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Title: Dynamic divertor control using resonant mixed toroidal harmonic magnetic fields during ELM suppression in DIII-D

Abstract

Experiments using Resonant Magnetic Perturbations (RMPs), with a rotating n = 2 toroidal harmonic combined with a stationary n = 3 toroidal harmonic, have validated predictions that divertor heat and particle flux can be dynamically controlled while maintaining Edge Localized Mode (ELM) suppression in the DIII-D tokamak. In this paper, n is the toroidal mode number. ELM suppression over one full cycle of a rotating n = 2 RMP that was mixed with a static n = 3 RMP field has been achieved. Prominent heat flux splitting on the outer divertor has been observed during ELM suppression by RMPs in low collisionality regime in DIII-D. Strong changes in the three dimensional heat and particle flux footprint in the divertor were observed during the application of the mixed toroidal harmonic magnetic perturbations. These results agree well with modeling of the edge magnetic field structure using the TOP2D code, which takes into account the plasma response from the MARS-F code. Finally, these results expand the potential effectiveness of the RMP ELM suppression technique for the simultaneous control of divertor heat and particle load required in ITER.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4];  [2];  [3]; ORCiD logo [3];  [5];  [4]; ORCiD logo [3];  [3];  [2];  [2];  [6];  [4];  [6];  [5];  [2]
+ Show Author Affiliations
  1. Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Plasma Physics; Univ. of Science and Technology of China, Hefei (China)
  2. Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Plasma Physics
  3. General Atomics, San Diego, CA (United States)
  4. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  5. Univ. of California, San Diego, CA (United States)
  6. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Univ. of California, San Diego, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Chinese Academy of Sciences (CAS), Hefei (China)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); National Natural Science Foundation of China (NNSFC); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1468446
Alternate Identifier(s):
OSTI ID: 1426847; OSTI ID: 1497943
Report Number(s):
LLNL-JRNL-758965
Journal ID: ISSN 1070-664X
Grant/Contract Number:  
FC02-04ER54698; AC02-09CH11466; FG02-05ER54809; AC52-07NA27344; 11475224
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; plasma confinement; plasma facing components; tokamaks; telecommunications engineering; sols; magnetic fields; cameras; thermography; numerical methods; thermodynamic states and processes; Physics - Plasma physics

Citation Formats

Jia, M., Sun, Y., Paz-Soldan, C., Nazikian, R., Gu, S., Liu, Y. Q., Abrams, T., Bykov, I., Cui, L., Evans, T., Garofalo, A., Guo, W., Gong, X., Lasnier, C., Logan, N. C., Makowski, M., Orlov, D., and Wang, H. H. Dynamic divertor control using resonant mixed toroidal harmonic magnetic fields during ELM suppression in DIII-D. United States: N. p., 2018. Web. doi:10.1063/1.5019777.
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Jia, M., Sun, Y., Paz-Soldan, C., Nazikian, R., Gu, S., Liu, Y. Q., Abrams, T., Bykov, I., Cui, L., Evans, T., Garofalo, A., Guo, W., Gong, X., Lasnier, C., Logan, N. C., Makowski, M., Orlov, D., & Wang, H. H. Dynamic divertor control using resonant mixed toroidal harmonic magnetic fields during ELM suppression in DIII-D. United States. doi:10.1063/1.5019777.
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Jia, M., Sun, Y., Paz-Soldan, C., Nazikian, R., Gu, S., Liu, Y. Q., Abrams, T., Bykov, I., Cui, L., Evans, T., Garofalo, A., Guo, W., Gong, X., Lasnier, C., Logan, N. C., Makowski, M., Orlov, D., and Wang, H. H. Mon . "Dynamic divertor control using resonant mixed toroidal harmonic magnetic fields during ELM suppression in DIII-D". United States. doi:10.1063/1.5019777. https://www.osti.gov/servlets/purl/1468446.
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@article{osti_1468446,
title = {Dynamic divertor control using resonant mixed toroidal harmonic magnetic fields during ELM suppression in DIII-D},
author = {Jia, M. and Sun, Y. and Paz-Soldan, C. and Nazikian, R. and Gu, S. and Liu, Y. Q. and Abrams, T. and Bykov, I. and Cui, L. and Evans, T. and Garofalo, A. and Guo, W. and Gong, X. and Lasnier, C. and Logan, N. C. and Makowski, M. and Orlov, D. and Wang, H. H.},
abstractNote = {Experiments using Resonant Magnetic Perturbations (RMPs), with a rotating n = 2 toroidal harmonic combined with a stationary n = 3 toroidal harmonic, have validated predictions that divertor heat and particle flux can be dynamically controlled while maintaining Edge Localized Mode (ELM) suppression in the DIII-D tokamak. In this paper, n is the toroidal mode number. ELM suppression over one full cycle of a rotating n = 2 RMP that was mixed with a static n = 3 RMP field has been achieved. Prominent heat flux splitting on the outer divertor has been observed during ELM suppression by RMPs in low collisionality regime in DIII-D. Strong changes in the three dimensional heat and particle flux footprint in the divertor were observed during the application of the mixed toroidal harmonic magnetic perturbations. These results agree well with modeling of the edge magnetic field structure using the TOP2D code, which takes into account the plasma response from the MARS-F code. Finally, these results expand the potential effectiveness of the RMP ELM suppression technique for the simultaneous control of divertor heat and particle load required in ITER.},
doi = {10.1063/1.5019777},
journal = {Physics of Plasmas},
number = 5,
volume = 25,
place = {United States},
year = {2018},
month = {3}
}
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DOI:  10.1063/1.5019777
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