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Title: Effects of resistivity and rotation on the linear plasma response to non-axisymmetric magnetic perturbations on DIII-D

Abstract

Parameter scans show the strong dependence of the plasma response on the poloidal structure of the applied field highlighting the importance of being able to control this parameter using non-axisymmetric coil sets. An extensive examination of the linear single fluid plasma response to n = 3 magnetic perturbations in L-mode DIII-D lower single null plasmas is presented. The effects of plasma resistivity, toroidal rotation and applied field structure are calculated using the linear single fluid MHD code, MARS-F. Measures which separate the response into a pitch-resonant and resonant field amplification (RFA) component are used to demonstrate the extent to which resonant screening and RFA occurs. The ability to control the ratio of pitch-resonant fields to RFA by varying the phasing between upper and lower resonant magnetic perturbations coils sets is shown. The predicted magnetic probe outputs and displacement at the x-point are also calculated for comparison with experiments. Additionally, modelling of the linear plasma response using experimental toroidal rotation profiles and Spitzer like resistivity profiles are compared with results which provide experimental evidence of a direct link between the decay of the resonant screening response and the formation of a 3D boundary. As a result, good agreement is found duringmore » the initial application of the MP, however, later in the shot a sudden drop in the poloidal magnetic probe output occurs which is not captured in the linear single fluid modelling.« less

Authors:
 [1];  [2];  [3];  [2];  [4];  [1];  [5]
  1. The Australian National Univ., Canberra, ACT (Australia)
  2. General Atomics, San Diego, CA (United States)
  3. Culham Centre for Fusion Energy (CCFE), Abingdon (United Kingdom)
  4. Oak Ridge Inst. for Science and Education (ORISE), Oak Ridge, TN (United States)
  5. Univ. of Wisconsin, Madison, WI (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1356341
Grant/Contract Number:  
FC02-04ER54698
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 2; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; non-axisymmetric coil; plasma response; magnetic perturbation; toroidal rotation; plasma resistivity

Citation Formats

Haskey, Shaun R., Lanctot, Matthew J., Liu, Y. Q., Paz-Soldan, Carlos A., King, Josh D., Blackwell, B. D., and Schmitz, Oliver. Effects of resistivity and rotation on the linear plasma response to non-axisymmetric magnetic perturbations on DIII-D. United States: N. p., 2015. Web. doi:10.1088/0741-3335/57/2/025015.
Haskey, Shaun R., Lanctot, Matthew J., Liu, Y. Q., Paz-Soldan, Carlos A., King, Josh D., Blackwell, B. D., & Schmitz, Oliver. Effects of resistivity and rotation on the linear plasma response to non-axisymmetric magnetic perturbations on DIII-D. United States. doi:10.1088/0741-3335/57/2/025015.
Haskey, Shaun R., Lanctot, Matthew J., Liu, Y. Q., Paz-Soldan, Carlos A., King, Josh D., Blackwell, B. D., and Schmitz, Oliver. Mon . "Effects of resistivity and rotation on the linear plasma response to non-axisymmetric magnetic perturbations on DIII-D". United States. doi:10.1088/0741-3335/57/2/025015. https://www.osti.gov/servlets/purl/1356341.
@article{osti_1356341,
title = {Effects of resistivity and rotation on the linear plasma response to non-axisymmetric magnetic perturbations on DIII-D},
author = {Haskey, Shaun R. and Lanctot, Matthew J. and Liu, Y. Q. and Paz-Soldan, Carlos A. and King, Josh D. and Blackwell, B. D. and Schmitz, Oliver},
abstractNote = {Parameter scans show the strong dependence of the plasma response on the poloidal structure of the applied field highlighting the importance of being able to control this parameter using non-axisymmetric coil sets. An extensive examination of the linear single fluid plasma response to n = 3 magnetic perturbations in L-mode DIII-D lower single null plasmas is presented. The effects of plasma resistivity, toroidal rotation and applied field structure are calculated using the linear single fluid MHD code, MARS-F. Measures which separate the response into a pitch-resonant and resonant field amplification (RFA) component are used to demonstrate the extent to which resonant screening and RFA occurs. The ability to control the ratio of pitch-resonant fields to RFA by varying the phasing between upper and lower resonant magnetic perturbations coils sets is shown. The predicted magnetic probe outputs and displacement at the x-point are also calculated for comparison with experiments. Additionally, modelling of the linear plasma response using experimental toroidal rotation profiles and Spitzer like resistivity profiles are compared with results which provide experimental evidence of a direct link between the decay of the resonant screening response and the formation of a 3D boundary. As a result, good agreement is found during the initial application of the MP, however, later in the shot a sudden drop in the poloidal magnetic probe output occurs which is not captured in the linear single fluid modelling.},
doi = {10.1088/0741-3335/57/2/025015},
journal = {Plasma Physics and Controlled Fusion},
number = 2,
volume = 57,
place = {United States},
year = {Mon Jan 05 00:00:00 EST 2015},
month = {Mon Jan 05 00:00:00 EST 2015}
}

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