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Interpretation of ion cyclotron emission from sub-Alfvénic beam-injected ions heated plasmas soon after L-H mode transition in EAST
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Liu, Lunan, Zhang, Xinjun, Ochoukov, R., Zhang, Wei, McClements, K. G., Dendy, R. O., Salewski, M., Zhu, Yubao, Qin, Chengming, Moseev, D., Bobkov, V., Chapman-Oplopoiou, B. and Zalzali, A. (2024) Interpretation of ion cyclotron emission from sub-Alfvénic beam-injected ions heated plasmas soon after L-H mode transition in EAST. Plasma Physics and Controlled Fusion, 66 (1). 015007. doi:10.1088/1361-6587/ad0fa6 ISSN 0741-3335.
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Official URL: http://doi.org/10.1088/1361-6587/ad0fa6
Abstract
Ion cyclotron emission (ICE) at deuterium ion cyclotron harmonics, driven by sub-Alfvénic beam-injected deuterium ions, has been observed by the high-frequency B-dot probe in the EAST tokamak. The origin of ICE shifts from the plasma core to the plasma edge soon after an L-H mode transition, where the beam-injected deuterium ions have a relatively peak bump-on tail structure in the energy direction and a very intense pitch angle anisotropy. Based on the fast ion distribution function obtained from the TRANSP/NUBEAM code, together with a linear analysis theory of magnetoacoustic cyclotron instability (MCI), the growth rates of MCI could be calculated. It is shown that MCI, resulting in the generation of obliquely propagating fast Alfvén waves at deuterium ion cyclotron harmonics, can occur under such conditions. And the temporal evolution of the MCI growth rate closely follows that of the observed ICE amplitude in the EAST.
Item Type: | Journal Article | ||||||||||||||||||||||||
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Subjects: | Q Science > QC Physics | ||||||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Ions, Tokamaks -- Magnetic properties, Tomography, Emission, Magnetohydrodynamic waves, Cyclotron resonance, Plasma instabilities, Plasma (Ionized gases) | ||||||||||||||||||||||||
Journal or Publication Title: | Plasma Physics and Controlled Fusion | ||||||||||||||||||||||||
Publisher: | Institute of Physics Publishing Ltd. | ||||||||||||||||||||||||
ISSN: | 0741-3335 | ||||||||||||||||||||||||
Official Date: | 1 December 2024 | ||||||||||||||||||||||||
Dates: |
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Volume: | 66 | ||||||||||||||||||||||||
Number: | 1 | ||||||||||||||||||||||||
Article Number: | 015007 | ||||||||||||||||||||||||
DOI: | 10.1088/1361-6587/ad0fa6 | ||||||||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||||||||
Copyright Holders: | © 2023 IOP Publishing Ltd | ||||||||||||||||||||||||
Date of first compliant deposit: | 13 December 2023 | ||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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