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  • Time-dependent boundary conditions during type I ELM in ITER scrape-off-layer [Elektronski vir]
    Vasileska, Ivona ; Tskhakaya, David ; Kos, Leon, 1966-
    Most of the plasma edge studies are focused on the problem of the transition between a hot plasma and a material surface in tokamaks. The impurities from divertor surfaces, migrate towards the bulk ... plasma and can causes deviation of the parallel transport from the classical one in time. However, the transient heat loads such as ELMs (Edge-Localized modes) occur in tokamak edge during H-mode confinement and lead to a significant loss of stored plasma energy. Once the ELM-driven plasma pulse has crossed the magnetic separatrix, it travels mainly parallel to the magnetic field lines and ends up hitting the divertor plate. To keep in limits of the erosion effects, caused by the high-energy neutrals and charged particles, it is important to formulate the boundary conditions (BCs). The BCs and limiting expressions for parallel heat flux and viscosity, and their time dependencies are important tasks for plasma edge tokamaks studies. Based on the previous article in NENE 2018, where time-dependent BCs were obtained for free-ELM, the aim of this work is to derive time-dependent BCs of Type I ELM state in ITER tokamak. The burning conditions of the generated plasma, that correspond to ITER are Q = 10, 15 MA baseline at q [sub] 95 = 3, for which the poloidal length of the 1D SOL is 20 m from inner to outer target. Typical upstream separatrix parameters of ne ~ 3 - 5 [interpunkt] 10 [sup] 19 m [sup] -3, Te ~ 100 - 150 eV and Ti ~ 200 - 300 eV are assumed. Inclined magnetic fields at the targets of (~ 5°) are included, as are the particle collisions, with a total of 3:4 [interpunkt] 10 [sup] 5 poloidal grid cells giving shortening factors of 20. Secondary electron emission at the tungsten targets is neglected. The kinetic simulations are done under under high performance conditions using the 1D3V electrostatic parallel Particle-in-Cell (PIC) code BIT1. A typical simulation requires up to 120 days running massively parallel 1152-2304 cores of the EU Marconi super-computer. The duration of the ELM pulse is taken to be between 100-200 [mikro] s. In a later stage of the work, these will be used as boundary conditions for calculations of ELM target heat loads using the SOLPS-ITER code.
    Vrsta gradiva - prispevek na konferenci
    Leto - 2019
    Jezik - angleški
    COBISS.SI-ID - 17036059