Measurement of 3D plasma response to external magnetic perturbations in the presence of a rotating external kink

Daisuke Shiraki, Sarah M. Angelini, Patrick J. Byrne, Bryan A. Debono, Paul E. Hughes, Jeffrey P. Levesque, Michael E. Mauel, David A. Maurer, Gerald A. Navratil, Qian Peng, Nikolaus Rath, Dov J. Rhodes, Christopher C. Stoafer

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Abstract

The detailed measurements of the 3D plasma response to applied external magnetic perturbations in the presence of a rotating external kink are presented, and compared with the predictions of a single-helicity linear model of kink mode dynamics. The modular control coils of the High Beta Tokamak-Extended Pulse (HBT-EP) device are used to apply resonant m/n = 3/1 magnetic perturbations to wall-stabilized tokamak plasmas with a pre-existing rotating 3/1 kink mode. The plasma response is measured in high-resolution with the extensive magnetic diagnostic set of the HBT-EP device. The spatial structures of both the naturally rotating kink mode and the externally driven response are independently measured and observed to be identical, while the temporal dynamics are consistent with the independent evolution and superposition of the two modes. This leads to the observation of a characteristic change in 3D field dynamics as a function of the applied field amplitude. This amplitude dependence is found to be different for poloidal and radial fields. The measured 3D response is compared to and shown to be consistent with the predictions of the linear single-helicity model in the high-dissipation regime, as reported previously [M. E. Mauel, Nucl. Fusion 45, 285 (2005)].

Original languageEnglish
Article number102503
JournalPhysics of Plasmas
Volume20
Issue number10
DOIs
StatePublished - Oct 2013
Externally publishedYes

Funding

The authors gratefully acknowledge the technical support of J. Andrello and N. Rivera during the course of this work. This work was supported by U.S. Department of Energy Grant DE-FG02-86ER53222.

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