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A survey of pedesta...
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Curie, M. T.Univ Texas Austin, Inst Fus Studies, Austin, TX 78705 USA.
(author)
A survey of pedestal magnetic fluctuations using gyrokinetics and a global reduced model for microtearing stability
- Article/chapterEnglish2022
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AIP Publishing,2022
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LIBRIS-ID:oai:DiVA.org:kth-312808
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-312808URI
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https://doi.org/10.1063/5.0084842DOI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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QC 20220524
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This article presents a global reduced model for slab-like microtearing modes (MTMs) in the H-mode pedestal, which reproduces distinctive features of experimentally observed magnetic fluctuations, such as chirping and discrete frequency bands at noncontiguous mode numbers. Our model, importantly, includes the global variation of the diamagnetic frequencies, which is necessary to reproduce the experimental observations. The key insight underlying this model is that MTM instability is enabled by the alignment of a rational surface with the peak in the profile of the diamagnetic frequency. Conversely, MTMs are strongly stabilized for toroidal mode numbers for which these quantities are misaligned. This property explains the discrete fluctuation bands in several DIII-D and JET discharges, which we survey using our reduced model in conjunction with global gyrokinetic simulations. A fast yet accurate reduced model for MTMs enables rapid interpretation of magnetic fluctuation data from a wide range of experimental conditions to help assess the role of MTM in the pedestal.
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Larakers, J. L.Univ Texas Austin, Inst Fus Studies, Austin, TX 78705 USA.
(author)
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Hatch, D. R.Univ Texas Austin, Inst Fus Studies, Austin, TX 78705 USA.
(author)
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Nelson, A. O.Columbia Univ, New York, NY 10027 USA.
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Diallo, A.Princeton Plasma Phys Lab, Princeton, NJ 08536 USA.
(author)
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Hassan, E.Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA.;Ain Shams Univ, Fac Sci, Phys, Cairo 11566, Egypt.
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Guttenfelder, W.Princeton Plasma Phys Lab, Princeton, NJ 08536 USA.
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Halfmoon, M.Univ Texas Austin, Inst Fus Studies, Austin, TX 78705 USA.
(author)
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Kotschenreuther, M.Univ Texas Austin, Inst Fus Studies, Austin, TX 78705 USA.
(author)
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Hazeltine, R. D.Univ Texas Austin, Inst Fus Studies, Austin, TX 78705 USA.
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Mahajan, S. M.Univ Texas Austin, Inst Fus Studies, Austin, TX 78705 USA.
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Groebner, R. J.Gen Atom, San Diego, CA 85608 USA.
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Chen, J.Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA.
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Perez von Thun, C.Inst Plasma Phys & Laser Microfus, PL-01497 Warsaw, Poland.
(author)
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Frassinetti, LorenzoKTH,Fusionsplasmafysik(Swepub:kth)u1sfgalb
(author)
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Saarelma, S.Culham Sci Ctr, CCFE, Abingdon OX14 3DB, England.
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Giroud, C.Culham Sci Ctr, CCFE, Abingdon OX14 3DB, England.
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JET Contributors, M. M.Univ Texas Austin, Inst Fus Studies, Austin, TX 78705 USA.
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Tennery, M. M.
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Univ Texas Austin, Inst Fus Studies, Austin, TX 78705 USA.Columbia Univ, New York, NY 10027 USA.
(creator_code:org_t)
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In:Physics of Plasmas: AIP Publishing29:4, s. 042503-1070-664X1089-7674
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Curie, M. T.
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Larakers, J. L.
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Hatch, D. R.
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Nelson, A. O.
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Diallo, A.
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Hassan, E.
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Guttenfelder, W.
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Halfmoon, M.
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Kotschenreuther, ...
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Hazeltine, R. D.
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Mahajan, S. M.
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Groebner, R. J.
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Chen, J.
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Perez von Thun, ...
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Frassinetti, Lor ...
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Saarelma, S.
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Giroud, C.
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JET Contributors ...
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Tennery, M. M.
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