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

Abstract

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 multi-modal 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 MHD calculations find that the LFS measurement is primarily sensitive to excitation of stable kink modes, while the HFS measurement is primarily sensitive to resonant currents (whether fully shielding or partially penetrated). Lastly, 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.

Authors:
 [1];  [2];  [3];  [2];  [1];  [1];  [4];  [1];  [1];  [5];  [2];  [2];  [6];  [2]
  1. General Atomics, San Diego, CA (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Australian National Univ., Canberra, ACT (Australia). Plasma Research Lab.
  4. Columbia Univ., New York, NY (United States)
  5. Univ. of California, San Diego, CA (United States)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1295122
Alternate Identifier(s):
OSTI ID: 1180288; OSTI ID: 1329636
Grant/Contract Number:  
AC05-00OR22725; FC02-04ER54698; AC02-09CH11466; FG02-04ER54761; AC05-06OR23100; SC0001961
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 114; Journal Issue: 10; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ELM suppression; edge-localized mode; ELM

Citation Formats

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., and Tobias, B. J. Observation of a Multimode Plasma Response and its Relationship to Density Pumpout and Edge-Localized Mode Suppression. United States: N. p., 2015. Web. doi:10.1103/PhysRevLett.114.105001.
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. Observation of a Multimode Plasma Response and its Relationship to Density Pumpout and Edge-Localized Mode Suppression. United States. https://doi.org/10.1103/PhysRevLett.114.105001
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., and Tobias, B. J. Thu . "Observation of a Multimode Plasma Response and its Relationship to Density Pumpout and Edge-Localized Mode Suppression". United States. https://doi.org/10.1103/PhysRevLett.114.105001. https://www.osti.gov/servlets/purl/1295122.
@article{osti_1295122,
title = {Observation of a Multimode Plasma Response and its Relationship to Density Pumpout and Edge-Localized Mode Suppression},
author = {Paz-Soldan, C. and Nazikian, R. and Haskey, S. R. and Logan, N. C. and Strait, E. J. and Ferraro, N. M. and Hanson, J. M. and King, J. D. and Lanctot, M. J. and Moyer, R. A. and Okabayashi, M. and Park, J-K. and Shafer, M. W. and Tobias, B. J.},
abstractNote = {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 multi-modal 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 MHD calculations find that the LFS measurement is primarily sensitive to excitation of stable kink modes, while the HFS measurement is primarily sensitive to resonant currents (whether fully shielding or partially penetrated). Lastly, 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.},
doi = {10.1103/PhysRevLett.114.105001},
journal = {Physical Review Letters},
number = 10,
volume = 114,
place = {United States},
year = {Thu Mar 12 00:00:00 EDT 2015},
month = {Thu Mar 12 00:00:00 EDT 2015}
}

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