Fast ion transport in the quasi-single helical reversed-field pinch

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

doi:10.1063/1.5084059

Title: Fast ion transport in the quasi-single helical reversed-field pinch

Journal Article · 04 February 2019 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.5084059 · OSTI ID:1648958

^[1];

^[1]; Gobbin, M. ^[2];

^[3]; Boguski, J. ^[1]; Parke, E. ^[4]; Kim, J. ^[1]; Egedal, J. ^[1]

Univ. of Wisconsin, Madison, WI (United States)
Associazione Euratom-ENEA sulla Fusione, Padova (Italy). Consorzio RFX
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
TAE Technologies Inc., Foothill Ranch, CA (United States)

The reversed-field pinch (RFP) can spontaneously transition from an axisymmetric magnetic topology to a 3D-helical geometry. Investigations on fast ion transport associated with energetic particle driven Alfvén instabilities, tearing mode induced stochasticity, and neoclassical effects have been performed on the Madison Symmetric Torus. STELLGAP produced shear-Alfvén continua seeded with V3FIT 3D-equilibrium reconstructions describe the response of Alfvénic bursting activity as a direct consequence of the equilibrium change on the fast ion resonance. Furthermore, far infrared interferometry resolved electron density perturbations associated with the bursts provide a spatial measurement of the mode structure and support the reconstructions. The bursts produce no global resonant fast ion transport; however, their disappearance at a high core-resonant amplitude implies other transport mechanisms at play. Additionally, neutral particle analysis and neutron signals suggest fast ion losses at sufficient core tearing mode strength, supporting the lack of Alfvénic activity. The guiding-center code ORBIT corroborates rapid fast ion loss times in the helical state largely as a consequence of remnant tearing modes. Additionally, ORBIT simulations demonstrate little neoclassical enhancement of particle transport. While superbanana orbits may exist, the growth in the core-resonant fast ion island and the associated secondary mode overlap govern the largest transport process, leading to robust fast ion losses in the 3D-RFP.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

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

Grant/Contract Number:: AC05-00OR22725; FC02-05ER54814

OSTI ID:: 1648958

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 2 Vol. 26; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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A measure of fast ion beta at marginal stability in the reversed field pinch Capecchi, W.; Anderson, J. K.; Bonofiglo, P. J. Nuclear Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1741-4326/ab2473	journal	June 2019
Shear Alfvén wave continuum spectrum with bifurcated helical core equilibria Rakha, Allah; Lauber, Ph.; Mantsinen, M. J. Nuclear Fusion, Vol. 59, Issue 10 https://doi.org/10.1088/1741-4326/ab3a60	journal	September 2019
Fast Ion Transport in the Three-Dimensional Reversed-Field Pinch Bonofiglo, P. J.; Anderson, J. K.; Boguski, J. Physical Review Letters, Vol. 123, Issue 5 https://doi.org/10.1103/physrevlett.123.055001	journal	July 2019

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