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

Plank, U.; Puetterich, T.; Angioni, C.; Cavedon, M.; Conway, G. D.; Fischer, R.; Happel, T.; Kappatou, A.; McDermott, R. M.; Schneider, P. A.; Tardini, G. und Weiland, M. (2020): H-mode power threshold studies in mixed ion species plasmas at ASDEX Upgrade. In: Nuclear Fusion, Bd. 60, Nr. 7, 074001

Abstract

Understanding the dependence of the H-mode power threshold,PLH,<ion 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.PLHcHe=20%<i. 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 ofPLHPLHnH/(nH+nD)nH/(nH+nD)<ibetween 0.8 and 1.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 0029-5515
• Sprache: Englisch