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Title: Suppression of type-I ELMs with reduced RMP coil set on DIII-D

Abstract

Recent experiments on DIII-D have demonstrated that having a toroidally-monochromatic spectral content of edge-resonant magnetic perturbations (RMPs) is not a necessary condition for suppression of edge localized modes (ELMs). Robust ELM suppression has been reproducibly obtained on DIII-D during experiments in which various non-axisymmetric coil loops were turned off pseudo-randomly producing a variety of n=1 , n=2, and n=3 spectral contributions. It was demonstrated that RMP ELM suppression could be achieved with as few as 5 out of 12 internal coil loops (I-coils) on DIII-D at similar coil currents and with good plasma confinement. Linear MHD plasma response (M3DC1, IPEC, MARS) and vacuum (SURFMN, TRIP3D) modelling have been performed in order to understand the effects of the perturbation spectrum on the plasma response and ELM suppression. The results suggest that reduction of the dominant n=3 perturbation field is compensated by increased n=2 field in the plasma that may lead to RMP ELM suppression at lower levels of n=3 perturbative magnetic flux from the I-coils. In conclusion, these results provide additional confidence that ITER may be capable of RMP ELM suppression in the event of multiple internal coil failures.

Authors:
 [1];  [1];  [2];  [2];  [2];  [3];  [2];  [3];  [1];  [4];  [2];  [3];  [2];  [3];  [2];  [2];  [5]
  1. Univ. of California, San Diego, CA (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1311248
Alternate Identifier(s):
OSTI ID: 1238386; OSTI ID: 1353064
Grant/Contract Number:  
AC05-00OR22725; FG02-05ER54809; FC02-04ER54698; AC01-09CH11466; AC52-07NA27344; AC05-06OR23100
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 56; Journal Issue: 3; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; macroinstabilities; magnetic confinement; tokamaks; kinetic modes; plasma simulation

Citation Formats

Orlov, Dmitriy M., Moyer, Richard A., Evans, Todd E., Paz-Soldan, Carlos, Ferraro, Nathaniel M., Nazikian, Raffi, deGrassie, John S., Grierson, Brian A., Eldon, David, Fenstermacher, Max E., King, J. D., Logan, N. C., Lanctot, Matthew J., Maingi, R., Snyder, P. B., Strait, E. J., and Wingen, Andreas. Suppression of type-I ELMs with reduced RMP coil set on DIII-D. United States: N. p., 2016. Web. doi:10.1088/0029-5515/56/3/036020.
Orlov, Dmitriy M., Moyer, Richard A., Evans, Todd E., Paz-Soldan, Carlos, Ferraro, Nathaniel M., Nazikian, Raffi, deGrassie, John S., Grierson, Brian A., Eldon, David, Fenstermacher, Max E., King, J. D., Logan, N. C., Lanctot, Matthew J., Maingi, R., Snyder, P. B., Strait, E. J., & Wingen, Andreas. Suppression of type-I ELMs with reduced RMP coil set on DIII-D. United States. doi:10.1088/0029-5515/56/3/036020.
Orlov, Dmitriy M., Moyer, Richard A., Evans, Todd E., Paz-Soldan, Carlos, Ferraro, Nathaniel M., Nazikian, Raffi, deGrassie, John S., Grierson, Brian A., Eldon, David, Fenstermacher, Max E., King, J. D., Logan, N. C., Lanctot, Matthew J., Maingi, R., Snyder, P. B., Strait, E. J., and Wingen, Andreas. Fri . "Suppression of type-I ELMs with reduced RMP coil set on DIII-D". United States. doi:10.1088/0029-5515/56/3/036020. https://www.osti.gov/servlets/purl/1311248.
@article{osti_1311248,
title = {Suppression of type-I ELMs with reduced RMP coil set on DIII-D},
author = {Orlov, Dmitriy M. and Moyer, Richard A. and Evans, Todd E. and Paz-Soldan, Carlos and Ferraro, Nathaniel M. and Nazikian, Raffi and deGrassie, John S. and Grierson, Brian A. and Eldon, David and Fenstermacher, Max E. and King, J. D. and Logan, N. C. and Lanctot, Matthew J. and Maingi, R. and Snyder, P. B. and Strait, E. J. and Wingen, Andreas},
abstractNote = {Recent experiments on DIII-D have demonstrated that having a toroidally-monochromatic spectral content of edge-resonant magnetic perturbations (RMPs) is not a necessary condition for suppression of edge localized modes (ELMs). Robust ELM suppression has been reproducibly obtained on DIII-D during experiments in which various non-axisymmetric coil loops were turned off pseudo-randomly producing a variety of n=1 , n=2, and n=3 spectral contributions. It was demonstrated that RMP ELM suppression could be achieved with as few as 5 out of 12 internal coil loops (I-coils) on DIII-D at similar coil currents and with good plasma confinement. Linear MHD plasma response (M3DC1, IPEC, MARS) and vacuum (SURFMN, TRIP3D) modelling have been performed in order to understand the effects of the perturbation spectrum on the plasma response and ELM suppression. The results suggest that reduction of the dominant n=3 perturbation field is compensated by increased n=2 field in the plasma that may lead to RMP ELM suppression at lower levels of n=3 perturbative magnetic flux from the I-coils. In conclusion, these results provide additional confidence that ITER may be capable of RMP ELM suppression in the event of multiple internal coil failures.},
doi = {10.1088/0029-5515/56/3/036020},
journal = {Nuclear Fusion},
number = 3,
volume = 56,
place = {United States},
year = {2016},
month = {2}
}

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