M3D-C1 simulations of the plasma response to RMPs in NSTX-U single-null and snowflake divertor configurations

Canal, G. P.; Ferraro, N. M.; Evans, T. E.; Osborne, T. H.; Menard, J. E.; Ahn, J. -W.; Maingi, R.; Wingen, A.; Ciro, D.; Frerichs, H.; Schmitz, O.; Soukhanoviskii, V.; Waters, I.; Sabbagh, S. A.

doi:10.1088/1741-4326/aa6e10

Title: M3D-C1 simulations of the plasma response to RMPs in NSTX-U single-null and snowflake divertor configurations

Journal Article · Thu Apr 20 00:00:00 EDT 2017 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aa6e10· OSTI ID:1373377

Canal, G. P. ^[1]; Ferraro, N. M. ^[2]; Evans, T. E. ^[3]; Osborne, T. H. ^[3]; Menard, J. E. ^[2]; Ahn, J. -W. ^[4]; Maingi, R. ^[2]; Wingen, A. ^[4]; Ciro, D. ^[5]; Frerichs, H. ^[6]; Schmitz, O. ^[6]; Soukhanoviskii, V. ^[7]; Waters, I. ^[6]; Sabbagh, S. A. ^[8]

General Atomics, San Diego, CA (United States); Oak Ridge Associated Univ., Oak Ridge, TN (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
General Atomics, San Diego, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Sao Paulo (Brazil). Dept. of Applied Physics
Univ. of Wisconsin, Madison, WI (United States). Dept. of Engineering Physics
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Columbia Univ., New York, NY (United States). Dept. of Applied Physics and Applied Mathematics

Non-axisymmetric control coils and the so-called snow ake divertor con guration are two potential solutions proposed to solve two separate outstanding issues on the path towards self-sustained burning plasma operations, namely the transient energy bursts caused by edge localized modes and the steady state heat exhaust problem. In a reactor, these two proposed solutions would have to operate simultaneously and it is, therefore, important to investigate their compatibility and to identify possible con icts that could prevent them from operating simultaneously. In this work, single- and two- uid resistive magnetohydrodynamic calculations are used to investigate the e ect of externally applied n = 3 magnetic perturbations on the snow ake divertor con guration. The calculations are performed using the code M3D-C1 and are based on simulated NSTX-U plasmas. The results show that additional and longer magnetic lobes are created in the null-point region of the snow ake con guration, compared to those in the conventional single-null. The intersection of these longer and additional lobes with the divertor plates are expected to cause more striations in the particle and heat ux target pro les. In addition, the results indicate that the size of the magnetic lobes, in both single-null and snow ake con gurations, are more sensitive to resonant magnetic perturbations than to non-resonant magnetic perturbations. The results also suggest that lower values of current in nonaxisymmetric control coils closer to the null-point region would be required to suppress edge localized modes. This e ect is expected to be enhanced in plasmas with the snow ake con guration.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: SC0012706; FC02-04ER54698; AC05-06OR23100; AC02-09CH11466; AC05-00OR22725; SC0012315; SC0013911; AC52-07NA27344; SC0008520

OSTI ID:: 1373377

Alternate ID(s):: OSTI ID: 1374813; OSTI ID: 1376338; OSTI ID: 1771442

Report Number(s):: LLNL-JRNL-820478

Journal Information:: Nuclear Fusion, Vol. 57, Issue 7; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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References (35)

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