, the low-frequency mode is more appropriately called a low-frequency Alfvén mode (LFAM). Moreover, the ascending frequency spectrum patterns of the experimentally observed BAEs and LFAMs can be theoretically reproduced by varying q _min and also be well interpreted based on the GFLDR. The present analysis illustrates the solid predictive capability of the GFLDR and its practical usefulness in enhancing the interpretative capability of both experimental and numerical simulation results.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC) Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Key Research and Development Program of China; National Science Foundation of China; Italian Ministry of Foreign Affairs; Natural Science Foundation of Sichuan; Sichuan Science and Technology Program; Euratom Research and Training Programme; USDOE

Grant/Contract Number:: FC02-04ER54698; SC0020337; 2022YFE03040002; 2018YFE0304103; 12261131622; 12175053; CN23GR02; 2022NSFSC1814; 2022ZYD0019; 101052200

OSTI ID:: 1983936

Alternate ID(s):: OSTI ID: 1968538

Journal Information:: Physics of Plasmas, Vol. 30, Issue 4; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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