Understanding the dependence of the H-mode power threshold, PLH on the main ion composition is crucial for H-mode operation in ITER. In this work, H-mode power threshold studies conducted at ASDEX Upgrade are presented. These were performed in hydrogen plasmas with helium doping and in mixed hydrogen-deuterium plasmas. PLH stays constant on the level of pure hydrogen in hydrogen plasmas with helium doping up to cHe = 20%. Power balance calculations with the transport code ASTRA show that the edge ion heat flux at the L-H transition is independent of helium concentration and applied auxiliary heating, supporting that a critical edge ion heat flux is needed to enter H-mode. A non-linear dependence of PLH on the relative hydrogen content is found. PLH and the edge ion heat flux are constant at the level of pure deuterium for between 0 and 0.5 and constant on the level of pure hydrogen for between 0.8 and 1.

Plank, U., Putterich, T., Angioni, C., Cavedon, M., Conway, G., Fischer, R., et al. (2020). H-mode power threshold studies in mixed ion species plasmas at ASDEX Upgrade. NUCLEAR FUSION, 60(7) [10.1088/1741-4326/ab8e11].

H-mode power threshold studies in mixed ion species plasmas at ASDEX Upgrade

Cavedon M.;
2020

Abstract

Understanding the dependence of the H-mode power threshold, PLH on the main ion composition is crucial for H-mode operation in ITER. In this work, H-mode power threshold studies conducted at ASDEX Upgrade are presented. These were performed in hydrogen plasmas with helium doping and in mixed hydrogen-deuterium plasmas. PLH stays constant on the level of pure hydrogen in hydrogen plasmas with helium doping up to cHe = 20%. Power balance calculations with the transport code ASTRA show that the edge ion heat flux at the L-H transition is independent of helium concentration and applied auxiliary heating, supporting that a critical edge ion heat flux is needed to enter H-mode. A non-linear dependence of PLH on the relative hydrogen content is found. PLH and the edge ion heat flux are constant at the level of pure deuterium for between 0 and 0.5 and constant on the level of pure hydrogen for between 0.8 and 1.
Articolo in rivista - Articolo scientifico
edge ion heat flux; isotope mix; ITER operation; L-H transition;
English
Plank, U., Putterich, T., Angioni, C., Cavedon, M., Conway, G., Fischer, R., et al. (2020). H-mode power threshold studies in mixed ion species plasmas at ASDEX Upgrade. NUCLEAR FUSION, 60(7) [10.1088/1741-4326/ab8e11].
Plank, U; Putterich, T; Angioni, C; Cavedon, M; Conway, G; Fischer, R; Happel, T; Kappatou, A; Mcdermott, R; Schneider, P; Tardini, G; Weiland, M
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/354872
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