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Simulations of COMPASS vertical displacement events with a self-consistent model for halo currents including neutrals and sheath boundary conditions [Elektronski vir]Artola, Francisco Javier ...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–Härm 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 ($J_{\textrm{sat}}$) 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 $J_{\textrm{sat}}$ profile, increasing the halo width at a similar total halo current.Vir: Plasma physics and controlled fusion [Elektronski vir]. - ISSN 1361-6587 (Vol. 63, no. 6, 2021, str. 1-19)Vrsta gradiva - e-članekLeto - 2021Jezik - angleškiCOBISS.SI-ID - 93326083
Avtor
Artola, Francisco Javier |
Loarte, A. |
Matveeva, E. |
Havliček, J., fizik |
Markovic, T. |
Adámek, Jiří, fizik, 1976- |
Cavalier, Jordan |
Kripner, L. |
Huijsmans, G. T. A. |
Lehnen, M. |
Hoelzl, Matthias |
Panek, Radomir |
Kos, Leon, 1966-
Teme
plasma physics |
COMPASS tokamak |
fizika plazme |
VDE simulations
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Leto | Faktor vpliva | Izdaja | Kategorija | Razvrstitev | ||||
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
Baze podatkov, v katerih je revija indeksirana
Ime baze podatkov | Področje | Leto |
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Povezave do osebnih bibliografij avtorjev | Povezave do podatkov o raziskovalcih v sistemu SICRIS |
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Artola, Francisco Javier | ![]() |
Loarte, A. | ![]() |
Matveeva, E. | ![]() |
Havliček, J., fizik | ![]() |
Markovic, T. | ![]() |
Adámek, Jiří, fizik, 1976- | ![]() |
Cavalier, Jordan | ![]() |
Kripner, L. | ![]() |
Huijsmans, G. T. A. | ![]() |
Lehnen, M. | ![]() |
Hoelzl, Matthias | ![]() |
Panek, Radomir | ![]() |
Kos, Leon, 1966- | 12725 |
Vir: Osebne bibliografije
in: SICRIS
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