Gyrokinetic Calculations of Microinstabilities and Transport During RF H-Modes on Alcator C-Mod

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Physics understanding for the experimental improvement of particle and energy confinement is being advanced through massively parallel calculations of microturbulence for simulated plasma conditions. The ultimate goal, an experimentally validated, global, non-local, fully nonlinear calculation of plasma microturbulence is still not within reach, but extraordinary progress has been achieved in understanding microturbulence, driving forces and the plasma response in recent years. In this paper we discuss gyrokinetic simulations of plasma turbulence being carried out to examine a reproducible, H-mode, RF heated experiment on the Alcator CMOD tokamak3, which exhibits an internal transport barrier (ITB). This off axis RF case represents ... continued below

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218 Kilobytes pages

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Redi, M.H.; Fiore, C.; Bonoli, P.; Bourdelle, C.; Budny, R.; Dorland, W.D. et al. June 18, 2002.

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Physics understanding for the experimental improvement of particle and energy confinement is being advanced through massively parallel calculations of microturbulence for simulated plasma conditions. The ultimate goal, an experimentally validated, global, non-local, fully nonlinear calculation of plasma microturbulence is still not within reach, but extraordinary progress has been achieved in understanding microturbulence, driving forces and the plasma response in recent years. In this paper we discuss gyrokinetic simulations of plasma turbulence being carried out to examine a reproducible, H-mode, RF heated experiment on the Alcator CMOD tokamak3, which exhibits an internal transport barrier (ITB). This off axis RF case represents the early phase of a very interesting dual frequency RF experiment, which shows density control with central RF heating later in the discharge. The ITB exhibits steep, spontaneous density peaking: a reduction in particle transport occurring without a central particle source. Since the central temperature is maintained while the central density is increasing, this also suggests a thermal transport barrier exists. TRANSP analysis shows that ceff drops inside the ITB. Sawtooth heat pulse analysis also shows a localized thermal transport barrier. For this ICRF EDA H-mode, the minority resonance is at r/a * 0.5 on the high field side. There is a normal shear profile, with q monotonic.

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218 Kilobytes pages

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INIS; OSTI as DE00798196

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  • Other Information: PBD: 18 Jun 2002

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  • Report No.: PPPL-3707.pdf
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/798196 | External Link
  • Office of Scientific & Technical Information Report Number: 798196
  • Archival Resource Key: ark:/67531/metadc738209

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  • June 18, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • April 15, 2016, 10:01 p.m.

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Redi, M.H.; Fiore, C.; Bonoli, P.; Bourdelle, C.; Budny, R.; Dorland, W.D. et al. Gyrokinetic Calculations of Microinstabilities and Transport During RF H-Modes on Alcator C-Mod, report, June 18, 2002; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc738209/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.