Observation of a Multimode Plasma Response and its Relationship to Density Pumpout and Edge-Localized Mode Suppression

Paz-Soldan, C.; Nazikian, R.; Haskey, S. R.; Logan, N. C.; Strait, E. J.; Ferraro, N. M.; Hanson, J. M.; King, J. D.; Lanctot, M. J.; Moyer, R. A.; Okabayashi, M.; Park, J-K.; Shafer, M. W.; Tobias, B. J.

doi:10.1103/PhysRevLett.114.105001

Observation of a Multimode Plasma Response and its Relationship to Density Pumpout and Edge-Localized Mode Suppression

Journal Article · Thu Mar 12 00:00:00 EDT 2015 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.114.105001· OSTI ID:1295122

Paz-Soldan, C. ^[1]; Nazikian, R. ^[2]; Haskey, S. R. ^[3]; Logan, N. C. ^[2]; Strait, E. J. ^[1]; Ferraro, N. M. ^[1]; Hanson, J. M. ^[4]; King, J. D. ^[1]; Lanctot, M. J. ^[1]; Moyer, R. A. ^[5]; Okabayashi, M. ^[2]; Park, J-K. ^[2]; Shafer, M. W. ^[6]; Tobias, B. J. ^[2]

General Atomics, San Diego, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Australian National Univ., Canberra, ACT (Australia). Plasma Research Lab.
Columbia Univ., New York, NY (United States)
Univ. of California, San Diego, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

We show density pumpout and edge-localized mode (ELM) suppression by applied n = 2 magnetic fields in low-collisionality DIII-D plasmas to be correlated with the magnitude of the plasma response driven on the high-field side (HFS) of the magnetic axis but not the low-field side (LFS) midplane. These distinct responses are a direct measurement of a multimodal magnetic plasma response, with each structure preferentially excited by a different n = 2 applied spectrum and preferentially detected on the LFS or HFS. Ideal and resistive magneto-hydrodynamic (MHD) calculations find that the LFS measurement is primarily sensitive to the excitation of stable kink modes, while the HFS measurement is primarily sensitive to resonant currents (whether fully shielding or partially penetrated). Finally, the resonant currents are themselves strongly modified by kink excitation, with the optimal applied field pitch for pumpout and ELM suppression significantly differing from equilibrium field alignment.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: AC05-00OR22725; FC02-04ER54698; AC02-09CH11466; FG02-04ER54761; AC05-06OR23100; SC0001961

OSTI ID:: 1295122

Alternate ID(s):: OSTI ID: 1329636
OSTI ID: 1180288

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 114; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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