Recent developments in support of the shattered pellet technique for disruption mitigation

Comprehensive upgrades to the dust transport code DTOKS that extend the plasma-dust interaction model are presented and compared with recent measurements of dust transport in DIII-D. Simulations incorporating variation in physical properties of graphite dust with temperature and size in a stationary plasma background suggest a substantial decrease in lifetimes due principally to thermal expansion. The trajectories of 53 dust grains identified from analysis of visible camera data taken across two similar shots were used to measure the dust particle velocity distributions. Dust tracks terminated mostly at the outer divertor strike point having a mean observation time of 2.1 ± 0.4ms. Stochastic modelling of 200 graphite dust particles in the DIII-D tokamak performed with DTOKS-U using plasma simulations generated by OEDGE found similar behaviour, with particles ablating rapidly after acquiring a positive charge in the region close to the outer strike point, creating an acute source of neutral carbon atoms. The simulated mean lifetime, 11±2ms, showed approximate agreement with experimental observation when corrected by accounting for dust visibility and ignoring the longest trajectories 1.5 ± 0.2ms. Synthetic diagnostic data generated from coupling the results of DTOKS-U with the visualisation software Calcam offers a powerful new tool for validation of simulations and predictive calculations of dust dynamics.

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Modelling dust transport in DIII-D with DTOKS-Upgrade

Simons

Cowley

Fuller

et al. 2021

Plasma Phys. Control. Fusion

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Pellet Injection Technology and Its Applications on ITER

Baylor

Combs

Duckworth

et al. 2016

IEEE Trans. Plasma Sci.

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Recent developments in support of the shattered pellet technique for disruption mitigation

Cited by 2 publications

References 14 publications

Modelling dust transport in DIII-D with DTOKS-Upgrade

Modelling dust transport in DIII-D with DTOKS-Upgrade

Pellet Injection Technology and Its Applications on ITER

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