Optimisation of confinement in a fusion reactor using a nonlinear turbulence model

Highcock, E. G.; Mandell, N. R.; Barnes, M.; Dorland, W.

doi:10.1017/s002237781800034x

Title: Optimisation of confinement in a fusion reactor using a nonlinear turbulence model

Journal Article · Mon Apr 23 00:00:00 EDT 2018 · Journal of Plasma Physics

DOI:https://doi.org/10.1017/s002237781800034x· OSTI ID:1538938

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Chalmers University of Technology, Gothenburg (Sweden); Rudolph Peierls Centre for Theoretical Physics, Oxford (United Kingdom); Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)
Princeton University, NJ (United States)
Rudolph Peierls Centre for Theoretical Physics, Oxford (United Kingdom)
University of Maryland, College Park, MD (United States)

We report the confinement of heat in the core of a magnetic fusion reactor is optimised using a multidimensional optimisation algorithm. For the first time in such a study, the loss of heat due to turbulence is modelled at every stage using first-principles nonlinear simulations which accurately capture the turbulent cascade and large-scale zonal flows. The simulations utilise a novel approach, with gyrofluid treatment of the small-scale drift waves and gyrokinetic treatment of the large-scale zonal flows. A simple near-circular equilibrium with standard parameters is chosen as the initial condition. The figure of merit, fusion power per unit volume, is calculated, and then two control parameters, the elongation and triangularity of the outer flux surface, are varied, with the algorithm seeking to optimise the chosen figure of merit. A twofold increase in the plasma power per unit volume is achieved by moving to higher elongation and strongly negative triangularity.

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Research Organization:: Krell Institute, Ames, IA (United States); Univ. of Maryland, College Park, MD (United States)

Sponsoring Organization:: USDOE Office of Science (SC); Euratom Research and Training Programme; European Commission (EC); Swedish Research Council (SRC)

Grant/Contract Number:: FG02-97ER25308; 633053; 2014–5392

OSTI ID:: 1538938

Journal Information:: Journal of Plasma Physics, Vol. 84, Issue 2; ISSN 0022-3778

Publisher:: Cambridge University PressCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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