Observation of a multimode plasma response and its relationship to density pumpout and edge-localized mode suppression.

Autor:	Paz-Soldan C; General Atomics, San Diego, California 92121, USA., Nazikian R; Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA., Haskey SR; Plasma Research Laboratory, Australian National University, Canberra, Australian Capital Territory 0200, Australia., Logan NC; Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA., Strait EJ; General Atomics, San Diego, California 92121, USA., Ferraro NM; General Atomics, San Diego, California 92121, USA., Hanson JM; Columbia University, New York, New York 10027, USA., King JD; General Atomics, San Diego, California 92121, USA., Lanctot MJ; General Atomics, San Diego, California 92121, USA., Moyer RA; University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0417, USA., Okabayashi M; Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA., Park JK; Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA., Shafer MW; Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6169, USA., Tobias BJ; Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
Jazyk:	angličtina
Zdroj:	Physical review letters [Phys Rev Lett] 2015 Mar 13; Vol. 114 (10), pp. 105001. Date of Electronic Publication: 2015 Mar 12.
DOI:	10.1103/PhysRevLett.114.105001
Abstrakt:	Density pumpout and edge-localized mode (ELM) suppression by applied n=2 magnetic fields in low-collisionality DIII-D plasmas are shown 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). 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.
Databáze:	MEDLINE
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