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Power exhaust by core radiation at COMPASS tokamak

SYSNO ASEP	0542717
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Power exhaust by core radiation at COMPASS tokamak
Author(s)	Komm, Michael (UFP-V)_{RID, ORCID} Mancini, D. (IT) Morbey, M. (NL) Cavalier, Jordan (UFP-V)_{RID, ORCID} Adámek, Jiří (UFP-V)_{RID, ORCID} Bernert, M. (DE) Bílková, Petra (UFP-V)_RID Böhm, Petr (UFP-V)_RID Brida, D. (DE) Février, C. (FR) Henderson, S. (GB) Hron, Martin (UFP-V)_{RID, ORCID} Jeřáb, Martin (UFP-V)_ORCID Imríšek, Martin (UFP-V)_RID Kripner, Lukáš (UFP-V)_ORCID Naydenkova, Diana (UFP-V)_{RID, ORCID} Pánek, Radomír (UFP-V)_RID Šos, Miroslav (UFP-V)_ORCID Vondráček, Petr (UFP-V)_{RID, ORCID}
Number of authors	19
Article number	036016
Source Title	Nuclear Fusion. - : Institute of Physics Publishing - ISSN 0029-5515 Roč. 61, č. 3 (2021)
Number of pages	11 s.
Language	eng - English
Country	AT - Austria
Keywords	Argon ; Detachment ; Impurity seeding ; Neon ; Nuclear fusion ; Plasma ; Tokamak
Subject RIV	BL - Plasma and Gas Discharge Physics
OECD category	Fluids and plasma physics (including surface physics)
R&D Projects	LM2018117 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
	EF16_013/0001551 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
Method of publishing	Limited access
Institutional support	UFP-V - RVO:61389021
UT WOS	000617157000001
EID SCOPUS	85101461070
DOI	10.1088/1741-4326/abd3ea
Annotation	Substantial power dissipation in the edge plasma is required for the safe operation of ITER and next-step fusion reactors, otherwise unmitigated heat fluxes at the divertor plasma-facing components (PFCs) would easily exceed their material limits. Traditionally, such heat flux mitigation is linked to the regime of detachment, which is characterised by a significant pressure gradient between upstream and downstream scrape-off layer (SOL). However, the physics phenomena responsible for power dissipation and pressure loss are distinctly different, especially when the power dissipation is achieved by impurity seeding. In principle, it is possible to achieve substantial mitigation of the heat fluxes while maintaining conservation of the pressure along the open field lines in the SOL. This regime can be accessed by injection of medium-or high-Z impurities, which mostly radiate inside the last closed flux surface. The critical question related to such an approach is the effect on confinement and perspective fusion power generation in future thermonuclear reactors. In this work, we report on experiments at COMPASS tokamak, where neon and argon impurities were injected in ohmic or NBI-heated low confinement plasmas. With appropriate seeding waveform, stable scenarios were achieved, avoiding the radiative collapse of plasmas. Significant reduction of heat fluxes at the outer target was observed, with heat flux pattern similar to the one previously achieved by nitrogen seeding. The reduction of downstream pressure was, however, accompanied by an equal reduction of upstream pressure, indicating that the power dissipation occurred inside the separatrix. Indeed, the impurity cooling is causing a significant drop of edge temperature, however, the effect in the plasma centre is much less pronounced.
Workplace	Institute of Plasma Physics
Contact	Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975
Year of Publishing	2022
Electronic address	https://iopscience.iop.org/article/10.1088/1741-4326/abd3ea

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