Analytic formulae for centrifugal effects on turbulent transport of trace impurities in tokamak plasmas

Angioni, C.; Casson, F. J.; Veth, C.; Peeters, A. G.

doi:10.1063/1.4773051

Cited by 37 publications

(57 citation statements)

References 20 publications

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“…In JETTO-SANCO 1 s of JET plasma simulation with QuaLikiz costs ∼ 10 hours walltime using 10 CPUs. All simulations covered both ion and electron scales with a wavenumber spectrum of k θ ρ s = [0.1, 0.175, 0.25, 0.325, 0.4, 0.5, 0.7, 1, 1.8, 3,9,15,21,27,36,45].…”

Section: Validation With Integrated Modelling Of Jet Dischargesmentioning

confidence: 99%

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

Citrin

Bourdelle

Casson

et al. 2017

Plasma Phys. Control. Fusion

139

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Quasilinear turbulent transport models are a successful tool for prediction of core tokamak plasma profiles in many regimes. Their success hinges on the reproduction of local nonlinear gyrokinetic fluxes. We focus on significant progress in the quasilinear gyrokinetic transport model QuaLiKiz [C. Bourdelle et al. 2016 Plasma Phys. Control. Fusion 58 014036], which employs an approximated solution of the mode structures to significantly speed up computation time compared to full linear gyrokinetic solvers. Optimization of the dispersion relation solution algorithm within integrated modelling applications leads to flux calculations ×10 6−7 faster than local nonlinear simulations. This allows tractable simulation of flux-driven dynamic profile evolution including all transport channels: ion and electron heat, main particles, impurities, and momentum. Furthermore, QuaLiKiz now includes the impact of rotation and temperature anisotropy induced poloidal asymmetry on heavy impurity transport, important for W-transport applications. Application within the JETTO arXiv:1708.01224v2 [physics.plasm-ph] 7 Aug 2017Tractable flux-driven temperature, density, and rotation profile evolution with the quasilinear gyrokinetic tran integrated modelling code results in 1 s of JET plasma simulation within 10 hours using 10 CPUs. Simultaneous predictions of core density, temperature, and toroidal rotation profiles for both JET hybrid and baseline experiments are presented, covering both ion and electron turbulence scales. The simulations are successfully compared to measured profiles, with agreement mostly in the 5-25% range according to standard figures of merit. QuaLiKiz is now open source and available at www.qualikiz.com.Tractable flux-driven temperature, density, and rotation profile evolution with the quasilinear gyrokinetic tran

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Section: Validation With Integrated Modelling Of Jet Dischargesmentioning

confidence: 99%

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

Citrin

Bourdelle

Casson

et al. 2017

Plasma Phys. Control. Fusion

139

View full text Add to dashboard Cite

show abstract

“…In contrast to neoclassical transport, turbulent impurity transport does not exhibit convective mechanisms which increase with increasing charge or mass of the heavy impurity. [18][19][20] However, it is not strongly modified by poloidal asymmetries, 21,22 therefore in the presence of strong rotation, it can become relatively small as compared to the neoclassical transport component over a large radial window at the plasma center. 4 In a previous work, 4 we have focused on the W behaviour in hybrid scenarios in the presence of neutral beam injection (NBI) heating only.…”

Section: Introductionmentioning

confidence: 98%

The impact of poloidal asymmetries on tungsten transport in the core of JET H-mode plasmas

et al. 2015

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Recent progress in the understanding and prediction of the tungsten behaviour in the core of JET H-mode plasmas with ITER-like wall is presented. Particular emphasis is given to the impact of poloidal asymmetries of the impurity density. In particular, it is shown that the predicted reduction of temperature screening induced by the presence of low field side localization of the tungsten density produced by the centrifugal force is consistent with the observed tungsten behaviour in a JET discharge in H-mode baseline scenario. This provides first evidence of the role of poloidal asymmetries in reducing the strength of temperature screening. The main differences between plasma parameters in JET baseline and hybrid scenario discharges which affect the impact of poloidally asymmetric density on the tungsten radial transport are identified. This allows the conditions by which tungsten accumulation can be avoided to be more precisely defined.

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“…In the published literatures of turbulent impurity transport, the most used simplification is trace (tested, passive) impurity approximation [13][14][15][16][30][31][32] or dilution model 11 especially for heavy metal impurities. 35 But, impurities can have nonnegligible influence on turbulence.…”

Section: Introductionmentioning

confidence: 99%

“…The anomalous transport is attributed to the presence of drift wave-type turbulence. For turbulent impurity transport, the theoretical and simulation works [10][11][12][13][14][15][16][17][18][19][20][21] all hitherto existing mainly focused on ion temperature gradient mode (ITG) and trapped electron mode (TEM) turbulence.…”

Section: Introductionmentioning

confidence: 99%

Isotopic dependence of impurity transport driven by ion temperature gradient turbulence

2016

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Hydrogenic ion mass effects, namely the isotopic effects on impurity transport driven by ion temperature gradient (ITG) turbulence are investigated using gyrokinetic theory.For non-trace impurities, changing from hydrogen (H) to deuterium (D), and to tritium (T) plasmas, the outward flux for lower (higher) ionized impurities or for lighter (heavier) impurities is found to decrease (increase), although isotopic dependence of ITG linear growth rate is weak. This is mainly due to the decrease of outward (inward) convection, while the isotopic dependence of diffusion is relatively weak. In addition, the isotopic effects reduce (enhance) the impurity flux of fully ionized carbon (C 6+ ) for weaker (stronger) magnetic shear. In trace impurity limit, the isotopic effects are found to reduce the accumulation of high-Z tungsten (W). Moreover, the isotopic effects on the peaking factor (PF) of trace high-Z W get stronger with stronger magnetic shear.

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Analytic formulae for centrifugal effects on turbulent transport of trace impurities in tokamak plasmas

Cited by 37 publications

References 20 publications

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

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

The impact of poloidal asymmetries on tungsten transport in the core of JET H-mode plasmas

Isotopic dependence of impurity transport driven by ion temperature gradient turbulence

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