Visualization of Fast Ion Phase-Space Flow Driven by Alfvén Instabilities

Du, X. D.; Van Zeeland, M. A.; Heidbrink, W. W.; Gonzalez-Martin, J.; Särkimäki, K.; Snicker, A.; Lin, D.; Collins, C. S.; Austin, M. E.; McKee, G. R.; Yan, Z.; Todo, Y.; Wu, W.

doi:10.1103/physrevlett.127.235002

Visualization of Fast Ion Phase-Space Flow Driven by Alfvén Instabilities

Journal Article · Wed Dec 01 00:00:00 UTC 2021 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.127.235002· OSTI ID:1962874

^[1]; Van Zeeland, M. A. ^[2]; Heidbrink, W. W. ^[3]; Gonzalez-Martin, J. ^[3]; ^[4]; ^[5]; Lin, D. ^[3]; Collins, C. S. ^[2]; ^[6]; McKee, G. R. ^[7]; Yan, Z. ^[7]; Todo, Y. ^[8]; ^[2]

General Atomics, San Diego, CA (United States); General Atomics
General Atomics, San Diego, CA (United States)
Univ. of California, Irvine, CA (United States)
Chalmers Univ. of Technology, Gothenburg (Sweden)
Aalto Univ., Otaniemi (Finland)
Univ. of Texas, Austin, TX (United States)
Univ. of Wisconsin, Madison, WI (United States)
National Institute for Fusion Science, Toki (Japan)

Fast ion phase-space flow, driven by Alfven eigenmodes (AEs), is measured by an imaging neutral particle analyzer in the DIII-D tokamak. The flow firstly appears near the minimum safety factor at the injection energy of neutral beams, and then moves radially inward and outward by gaining and losing energy, respectively. The flow trajectories in phase space align well with the intersection lines of the constant magnetic moment surfaces and constant E – (ω/n)P_ζ surfaces, where E, P_ζ are energy and toroidal canonical momentum of ions; ω and n are angular frequencies and toroidal mode numbers of AEs. It is found that the flow is so destructive that the thermalization of fast ions is no longer observed in regions of strong interaction. Here, the measured phase-space flow is consistent with nonlinear hybrid kinetic-magnetohydrodynamics simulation. Calculations of the relatively narrow phase-space islands reveal that fast ions must transition between different flow trajectories to experience large-scale phase-space transport.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC05-00OR22725; FC02-04ER54698; SC0015878

OSTI ID:: 1962874

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 23 Vol. 127; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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