A quasi-linear model of electromagnetic turbulent transport and its application to flux-driven transport predictions for STEP
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| Název: | A quasi-linear model of electromagnetic turbulent transport and its application to flux-driven transport predictions for STEP |
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| Autoři: | M. Giacomin, D. Dickinson, W. Dorland, N.R. Mandell, A. Bokshi, F.J. Casson, H.G. Dudding, D. Kennedy, B.S. Patel, C.M. Roach |
| Zdroj: | Journal of Plasma Physics. 91 |
| Publication Status: | Preprint |
| Informace o vydavateli: | Cambridge University Press (CUP), 2025. |
| Rok vydání: | 2025 |
| Témata: | Plasma Physics (physics.plasm-ph), fusion plasma, plasma confinement, plasma simulation, FOS: Physical sciences, 7. Clean energy, Physics - Plasma Physics |
| Popis: | A quasi-linear reduced transport model is developed from a database of high- $\beta$ 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. |
| Druh dokumentu: | Article |
| Popis souboru: | application/pdf |
| Jazyk: | English |
| ISSN: | 1469-7807 0022-3778 |
| DOI: | 10.1017/s0022377824001107 |
| DOI: | 10.48550/arxiv.2404.17453 |
| Přístupová URL adresa: | http://arxiv.org/abs/2404.17453 https://hdl.handle.net/11577/3547197 https://doi.org/10.1017/s0022377824001107 |
| Rights: | CC BY arXiv Non-Exclusive Distribution |
| Přístupové číslo: | edsair.doi.dedup.....5f24585bffa827b291b19861c68a223e |
| Databáze: | OpenAIRE |
Nájsť tento článok vo Web of Science | Abstrakt: | A quasi-linear reduced transport model is developed from a database of high- $\beta$ 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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| ISSN: | 14697807 00223778 |
| DOI: | 10.1017/s0022377824001107 |