Identification of multi-modal plasma responses to applied magnetic perturbations using the plasma reluctance
Abstract
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.
- Authors:
-
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- General Atomics, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Nuclear Energy (NE)
- Contributing Org.:
- General Atomics, San Diego, CA (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- OSTI Identifier:
- 1254855
- Alternate Identifier(s):
- OSTI ID: 1250583; OSTI ID: 1371572; OSTI ID: 1399701
- Report Number(s):
- PPPL-5249
Journal ID: ISSN 1070-664X; TRN: US1601727
- Grant/Contract Number:
- AC02-09CH11466; FC02-04ER54698
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 23; Journal Issue: 5; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Magnetics; Magnetohydrodynamics (MHD); MHD Instability; eigenvalues; external field; normal modes; plasma diagnostics
Citation Formats
Logan, Nikolas C., Paz-Soldan, Carlos, Park, Jong-Kyu, and Nazikian, Raffi. Identification of multi-modal plasma responses to applied magnetic perturbations using the plasma reluctance. United States: N. p., 2016.
Web. doi:10.1063/1.4948281.
Logan, Nikolas C., Paz-Soldan, Carlos, Park, Jong-Kyu, & Nazikian, Raffi. Identification of multi-modal plasma responses to applied magnetic perturbations using the plasma reluctance. United States. https://doi.org/10.1063/1.4948281
Logan, Nikolas C., Paz-Soldan, Carlos, Park, Jong-Kyu, and Nazikian, Raffi. Tue .
"Identification of multi-modal plasma responses to applied magnetic perturbations using the plasma reluctance". United States. https://doi.org/10.1063/1.4948281. https://www.osti.gov/servlets/purl/1254855.
@article{osti_1254855,
title = {Identification of multi-modal plasma responses to applied magnetic perturbations using the plasma reluctance},
author = {Logan, Nikolas C. and Paz-Soldan, Carlos and Park, Jong-Kyu and Nazikian, Raffi},
abstractNote = {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.},
doi = {10.1063/1.4948281},
journal = {Physics of Plasmas},
number = 5,
volume = 23,
place = {United States},
year = {Tue May 03 00:00:00 EDT 2016},
month = {Tue May 03 00:00:00 EDT 2016}
}
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Works referencing / citing this record:
Modal analysis of the full poloidal structure of the plasma response to n = 2 magnetic perturbations
journal, July 2018
- Munaretto, S.; Strait, E. J.; Haskey, S. R.
- Physics of Plasmas, Vol. 25, Issue 7
Magnetic polarization measurements of the multi-modal plasma response to 3D fields in the EAST tokamak
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Grassy-ELM regime with edge resonant magnetic perturbations in fully noninductive plasmas in the DIII-D tokamak
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Identification of multiple eigenmode growth rates in DIII-D and EAST tokamak plasmas
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A new criterion for controlling edge localized modes based on a multi-mode plasma response
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