Quasilinear gyrokinetic theory: a derivation of QuaLiKiz

Stephens, C. D.; Garbet, X.; Citrin, J.; Bourdelle, C.; Plassche, K. L. van de; Jenko, F.

doi:10.1017/s0022377821000763

Cited by 12 publications

(16 citation statements)

References 68 publications

(94 reference statements)

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“…The first step in the validation exercise is to ascertain whether QuaLiKiz can reproduce the kinetic profiles of the deuterium discharge #94875, and to investigate the predicted relevance of ETG turbulence. The QuaLiKiz quasilinear gyrokinetic turbulent transport model [4,5,43] is electrostatic (ES), and limited to ŝ − α shifted circle geometry. EM stabilization of ITG turbulence is taken into account through an ad hoc model developed in reference [30], whereby the QuaLiKiz R/L Ti input is locally reduced by the ratio of thermal to total (including suprathermal) pressure, P th P supra +P th .…”

Section: Results From Integrated Modellingmentioning

confidence: 99%

Integrated modelling and multiscale gyrokinetic validation study of ETG turbulence in a JET hybrid H-mode scenario

Citrin¹,

Maeyama²,

Angioni³

et al. 2022

Nucl. Fusion

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Previous studies with first-principle-based integrated modelling suggested that ETG turbulence may lead to an anti-GyroBohm isotope scaling in JET high-performance hybrid H-mode scenarios. A dedicated comparison study against higher-fidelity turbulence modelling invalidates this claim. Ion-scale turbulence with magnetic field perturbations included, can match the power balance fluxes within temperature gradient error margins. Multiscale gyrokinetic simulations from two distinct codes produce no significant ETG heat flux, demonstrating that simple rules-of-thumb are insufficient criteria for its onset.

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Section: Results From Integrated Modellingmentioning

confidence: 99%

Integrated modelling and multiscale gyrokinetic validation study of ETG turbulence in a JET hybrid H-mode scenario

Citrin¹,

Maeyama²,

Angioni³

et al. 2022

Nucl. Fusion

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“…The single null, positive triangularity DTT full power reference scenario simulations [7] have been used as basis for this study. As in those simulations, the anomalous transport coefficients are calculated by QuaLiKiz (QLK) [29,30], a reduced gyrokinetic quasi-linear transport model, which is integrated in JETTO. Additional Bohm transport (3%) has been added for numerical stability reasons and in order to compensate the low electron heat transport foreseen in the central region (ρ t < 0.2) by QLK [31].…”

Section: Multi-channel Integrated Modelling Setup For Dtt Full Power ...mentioning

confidence: 99%

Core transport modelling of the DTT full power scenario using different fuelling strategies

Baiocchi,

Aucone,

Casiraghi

et al. 2023

Nucl. Fusion

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A theory-based integrated modelling work of plasma response to deuterium fuelling in the new Divertor Tokamak Test facility (DTT) is performed, using the transport code JETTO with the quasi-linear anomalous transport model QuaLiKiz for the core region. The full power DTT scenario E1 is investigated. It is characterized by 28.8 MW of Electron Cyclotron Resonance Heating (ECRH), 10 MW of Neutral Beam Injection and 6 MW of Ion Cyclotron Resonance Heating to the plasma. Plasma density and temperature profile evolution is calculated using two different fuelling methods, gas puffing and pellet injection, and two different seeding gases, argon and neon. With gas puffing the neutral flux at the separatrix needed to sustain the desired pedestal density level exceeds the feasibility limits of the pumping system, regardless of the type of impurity introduced, thus making the use of pellets mandatory. The simulations performed with pellet injection as fuelling method predict that the pedestal density is well sustained with realistic parameters foreseen for the DTT pellet injector. Strong dependence of the core density on the EC power deposition profile is found. TEM dominance, low outward flux and strongly hollow density in the inner core region are foreseen with central peaked EC power deposition profile. ITG dominance, inward flux and robust density sustainment on the whole radial interval are predicted for spread EC power deposition, though with central density close to the EC limit and with peaked impurity densities. An intermediate deposition extension is found to sustain the whole density profile and to obtain flatter core densities, as previously predicted for the reference full power DTT scenario by fixed pedestal simulations. The EC deposition is negligibly modified by refraction changes both during a single pellet cycle and after several pellet cycles, indicating full compatibility between the EC system and the pellet injection system.

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“…Taking the ratio of the flux components as opposed to the potentials bypasses any complications arising from differences in definitions between the two saturation rules. Looking at TGLF SAT2, one finds (30) which is the function incorporated into SAT3. Here WL s,k y ,k x is the quasilinear weight defined by TGLF, which is evaluated at a single k x rather than a sum over k x .…”

Section: Model Extensions 551 E × B Shearmentioning

confidence: 99%

“…A standard and relatively simple estimation of these potential magnitudes comes from the mixing length rule [29], which models the turbulent transport as a diffusive process, with a step size of a characteristic wavenumber of the linear instability and a time step of the inverse of the growth rate. This estimation is employed in QuaLiKiz [30], however saturation rules can be based on other turbulence saturation mechanisms, such as TGLF SAT1 [31] and SAT2's [1] paradigm of zonal mixing. Quasilinear models have been extensively validated against nonlinear gyrokinetic codes for deuterium plasmas [1,32] and have successfully modelled deuterium plasma discharges [11,[33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

A new quasilinear saturation rule for tokamak turbulence with application to the isotope scaling of transport

et al. 2022

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A new quasilinear saturation model SAT3 has been developed for the purpose of calculating radial turbulent fluxes in the core of tokamak plasmas. The new model is shown to be able to better recreate the isotope mass dependence of nonlinear gyrokinetic fluxes compared to contemporary quasilinear models, including SAT2 [1], whilst performing at least as well in other key equilibrium parameters. By first quantifying the isotope scaling of gyrokinetic flux spectra, it is shown that the deviation from the gyroBohm scaling of fluxes originates primarily in the magnitude of the saturated potentials. Using this result SAT3 was formulated using observations made from gyrokinetic data, including a novel and robust relation between the 1D potential spectrum and the radial spectral widths. This serves to define the underlying functional forms of SAT3 before then connecting to the linear dynamics, including a difference in saturation level between ITG- and TEM-dominated turbulence, with the resulting free parameters having been fit to a database of high-resolution nonlinear CGYRO simulations. Additional features outside of the database are included, including E × B shear and multi-ion plasma capability. The methodology used in the development of SAT3 represents an algorithm which can be used in the improvement and generation of future saturation models.

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Quasilinear gyrokinetic theory: a derivation of QuaLiKiz

Cited by 12 publications

References 68 publications

Integrated modelling and multiscale gyrokinetic validation study of ETG turbulence in a JET hybrid H-mode scenario

Integrated modelling and multiscale gyrokinetic validation study of ETG turbulence in a JET hybrid H-mode scenario

Core transport modelling of the DTT full power scenario using different fuelling strategies

A new quasilinear saturation rule for tokamak turbulence with application to the isotope scaling of transport

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