Impurity outward particle flux from externally applied torque

Fable, E; Angioni, C; ,

doi:10.1088/1361-6587/ad01dd

Cited by 4 publications

(1 citation statement)

References 40 publications

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“…Finally, note that the CXRS profile at low current is hollow, but the modelling predicts no hollow profiles. The lack of predicted light impurity hollowness is a well documented missing piece of theoretical understanding [76][77][78][79], although two physical mechanisms have been recently proposed to explain it [80,81].…”

Section: Discussionmentioning

confidence: 99%

Full-radius integrated modelling of ASDEX Upgrade L-modes including impurity transport and radiation

Fajardo,

Angioni,

Dux

et al. 2024

Nucl. Fusion

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An integrated framework that demonstrates multi-species, multi-channel modelling capabilities for the prediction of impurity density profiles and their feedback on the main plasma through radiative cooling and fuel dilution is presented. It combines all presently known theoretical elements in the local description of quasilinear turbulent and neoclassical impurity transport, using the models TGLF-SAT2 and FACIT. These are coupled to the STRAHL code for impurity sources and radiation inside the ASTRA transport solver. The workflow is shown to reproduce experimental results in full-radius L-mode modelling. In particular, a set of ASDEX Upgrade L-modes with differing heating power mixtures and plasma currents are simulated, including boron (B) and tungsten (W) as intrinsic impurities. The increase of predicted confinement with higher current and the reduction of core W peaking with higher central wave heating are demonstrated. Furthermore, a highly radiative L-mode scenario featuring an X-point radiator (XPR) with two intrinsic (B, W) and one seeded argon (Ar) species is simulated, and its measured radiated power and high confinement are recovered by the modelling. The stabilizing effect of impurities on turbulence is analyzed and a simple model for the peripheral X-point radiation is introduced. A preliminary full-radius simulation of an H-mode phase of this same discharge, leveraging recent work on the role of the E×B shearing at the edge, shows promising results.

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Section: Discussionmentioning

confidence: 99%

Full-radius integrated modelling of ASDEX Upgrade L-modes including impurity transport and radiation

Fajardo,

Angioni,

Dux

et al. 2024

Nucl. Fusion

Self Cite

View full text Add to dashboard Cite

show abstract

SOLPS-ITER modification for impurity transport modelling in the tokamak pedestal region

Korzueva,

Kaveeva,

Rozhansky

et al. 2025

Nuclear Materials and Energy

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Integrated modelling of tungsten accumulation control with wave heating: validation in ASDEX Upgrade and predictions for ITER

Fajardo,

Angioni,

Fable

et al. 2024

Nucl. Fusion

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In present-day fusion devices, central wave heating is crucial to avoid core tungsten (W) accumulation. In this work, we present an integrated modelling framework that reproduces the reduction of core W peaking in ASDEX Upgrade experiments when multiple transport channels are self-consistently evolved, emphasizing the effects of wave heating on turbulent and neoclassical W transport. Predictions for the ITER 15 MA baseline are then provided. We show that the core of a reactor is in a different transport regime for W as compared to present-day tokamaks. The challenges introduced by W arise from global radiation losses that can hinder operation in H-mode, instead of local central accumulation.

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Impurity outward particle flux from externally applied torque

Cited by 4 publications

References 40 publications

Full-radius integrated modelling of ASDEX Upgrade L-modes including impurity transport and radiation

Full-radius integrated modelling of ASDEX Upgrade L-modes including impurity transport and radiation

SOLPS-ITER modification for impurity transport modelling in the tokamak pedestal region

Integrated modelling of tungsten accumulation control with wave heating: validation in ASDEX Upgrade and predictions for ITER

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