Optimization of Nonlinear Turbulence in Stellarators
Fuente:
arXiv
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| Soggetti: | |
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| _version_ | 1866911782490079232 |
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| author | Kim, Patrick Buller, Stefan Conlin, Rory Dorland, William Dudt, Daniel W. Gaur, Rahul Jorge, Rogerio Kolemen, Egemen Landreman, Matt Mandell, Noah R. Panici, Dario |
| author_facet | Kim, Patrick Buller, Stefan Conlin, Rory Dorland, William Dudt, Daniel W. Gaur, Rahul Jorge, Rogerio Kolemen, Egemen Landreman, Matt Mandell, Noah R. Panici, Dario |
| contents | We present new stellarator equilibria that have been optimized for reduced turbulent transport using nonlinear gyrokinetic simulations within the optimization loop. The optimization routine involves coupling the pseudo-spectral GPU-native gyrokinetic code GX with the stellarator equilibrium and optimization code DESC. Since using GX allows for fast nonlinear simulations, we directly optimize for reduced nonlinear heat fluxes. To handle the noisy heat flux traces returned by these simulations, we employ the simultaneous perturbation stochastic approximation (SPSA) method that only uses two objective function evaluations for a simple estimate of the gradient. We show several examples that optimize for both reduced heat fluxes and good quasisymmetry as a proxy for low neoclassical transport. Finally, we run full transport simulations using the T3D stellarator transport code to evaluate the changes in the macroscopic profiles. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_18842 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Optimization of Nonlinear Turbulence in Stellarators Kim, Patrick Buller, Stefan Conlin, Rory Dorland, William Dudt, Daniel W. Gaur, Rahul Jorge, Rogerio Kolemen, Egemen Landreman, Matt Mandell, Noah R. Panici, Dario Plasma Physics We present new stellarator equilibria that have been optimized for reduced turbulent transport using nonlinear gyrokinetic simulations within the optimization loop. The optimization routine involves coupling the pseudo-spectral GPU-native gyrokinetic code GX with the stellarator equilibrium and optimization code DESC. Since using GX allows for fast nonlinear simulations, we directly optimize for reduced nonlinear heat fluxes. To handle the noisy heat flux traces returned by these simulations, we employ the simultaneous perturbation stochastic approximation (SPSA) method that only uses two objective function evaluations for a simple estimate of the gradient. We show several examples that optimize for both reduced heat fluxes and good quasisymmetry as a proxy for low neoclassical transport. Finally, we run full transport simulations using the T3D stellarator transport code to evaluate the changes in the macroscopic profiles. |
| title | Optimization of Nonlinear Turbulence in Stellarators |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2310.18842 |