Related Experiment Video
Updated: Jan 20, 2026
Pore Transport and Ion-Pair Transport
Fast Ion Transport in the Three-Dimensional Reversed-Field Pinch
P J Bonofiglo1, J K Anderson1, J Boguski1
1University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
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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