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Plasmoid drift and first wall heat deposition during ITER H-mode dual-SPIs in JOREK simulations by Hu, D.; Artola, F. J.; Nardon, E.; Lehnen, M.; Kong, M.; Bonfiglio, D.; Hoelzl, M.; Huijsmans, G. T. A.; Team, JOREK is a scholarly article available to read on EtoBox.

What is Plasmoid drift and first wall heat deposition during ITER H-mode dual-SPIs in JOREK simulations about?

The heat flux mitigation during the Thermal Quench (TQ) by the Shattered Pellet Injection (SPI) is one of the major elements of disruption mitigation strategy for ITER. It's efficiency greatly depends on the SPI and the target plasma, and is ultimately checked by the heat deposition on to the PFCs. To investigate this, JOREK simulations of neon-mixed dual-SPIs into ITER baseline H-mode and a "degraded H-mode" with and without good injector synchronization are performed with focus on the first wall heat flux and its energy impact. It is found that low neon fraction SPIs into the baseline H-mode plasmas exhibit strong major radial plasmoid drift as the fragments arrive at the pedestal, accompanied by edge stochasticity. Significant density expulsion and outgoing heat flux occurs as a result, reducing the mitigation efficiency. Such drift motion could be mitigated by injecting higher neon fraction pellets', or by considering the pre-disruption confinement degradation, thus improving the radiation fraction. The radiation heat flux is found to peak in the vicinity of the fragment injection location in the early injection phase, while it relaxes later on due to parallel impurity transpor

Author

Hu, D.; Artola, F. J.; Nardon, E.; Lehnen, M.; Kong, M.; Bonfiglio, D.; Hoelzl, M.; Huijsmans, G. T. A.; Team, JOREK

Published

2024

Language

EN