Suppression of MHD modes with active phase-control of probe-injected currents

Brooks, John W.; Bialek, James; Hansen, Chris J.; Levesque, Jeffrey P.; Mauel, Michael E.; Navratil, Gerald A.; Saperstein, Alex; Stewart, Ian G.

doi:10.1088/1741-4326/ac1544

Suppression of MHD modes with active phase-control of probe-injected currents

Journal Article · Thu Aug 05 00:00:00 EDT 2021 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac1544· OSTI ID:1832523

; Bialek, James; ; ; ; ; ;

Abstract

Active phase-control of probe-injected current is shown to both suppress and amplify long-wavelength rotating magnetohydrodynamic instabilities in the HBT-EP tokamak. Four probes are connected in quadrature and energized to drive non-axisymmetric currents through the edge of the tokamak, creating magnetic perturbations comparable to previously-studied saturated kink modes or resonant magnetic perturbations that are generated by an external control coil array. Measurements of the magnetic perturbations from the probe-injected currents determine a set of current-carrying helical filaments used to model active feedback control of resistive wall modes. These experiments suggest current-injection feedback may be an effective alternative to external control coils for control of RWMs and other long-wavelength kink-like modes at the edge of tokamaks.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-86ER53222

OSTI ID:: 1832523

Alternate ID(s):: OSTI ID: 1849935
OSTI ID: 23131911

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 9 Vol. 61; ISSN 0029-5515

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: IAEA

Language:: English

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