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Title: 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:
 [1];  [2];  [1];  [1]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. 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) (SC-24); 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. doi: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. doi: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 = {2016},
month = {5}
}

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