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Explanation of core ion cyclotron emission from beam-ion heated plasmas in ASDEX Upgrade by the magnetoacoustic cyclotron instability
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Liu, Lunan, Ochoukov, Roman, McClements, K. G., Dendy, R. O., Bobkov, Volodymyr V, Weiland, Markus, Bilato, Roberto, Faugel, Helmut, Moseev, Dmitry, Salewski, Mirko, Zhang, Wei, Zhang, Xinjun, Zhu, Yubao, Chapman, Benjamin and Zalzali, Amani (2020) Explanation of core ion cyclotron emission from beam-ion heated plasmas in ASDEX Upgrade by the magnetoacoustic cyclotron instability. Nuclear Fusion, 61 (2). 026004. doi:10.1088/1741-4326/abc7ec ISSN 0029-5515.
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Official URL: http://dx.doi.org/10.1088/1741-4326/abc7ec
Abstract
Bursts of ion cyclotron emission (ICE), with spectral peaks corresponding to the hydrogen cyclotron harmonic frequencies in the plasma core are detected from helium plasmas heated by sub-Alfvénic beam-injected hydrogen ions in the ASDEX Upgrade tokamak. Based on the fast ion distribution function obtained from TRANSP/NUBEAM code, together with a linear analytical theory of the magnetoacoustic cyclotron instability (MCI), the growth rates of MCI could be calculated. In our theoretical and experimental studies, we found that the excitation mechanism of core ICE driven by sub-Alfvénic beam ions in ASDEX Upgrade is MCI as the time evolution of MCI growth rates is broadly consistent with measured ICE amplitudes. The MCI growth rate is very sensitive to the energy and velocity distribution of beam-injected ions and is suppressed by the slowing down of the dominant beam-injected ion velocity and the spreading of the fast ion distribution profile. This may help to account for the experimental observation that ICE signals disappear within ~3 ms after the NBI turn-off time, much faster than the slowing down times of the beam ions.
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): | Nuclear fusion, Plasma (Ionized gases), Tokamaks -- Magnetic properties, Cyclotron resonance -- Research, Plasma instabilities -- Research | ||||||||||||||||||
Journal or Publication Title: | Nuclear Fusion | ||||||||||||||||||
Publisher: | Institute of Physics Publishing Ltd. | ||||||||||||||||||
ISSN: | 0029-5515 | ||||||||||||||||||
Official Date: | 21 December 2020 | ||||||||||||||||||
Dates: |
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Volume: | 61 | ||||||||||||||||||
Number: | 2 | ||||||||||||||||||
Article Number: | 026004 | ||||||||||||||||||
DOI: | 10.1088/1741-4326/abc7ec | ||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||
Date of first compliant deposit: | 1 June 2021 | ||||||||||||||||||
Date of first compliant Open Access: | 21 December 2021 | ||||||||||||||||||
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