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

Haskey, Shaun R.; Lanctot, Matthew J.; Liu, Y. Q.; Paz-Soldan, Carlos A.; King, Josh D.; Blackwell, B. D.; Schmitz, Oliver

doi:10.1088/0741-3335/57/2/025015

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

Journal Article · Mon Jan 05 00:00:00 EST 2015 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/0741-3335/57/2/025015· OSTI ID:1356341

Haskey, Shaun R. ^[1]; Lanctot, Matthew J. ^[2]; Liu, Y. Q. ^[3]; Paz-Soldan, Carlos A. ^[2]; King, Josh D. ^[4]; Blackwell, B. D. ^[1]; Schmitz, Oliver ^[5]

The Australian National Univ., Canberra, ACT (Australia)
General Atomics, San Diego, CA (United States)
Culham Centre for Fusion Energy (CCFE), Abingdon (United Kingdom)
Oak Ridge Inst. for Science and Education (ORISE), Oak Ridge, TN (United States)
Univ. of Wisconsin, Madison, WI (United States)

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.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: FC02-04ER54698

OSTI ID:: 1356341

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 57, Issue 2; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 33 works

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non-axisymmetric coil
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plasma resistivity

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

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