Počet záznamů: 1
Simulations of COMPASS vertical displacement events with a self-consistent model for halo currents including neutrals and sheath boundary conditions
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SYSNO ASEP 0573308 Druh ASEP J - Článek v odborném periodiku Zařazení RIV Záznam nebyl označen do RIV Poddruh J Článek ve SCOPUS Název Simulations of COMPASS vertical displacement events with a self-consistent model for halo currents including neutrals and sheath boundary conditions Tvůrce(i) Artola, F. J. (FR)
Loarte, A. (FR)
Matveeva, Ekaterina (UFP-V)
Havlíček, Josef (UFP-V) RID, ORCID
Markovič, Tomáš (UFP-V) RID
Adámek, Jiří (UFP-V) RID, ORCID
Cavalier, Jordan (UFP-V) RID, ORCID
Kripner, Lukáš (UFP-V) ORCID
Huijsmans, G. T.A. (NL)
Lehnen, M. (FR)
Hoelzl, M. (DE)
Pánek, Radomír (UFP-V) RIDCelkový počet autorů 12 Číslo článku 064004 Zdroj.dok. Plasma Physics and Controlled Fusion. - : Institute of Physics Publishing - ISSN 0741-3335
Roč. 63, č. 6 (2021)Poč.str. 19 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova compass ; disruption ; jorek ; non-linear MHD ; vertical displacement event EID SCOPUS 85105949741 DOI 10.1088/1361-6587/abf620 Anotace The understanding of the halo current properties during disruptions is key to design and operate large scale tokamaks in view of the large thermal and electromagnetic loads that they entail. For the first time, we present a fully self-consistent model for halo current simulations including neutral particles and sheath boundary conditions. The model is used to simulate vertical displacement events (VDEs) occurring in the COMPASS tokamak. Recent COMPASS experiments have shown that the parallel halo current density at the plasma-wall interface is limited by the ion saturation current during VDE-induced disruptions. We show that usual magneto-hydrodynamic boundary conditions can lead to the violation of this physical limit and we implement this current density limitation through a boundary condition for the electrostatic potential. Sheath boundary conditions for the density, the heat flux, the parallel velocity and a realistic parameter choice (e.g. Spitzer's resistivity and Spitzer-Harm parallel thermal conductivity) extend present VDE simulations beyond the state of the art. Experimental measurements of the current density, temperature and heat flux profiles at the COMPASS divertor are compared with the results obtained from axisymmetric simulations. Since the ion saturation current density (Jsat) is shown to be essential to determine the halo current profile, parametric scans are performed to study its dependence on different quantities such as the plasma resistivity and the particle and heat diffusion coefficients. In this respect, the plasma resistivity in the halo region broadens significantly the Jsat profile, increasing the halo width at a similar total halo current. Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2024
Počet záznamů: 1