Pellet refuelling of particle loss due to ELM mitigation with RMPs in the ASDEX Upgrade tokamak at low collisionality

Valovič, M.; Lang, P. T.; Kirk, A.; Suttrop, W.; Cavedon, M.; Cseh, G.; Dunne, M.; Fischer, L.R.; Garzotti, L.; Guimarãis, L.; Kocsis, G.; Mlynek, A.; Plöckl, B.; Scannell, R.; Szepesi, T.; Tardini, G.; Thornton, A.; Viezzer, E.; Wolfrum, E.

doi:10.1088/0029-5515/56/6/066009

Cited by 15 publications

(31 citation statements)

References 32 publications

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“…The front coefficient in eq. (1) is very close to the value of 0.073 found in our previous pellet fuelling experiments in pure deuterium plasmas [17,18]. This indicates similarity of pellet particle loss mechanism, namely the dominant role of ELMs.…”

Section: Pellet Particle Fluxsupporting

confidence: 86%

Control of the hydrogen:deuterium isotope mixture using pellets in JET

et al. 2019

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Deuterium pellets are injected into initially pure hydrogen H-mode plasma in order to control H:D isotope mixture. The pellets are deposited in outer 20% of minor radius, similar to that expected in ITER creating transiently hollow electron density profiles. The isotope mixture of H:D ~ 45:55% is obtained in the core with pellet fuelling throughput of Φ = 0.045 , ⁄ similar to previous pellet fuelling experiments in pure deuterium. Evolution of H:D mix in the core is reproduced using simple model although deuterium transport could be higher at the beginning of the pellet train compared to the flat top phase.

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Section: Pellet Particle Fluxsupporting

confidence: 86%

Control of the hydrogen:deuterium isotope mixture using pellets in JET

et al. 2019

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“…The front coefficient in equation ( 1) 𝛼 = 0.040 represents a ratio of particle to heat flux and its value depends on detailed transport physics of particle losses. In our previous pellet fuelling experiments with RMPs 𝛼 = 0.05 − 0.07 [13,14], but in these plasmas only ELM mitigation was observed and the particle loss was dominated by ELMs. This ELM mechanism is missing in our present case with full ELM suppression and it is replaced by a new continuous post pellet particle loss.…”

Section: Pellet Fuelling Throughputmentioning

confidence: 72%

Compatibility of pellet fuelling with ELM suppression by RMPs in the ASDEX Upgrade tokamak

et al. 2020

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It is demonstrated that tokamak plasma can be fuelled by pellets while simultaneously maintaining ELM suppression by external resonant magnetic perturbations (RMPs). Pellets are injected verically from high field site and deposited at outer part of plasma cross section. Each pellet triggers a benign MHD event followed by a short lived ELM-free phase. The ELM suppression phase with pellet fuelling lasts 11 pellet cycles and is terminated by intentionally increasing the pellet rate to cause a transition to the ELMy phase.

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“…Also the ELM losses increase somewhat. Stability analysis for these shots which are of the type of 31128 (low triangularity) shows that the edge is at the peeling-ballooning limit without MP and well stable with MP on both without and with pellet injection [92]. Since there are obviously in all cases individual discernible ELM crash events, one can conjecture that the MP modifies the edge stability limit, which however is below the ideal peeling-ballooning limit of the unperturbed axisymmetric plasma.…”

Section: Prospects For Reducing the Divertor Load Due To Elmsmentioning

confidence: 94%

“…4) which is connected to a confinement reduction compared to the case without MP. Deuterium pellets have been injected [92] to refuel the plasma. While the original plasma density can be restored, the pedestal pressure remains below that without MP due to a reduction of pedestal temperature.…”

Section: Prospects For Reducing the Divertor Load Due To Elmsmentioning

confidence: 99%