Fast Ion Transport in the Three-Dimensional Reversed-Field Pinch

P. J. Bonofiglo; J. K. Anderson; J. Boguski; J. Kim; J. Egedal; M. Gobbin; D. A. Spong; E. Parke

doi:10.1103/PhysRevLett.123.055001

Fast Ion Transport in the Three-Dimensional Reversed-Field Pinch

P. J. Bonofiglo, J. K. Anderson, J. Boguski, J. Kim, J. Egedal, M. Gobbin, D. A. Spong, E. Parke

Plasma Theory and Modeling

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2 Scopus citations

Abstract

We report on the first comprehensive experimental and numerical study of fast ion transport in the helical reversed-field pinch (RFP). Classical orbit effects dominate the macroscopic confinement properties. The strongest effect arises from growth in the dominant fast ion guiding-center island, but substantial influence from remnant subdominant tearing modes also plays a critical role. At the formation of the helical RFP, neutron flux measurements indicate a drastic loss of fast ions at sufficient subdominant mode amplitudes. Simulations corroborate these measurements and suggest that subdominant tearing modes strongly limit fast ion behavior. Previous work details a sharp thermal transport barrier and suggests the helical RFP as an Ohmically heated fusion reactor candidate; the enhanced transport of fast ions reported here identifies a key challenge for this scheme, but a workable scenario is conceivable with low subdominant tearing mode amplitudes.

Original language	English
Article number	055001
Journal	Physical Review Letters
Volume	123
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.123.055001
State	Published - Jul 29 2019

Funding

This work is supported by the U.S. DOE Office of Science, Office of Fusion Energy Sciences program under Award No. DE-FC02-05ER54814 and accomplished with the use of the infrastructure of Complex DOL (Budker Institute of Nuclear Physics, Russia).

Funders	Funder number
DOE Office of Science
Fusion Energy Sciences
Horizon 2020 Framework Programme	633053

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10.1103/PhysRevLett.123.055001

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abstract = "We report on the first comprehensive experimental and numerical study of fast ion transport in the helical reversed-field pinch (RFP). Classical orbit effects dominate the macroscopic confinement properties. The strongest effect arises from growth in the dominant fast ion guiding-center island, but substantial influence from remnant subdominant tearing modes also plays a critical role. At the formation of the helical RFP, neutron flux measurements indicate a drastic loss of fast ions at sufficient subdominant mode amplitudes. Simulations corroborate these measurements and suggest that subdominant tearing modes strongly limit fast ion behavior. Previous work details a sharp thermal transport barrier and suggests the helical RFP as an Ohmically heated fusion reactor candidate; the enhanced transport of fast ions reported here identifies a key challenge for this scheme, but a workable scenario is conceivable with low subdominant tearing mode amplitudes.",

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AU - Spong, D. A.

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Fast Ion Transport in the Three-Dimensional Reversed-Field Pinch

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