Disruption avoidance via radio frequency current condensation in magnetic islands produced by off-normal events

Reiman, A. H.; Bertelli, N.; Fisch, N. J.; Frank, S. J.; Jin, S.; Nies, R.; Rodriguez, E.

doi:10.1063/5.0042479

Title: Disruption avoidance via radio frequency current condensation in magnetic islands produced by off-normal events

Journal Article · Wed Apr 21 00:00:00 EDT 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0042479· OSTI ID:1810620

^[1];

^[1]; Frank, S. J. ^[2];

^[1];

^[1]; Rodriguez, E. ^[1]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

This paper discusses the use of radio frequency (RF) current drive to stabilize large islands, focusing on nonlinear effects that appear when relatively high powers are used to stabilize large islands. We are interested in developing a capability to stabilize large islands via RF driven currents to avoid the need for mitigation to the extent possible. As tokamaks are designed and built with increasing levels of stored energy in the plasma, disruptions become increasingly dangerous. It has been reported that 95% of the disruptions in the Joint European Torus tokamak with the ITER-like wall are preceded by the growth of large locked islands. These large islands are mostly produced by off-normal events other than neoclassical tearing modes. This paper presents theory and modeling for a nonlinear “RF current condensation” effect that can concentrate the RF driven current near the center of a large island, thereby increasing the efficiency of the stabilization. A nonlinear shadowing effect can hinder the stabilization of islands if the aiming of the ray trajectories does not properly consider the nonlinear effects.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-91ER54109; SC0018090; AC02-09CH11466; SC0016072

OSTI ID:: 1810620

Alternate ID(s):: OSTI ID: 1970654

Journal Information:: Physics of Plasmas, Vol. 28, Issue 4; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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