Identification of multi-modal plasma responses to applied magnetic perturbations using the plasma reluctance

Logan, Nikolas C.; Paz-Soldan, Carlos; Park, Jong-Kyu; Nazikian, Raffi

doi:10.1063/1.4948281

Title: Identification of multi-modal plasma responses to applied magnetic perturbations using the plasma reluctance

Journal Article · Tue May 03 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4948281· OSTI ID:1254855

Logan, Nikolas C. ^[1]; Paz-Soldan, Carlos ^[2]; Park, Jong-Kyu ^[1]; Nazikian, Raffi ^[1]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
General Atomics, San Diego, CA (United States)

Using the plasma reluctance, the Ideal Perturbed Equilibrium Code is able to efficiently identify the structure of multi-modal magnetic plasma response measurements and the corresponding impact on plasma performance in the DIII-D tokamak. Recent experiments demonstrated that multiple kink modes of comparable amplitudes can be driven by applied nonaxisymmetric fields with toroidal mode number n = 2. This multi-modal response is in good agreement with ideal magnetohydrodynamic models, but detailed decompositions presented here show that the mode structures are not fully described by either the least stable modes or the resonant plasma response. This paper identifies the measured response fields as the first eigenmodes of the plasma reluctance, enabling clear diagnosis of the plasma modes and their impact on performance from external sensors. The reluctance shows, for example, how very stable modes compose a significant portion of the multi-modal plasma response field and that these stable modes drive significant resonant current. Finally, this work is an overview of the first experimental applications using the reluctance to interpret the measured response and relate it to multifaceted physics, aimed towards providing the foundation of understanding needed to optimize nonaxisymmetric fields for independent control of stability and transport.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States)

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

Contributing Organization:: General Atomics, San Diego, CA (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Grant/Contract Number:: AC02-09CH11466; FC02-04ER54698

OSTI ID:: 1254855

Alternate ID(s):: OSTI ID: 1250583; OSTI ID: 1371572; OSTI ID: 1399701

Report Number(s):: PPPL-5249; TRN: US1601727

Journal Information:: Physics of Plasmas, Vol. 23, Issue 5; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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Cited By (5)

Modal analysis of the full poloidal structure of the plasma response to n = 2 magnetic perturbations Munaretto, S.; Strait, E. J.; Haskey, S. R. Physics of Plasmas, Vol. 25, Issue 7 https://doi.org/10.1063/1.5029381	journal	July 2018
Magnetic polarization measurements of the multi-modal plasma response to 3D fields in the EAST tokamak Logan, N. C.; Cui, L.; Wang, H. Nuclear Fusion, Vol. 58, Issue 7 https://doi.org/10.1088/1741-4326/aac129	journal	May 2018
Grassy-ELM regime with edge resonant magnetic perturbations in fully noninductive plasmas in the DIII-D tokamak Nazikian, R.; Petty, C. C.; Bortolon, A. Nuclear Fusion, Vol. 58, Issue 10 https://doi.org/10.1088/1741-4326/aad20d	journal	July 2018
Identification of multiple eigenmode growth rates in DIII-D and EAST tokamak plasmas Wang, Z. R.; Logan, N. C.; Munaretto, S. Nuclear Fusion, Vol. 59, Issue 2 https://doi.org/10.1088/1741-4326/aaf671	journal	January 2019
A new criterion for controlling edge localized modes based on a multi-mode plasma response Gu, S.; Wan, B.; Sun, Y. Nuclear Fusion, Vol. 59, Issue 12 https://doi.org/10.1088/1741-4326/ab4566	journal	October 2019

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