Tractable flux-driven temperature, density, and rotation profile evolution with the quasilinear gyrokinetic transport model QuaLiKiz

Citrin, J.; Bourdelle, C.; Casson, F. J.; Angioni, C.; Bonanomi, N.; Camenen, Y.; Garbet, X.; Garzotti, L.; Görler, T.; Gürcan, Özgür; Koechl, F.; Imbeaux, F.; Linder, O.; Plassche, K. L. van de; Strand, Pär; Szepesi, G.; Contributors, Jet

doi:10.1088/1361-6587/aa8aeb

Cited by 80 publications

(149 citation statements)

References 76 publications

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“…Thus, this study indicates that nonlinear effects leading to a lack of justification of linear E ×B stabilization models is limited to cases with significant PVG impact. This is in line with findings from quasilinear transport modeling in integrated modeling, where including the E×B stabilization in the inner half-radius (where PVG is more important) leads to an overprediction of the E ×B turbulence suppression and the temperature and density profiles [28].…”

Section: Application To Simulation Datasupporting

confidence: 90%

Growth rates of ITG modes in the presence of flow shear

et al. 2019

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Plasma microinstabilities in toroidal magnetic confinement devices can be driven unstable by a radial ion temperature gradient, and stabilized by rotational flow shear. In this study we argue that these nonlinear dynamics can be captured by the linear stabilization of Floquet modes. To that end, we propose a novel method (the τAC method) to calculate growth rates by averaging over linear Floquet modes. The τAC method is compared to nonlinear and other linear approaches, and is shown to work well at low parallel velocity gradient drive. As such, the method provides a promising approach to explore the parameter dependencies of flow shear stabilization.

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Section: Application To Simulation Datasupporting

confidence: 90%

Growth rates of ITG modes in the presence of flow shear

et al. 2019

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“…The QuaLiKiz output fluxes (per m 2 ) are (circular) flux-surface-averaged, and the full flux surface area is used to calculate the total transport rates within JETTO. The effective diffusivities and heat conductivities calculated from these fluxes within QuaLiKiz are transformed into JETTO coordinates, using general geometry information from JETTO [16]. The impact of poloidal asymmetries for turbulent transport of heavy impurities is included, see a comparaison with GKW here [16].…”

Section: Jet-ilw Plasma Profiles and W Core Accumulation Phenomenonmentioning

confidence: 99%

“…Therefore there are empty regions in D turb,ef f that are not empty in RV turb,ef f , and since it is averaged over 0.1s, in some cases both D turb,ef f and RV turb,ef f can be incorporated. The impact of poloidal asymmetries on W turbulent transport is accounted for in QuaLiKiz based on [39], as described in [16]. The impact of centrifugal effects on the various components of the turbulent convection (thermodiffusion, rotodiffusion, pure convection) results of a complex compensation of the different components (see [39]) leading, in this case, to a reduced turbulent W transport in absence of rotation.…”

Section: Toroidal Rotationmentioning

confidence: 99%

First principle integrated modeling of multi-channel transport including Tungsten in JET

et al. 2018

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For the first time, over five confinement times, the self-consistent flux driven time evolution of heat, momentum transport and particle fluxes of electrons and multiple ions including Tungsten (W) is modeled within the integrated modeling platform JETTO [Romanelli M et al PFR 2014], using first principle-based codes: namely, QuaLiKiz [Bourdelle C. et al. PPCF 2016] for turbulent transport and NEO [Belli E A and Candy J PPCF 2008] for neoclassical transport. For a JET-ILW pulse, the evolution of measured temperatures, rotation and density profiles are successfully predicted and the observed W central core accumulation is obtained. The poloidal asymmetries of the W density modfying its neoclassical and turbulent transport are accounted for. Actuators of the W core accumulation are studied: removing the central particle source annihilates the central W accumulation whereas the suppression of the torque reduces significantly the W central accumulation. Finally, the presence of W slightly reduces main ion heat turbulent transport through complex nonlinear interplays involving radiation, effective charge impact on ITG and collisionality.

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“…The development and validation of theory-based reduced models and integrated modelling frameworks in recent years (Kinsey et al 2011;Citrin et al 2017;Kim et al 2017;Meneghini et al 2017;Linder et al 2018;Rodriguez-Fernandez et al 2018;Angioni et al 2019;White 2019) have allowed physic-based simulations to also inform the design of SPARC during the early stages of its development. This paper presents results from both empirical scalings and integrated modelling simulations of SPARC plasmas, with a focus on evaluating fusion gain with theory-based models and assessing the sensitivity to plasma physics assumptions.…”

Section: Introductionmentioning

confidence: 99%

Predictions of core plasma performance for the SPARC tokamak

et al. 2020

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SPARC is designed to be a high-field, medium-size tokamak aimed at achieving net energy gain with ion cyclotron range-of-frequencies (ICRF) as its primary auxiliary heating mechanism. Empirical predictions with conservative physics indicate that SPARC baseline plasmas would reach $Q\approx 11$ , which is well above its mission objective of $Q>2$ . To build confidence that SPARC will be successful, physics-based integrated modelling has also been performed. The TRANSP code coupled with the theory-based trapped gyro-Landau fluid (TGLF) turbulence model and EPED predictions for pedestal stability find that $Q\approx 9$ is attainable in standard H-mode operation and confirms $Q > 2$ operation is feasible even with adverse assumptions. In this analysis, ion cyclotron waves are simulated with the full wave TORIC code and alpha heating is modelled with the Monte–Carlo fast ion NUBEAM module. Detailed analysis of expected turbulence regimes with linear and nonlinear CGYRO simulations is also presented, demonstrating that profile predictions with the TGLF reduced model are in reasonable agreement.

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Tractable flux-driven temperature, density, and rotation profile evolution with the quasilinear gyrokinetic transport model QuaLiKiz

Cited by 80 publications

References 76 publications

Growth rates of ITG modes in the presence of flow shear

Growth rates of ITG modes in the presence of flow shear

First principle integrated modeling of multi-channel transport including Tungsten in JET

Predictions of core plasma performance for the SPARC tokamak

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