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Title: Linear ideal MHD predictions for n = 2 non-axisymmetric magnetic perturbations on DIII-D

Here, an extensive examination of the plasma response to dominantly n = 2 non-axisymmetric magnetic perturbations (MPs) on the DIII-D tokamak shows the potential to control 3D field interactions by varying the poloidal spectrum of the radial magnetic field. The plasma response is calculated as a function of the applied magnetic field structure and plasma parameters, using the linear magnetohydrodynamic code MARS-F. The ideal, single fluid plasma response is decomposed into two main components: a local pitch-resonant response occurring at rational magnetic flux surfaces, and a global kink response. The efficiency with which the field couples to the total plasma response is determined by the safety factor and the structure of the applied field. In many cases, control of the applied field has a more significant effect than control of plasma parameters, which is of particular interest since it can be modified at will throughout a shot to achieve a desired effect. The presence of toroidal harmonics, other than the dominant n = 2 component, is examined revealing a significant n = 4 component in the perturbations applied by the DIII-D MP coils; however, modeling shows the plasma responses to n = 4 perturbations are substantially smaller than the dominantmore » n = 2 responses in most situations.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [5]
  1. The Australian National Univ., Canberra, ACT (Australia)
  2. General Atomics, San Diego, CA (United States)
  3. Euratom/CCFE Fusion Assoc., Abingdon (United Kingdom)
  4. Columbia Univ., New York, NY (United States)
  5. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Grant/Contract Number:
FC02-04ER54698
Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 56; Journal Issue: 3; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Research Org:
General Atomics, San Diego, CA (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; edge localized modes; resonant magnetic perturbations; magnetohydrodynamics; tokamaks; toroidal plasma confinement
OSTI Identifier:
1356330

Haskey, Shaun R., Lanctot, Matthew J., Liu, Y. Q., Hanson, Jeremy M., Blackwell, B. D., and Nazikian, Raffi. Linear ideal MHD predictions for n = 2 non-axisymmetric magnetic perturbations on DIII-D. United States: N. p., Web. doi:10.1088/0741-3335/56/3/035005.
Haskey, Shaun R., Lanctot, Matthew J., Liu, Y. Q., Hanson, Jeremy M., Blackwell, B. D., & Nazikian, Raffi. Linear ideal MHD predictions for n = 2 non-axisymmetric magnetic perturbations on DIII-D. United States. doi:10.1088/0741-3335/56/3/035005.
Haskey, Shaun R., Lanctot, Matthew J., Liu, Y. Q., Hanson, Jeremy M., Blackwell, B. D., and Nazikian, Raffi. 2014. "Linear ideal MHD predictions for n = 2 non-axisymmetric magnetic perturbations on DIII-D". United States. doi:10.1088/0741-3335/56/3/035005. https://www.osti.gov/servlets/purl/1356330.
@article{osti_1356330,
title = {Linear ideal MHD predictions for n = 2 non-axisymmetric magnetic perturbations on DIII-D},
author = {Haskey, Shaun R. and Lanctot, Matthew J. and Liu, Y. Q. and Hanson, Jeremy M. and Blackwell, B. D. and Nazikian, Raffi},
abstractNote = {Here, an extensive examination of the plasma response to dominantly n = 2 non-axisymmetric magnetic perturbations (MPs) on the DIII-D tokamak shows the potential to control 3D field interactions by varying the poloidal spectrum of the radial magnetic field. The plasma response is calculated as a function of the applied magnetic field structure and plasma parameters, using the linear magnetohydrodynamic code MARS-F. The ideal, single fluid plasma response is decomposed into two main components: a local pitch-resonant response occurring at rational magnetic flux surfaces, and a global kink response. The efficiency with which the field couples to the total plasma response is determined by the safety factor and the structure of the applied field. In many cases, control of the applied field has a more significant effect than control of plasma parameters, which is of particular interest since it can be modified at will throughout a shot to achieve a desired effect. The presence of toroidal harmonics, other than the dominant n = 2 component, is examined revealing a significant n = 4 component in the perturbations applied by the DIII-D MP coils; however, modeling shows the plasma responses to n = 4 perturbations are substantially smaller than the dominant n = 2 responses in most situations.},
doi = {10.1088/0741-3335/56/3/035005},
journal = {Plasma Physics and Controlled Fusion},
number = 3,
volume = 56,
place = {United States},
year = {2014},
month = {2}
}