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Mechanism for collective energy transfer from neutral beam-injected ions to fusion-born alpha particles on cyclotron timescales in a plasma
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Dendy, R. O., Chapman-Oplopoiou, B., Reman, B. C. G. and Cook, J. W. S. (2023) Mechanism for collective energy transfer from neutral beam-injected ions to fusion-born alpha particles on cyclotron timescales in a plasma. Physical Review Letters, 130 (10). 105102. doi:10.1103/PhysRevLett.130.105102 ISSN 0031-9007.
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WRAP-Mechanism-for-collective-energy-transfer-from-neutral-beam-injected-ions-to-fusion-born-alpha-particles-on-cyclotron-timescales-in-a-plasma-Dendy-2023.pdf - Published Version - Requires a PDF viewer. Download (3891Kb) | Preview |
Official URL: http://dx.doi.org/10.1103/PhysRevLett.130.105102
Abstract
Helium ash alpha particles at ∼100 keV in magnetically confined fusion plasmas may have the same Larmor radius, as well as cyclotron frequency, as the energetic beam-injected deuterons that heat the plasma. While the velocity-space distribution of the helium ash is monotonically decreasing, that of the energetic deuterons is a delta function in the edge plasma. Here we identify, by means of first principles particle-in-cell computations, a new physical process by which Larmor radius matching enables collective gyroresonant energy transfer between these two colocated minority energetic ion populations, embedded in majority thermal plasma. This newly identified nonlinear phenomenon rests on similar underlying physics to widely observed ion cyclotron emission from suprathermal minority ion populations.
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): | Plasma confinement, Plasma (Ionized gases), Nuclear fusion, Electromagnetic waves | |||||||||
Journal or Publication Title: | Physical Review Letters | |||||||||
Publisher: | American Physical Society | |||||||||
ISSN: | 0031-9007 | |||||||||
Official Date: | 10 March 2023 | |||||||||
Dates: |
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Volume: | 130 | |||||||||
Number: | 10 | |||||||||
Number of Pages: | 7 | |||||||||
Article Number: | 105102 | |||||||||
DOI: | 10.1103/PhysRevLett.130.105102 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||
Date of first compliant deposit: | 20 March 2023 | |||||||||
Date of first compliant Open Access: | 21 March 2023 | |||||||||
RIOXX Funder/Project Grant: |
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