Validation of nonlinear gyrokinetic simulations of L- and I-mode plasmas on Alcator C-Mod

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New validation of global, nonlinear, ion-scale gyrokinetic simulations (GYRO) is carried out for L- and I-mode plasmas on AlcatorC-Mod, utilizing heat fluxes, profile stiffness, and temperature fluctuations. Previous work at C-Mod found that ITG/TEM-scale GYRO simulations can match both electron and ion heat fluxes within error bars in I-mode [White PoP 2015], suggesting that multi-scale (cross-scale coupling) effects [Howard PoP 2016] may be less important in I-mode than in L- mode. New results presented here, however, show that global, nonlinear, ion-scale GYRO simulations are able to match the experimental ion heat flux, but underpredict electron heat flux (at most radii), electron temperature fluctuations, and perturbative thermal diffusivity in both L- and I-mode. Linear addition of electron heat flux from electron scale runs does not resolve this discrepancy. These results indicate that single-scale simulations do not sufficiently describe the I-mode core transport, and that multi-scale (coupled electron- and ion-scale) transport models are needed. A preliminary investigation with multi-scale TGLF, however, was unable to resolve the discrepancy between ion-scale GYRO and experimental electron heat fluxes and perturbative diffusivity, motivating further work with multi-scale GYRO simulations and a more comprehensive study with multi-scale TGLF. Published by AIP Publishing.
Publisher
AMER INST PHYSICS
Issue Date
2017-05
Language
English
Article Type
Article; Proceedings Paper
Citation

PHYSICS OF PLASMAS, v.24, no.5

ISSN
1070-6631
DOI
10.1063/1.4977466
URI
http://hdl.handle.net/10203/272792
Appears in Collection
NE-Journal Papers(저널논문)
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