A quasi-linear model of electromagnetic turbulent transport and its application to flux-driven transport predictions for STEP

Giacomin, Maurizio; Dickinson, D.; Dorland, W.; Mandell, N. R.; Bokshi, A.; Casson, F. J.; Dudding, H. G.; Kennedy, D.; Patel, B. S.; Roach, C. M.

doi:10.1017/s0022377824001107

Title: A quasi-linear model of electromagnetic turbulent transport and its application to flux-driven transport predictions for STEP

Journal Article · 09 January 2025 · Journal of Plasma Physics

DOI: https://doi.org/10.1017/s0022377824001107 · OSTI ID:2504550

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Università degli Studi di Padova (Italy); University of York (United Kingdom)
University of York (United Kingdom)
University of Maryland, College Park, MD (United States)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
UK Atomic Energy Authority (UKAEA), Culham (United Kingdom)

A quasi-linear reduced transport model is developed from a database of high-β electromagnetic nonlinear gyrokinetic simulations performed with spherical tokamak for energy production (STEP) relevant parameters. The quasi-linear model is fully electromagnetic and accounts for the effect of equilibrium flow shear using a novel approach. Its flux predictions are shown to agree quantitatively with predictions from local nonlinear gyrokinetic simulations across a broad range of STEP-relevant local equilibria. This reduced transport model is implemented in the T3D transport solver that is used to perform the first flux-driven simulations for STEP to account for transport from hybrid kinetic ballooning mode turbulence, which dominates over a wide region of the core plasma. Nonlinear gyrokinetic simulations of the final transport steady state from T3D return turbulent fluxes that are consistent with the reduced model, indicating that the quasi-linear model may also be appropriate for describing the transport steady state. Within the assumption considered here, our simulations support the existence of a transport steady state in STEP with a fusion power comparable to that in the burning flat top of the conceptual design, but do not demonstrate how this state can be accessed.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: Engineering and Physical Sciences Research Council (EPSRC); USDOE

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 2504550

Journal Information:: Journal of Plasma Physics, Journal Name: Journal of Plasma Physics Journal Issue: 1 Vol. 91; ISSN 0022-3778

Publisher:: Cambridge University PressCopyright Statement

Country of Publication:: United States

Language:: English

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Title: A quasi-linear model of electromagnetic turbulent transport and its application to flux-driven transport predictions for STEP

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