ELM suppression in helium plasmas with 3D magnetic fields

Evans, T. E.; Loarte, A.; Orlov, D. M.; Grierson, B. A.; Knolker, M. M.; Lyons, B. C.; Cui, L.; Gohil, P.; Groebner, R. J.; Moyer, R. A.; Nazikian, R.; Osborne, T. H.; Unterberg, E. A.

doi:10.1088/1741-4326/aa7530

Title: ELM suppression in helium plasmas with 3D magnetic fields

Journal Article · Wed Jun 21 00:00:00 EDT 2017 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aa7530· OSTI ID:1373695

Evans, T. E. ^[1]; Loarte, A. ^[2]; Orlov, D. M. ^[3]; Grierson, B. A. ^[4]; Knolker, M. M. ^[5]; Lyons, B. C. ^[6]; Cui, L. ^[4]; Gohil, P. ^[1]; Groebner, R. J. ^[1]; Moyer, R. A. ^[3]; Nazikian, R. ^[4]; Osborne, T. H. ^[1]; Unterberg, E. A. ^[7]

General Atomics, San Diego, CA (United States)
ITER Organization, St. Paul lez Durance (France)
Univ. of California San Diego, La Jolla, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Ludwig Maximilian Univ., Munich (Germany)
General Atomics, San Diego, CA (United States); Oak Ridge Institute for Science Education, Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Experiments in DIII-D, using non-axisymmetric magnetic perturbation fields in high-purity low toroidal rotation, ⁴He plasmas have resulted in Type-I edge localized mode (ELM) suppression and mitigation. Suppression is obtained in plasmas with zero net input torque near the L–H power threshold using either electron cyclotron resonant heating (ECRH) or balanced co- and counter-I _p neutral beam injection (NBI) resulting in conditions equivalent to those expected in ITER's non-active operating phase. In low-power ECRH H-modes, periods with uncontrolled density and impurity radiation excursions are prevented by applying n = 3 non-axisymmetric magnetic perturbation fields. ELM suppression results from a reduction and an outward shift of the electron pressure gradient peak compared to that in the high-power ELMing phase. Here, the change in the electron pressure gradient peak is primarily due to a drop in the pedestal temperature rather than the pedestal density.

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

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FC02-04ER54698; AC05-00OR22725

OSTI ID:: 1373695

Alternate ID(s):: OSTI ID: 1374585; OSTI ID: 1503986

Journal Information:: Nuclear Fusion, Vol. 57, Issue 8; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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Predict-first experimental analysis using automated and integrated magnetohydrodynamic modeling Lyons, B. C.; Paz-Soldan, C.; Meneghini, O. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5025838	journal	May 2018
Penetration properties of resonant magnetic perturbation in EAST Tokamak Zhang, H. W.; Ma, Z. W.; Zhang, W. Physics of Plasmas, Vol. 26, Issue 11 https://doi.org/10.1063/1.5116669	journal	November 2019
Grassy-ELM regime with edge resonant magnetic perturbations in fully noninductive plasmas in the DIII-D tokamak Nazikian, R.; Petty, C. C.; Bortolon, A. Nuclear Fusion, Vol. 58, Issue 10 https://doi.org/10.1088/1741-4326/aad20d	journal	July 2018

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Title: ELM suppression in helium plasmas with 3D magnetic fields

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