Divertor detachment in the pre-fusion power operation phase in ITER during application of resonant magnetic perturbations

Frerichs, H.; Bonnin, X.; Feng, Y.; Li, L.; Liu, Y. Q.; Loarte, A.; Pitts, R. A.; Reiter, D.; Schmitz, O.

doi:10.1088/1741-4326/ac2ff5

Divertor detachment in the pre-fusion power operation phase in ITER during application of resonant magnetic perturbations

Journal Article · Mon Nov 01 00:00:00 EDT 2021 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac2ff5· OSTI ID:1979397

^[1]; ^[2]; ^[3]; Li, L. ^[4]; ^[5]; ^[2]; ^[2]; ^[6]; ^[7]

University of Wisconsin, Madison, WI (United States); OSTI
ITER Organization (France)
Max-Planck-Institut für Plasmaphysik, Greifswald (Germany)
Donghua University, Shanghai (China)
General Atomics, San Diego, CA (United States)
Heinrich-Heine-University, Düsseldorf (Germany)
University of Wisconsin, Madison, WI (United States)

Detachment of the divertor plasma during application of resonant magnetic perturbation (RMP) fields is evaluated for hydrogen H-mode plasma during the first pre-fusion power operation (PFPO-1) phase in ITER by 3D plasma boundary modelling with EMC3–EIRENE. Plasma response effects from a linearized, resistive, single fluid MHD model are discussed, which includes partial screening of the externally applied field—but also field amplification near the separatrix. Furthermore, this field amplification is found to play a pivotal role for the magnetic footprint on the divertor targets, but is sensitive to model parameters. Extensions of the footprint beyond the straight portions of the ITER vertical divertor targets, optimized for high stationary heat flux handling, may be possible depending on the level of toroidal rotation in the plasma. Exhaust from the bulk plasma is guided by the helical corrugations (lobes) of the perturbed separatrix, and this results in an upstream heat flux that is distributed over these lobes with lower peak values than in the typical radial heat flux profiles seen in the absence of magnetic perturbations. As a consequence, an earlier onset (with respect to the upstream density) of detachment is found in the traditional strike zone when RMPs are applied, but secondary, non-axisymmetric strike locations appear—and those remain attached at temperatures above 10 eV. Neon seeding can mitigate these non-axisymmetric heat loads, but this becomes less efficient for large magnetic footprints.

View Accepted Manuscript (DOE)

Research Organization:: University of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0020284; SC0020357

OSTI ID:: 1979397

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 12 Vol. 61; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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