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Search: WFRF:(Podolnik A.) > (2020)

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1.
  • Komm, M., et al. (author)
  • Space-charge limited thermionic sheaths in magnetized fusion plasmas
  • 2020
  • In: Nuclear Fusion. - : IOP Publishing. - 0029-5515 .- 1741-4326. ; 60:5
  • Journal article (peer-reviewed)abstract
    • A systematic particle-in-cell investigation is reported focusing on the sheaths surrounding hot planar surfaces that are embedded in fusion plasmas with an arbitrary magnetic field inclination angle. The transition to the space-charge limited regime and the subsequent strict limitation of the escaping thermionic current density are demonstrated to be global characteristics of strongly emitting sheaths also in the presence of inclined magnetic fields. A physically transparent semi-empirical expression has been identified for the limited thermionic current as a function of the plasma conditions and inclination angle that is accurate for both the inter-and intra-ELM plasmas of present-day tokamaks.
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2.
  • Tolias, Panagiotis, 1984-, et al. (author)
  • Origin and nature of the emissive sheath surrounding hot tungsten tokamak surfaces
  • 2020
  • In: Nuclear Materials and Energy. - : Elsevier BV. - 2352-1791. ; 25
  • Journal article (peer-reviewed)abstract
    • The accurate description of the emitted current that escapes from hot tungsten surfaces is essential for reliable predictions of the macroscopic deformation due to melt motion induced by fast transient events. A comprehensive analytical electron emission model is developed and its implementation in the particle-in-cell 2D3V code SPICE2 is discussed. The properties of emissive sheaths of present tokamaks, where thermionic emission is strongly suppressed by space-charge effects and by prompt re-deposition, are reviewed for arbitrary magnetic field inclination angles. The unique characteristics of emissive sheaths that emerge during ITER ELMs, where weakly impeded thermionic emission is coupled with field emission and competes with electron-induced emission, are revealed. The first ITER simulations are reported for normal inclinations.
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  • Result 1-2 of 2
Type of publication
journal article (2)
Type of content
peer-reviewed (2)
Author/Editor
Ratynskaia, Svetlana ... (2)
Tolias, Panagiotis, ... (2)
Komm, M. (2)
Podolnik, A. (2)
University
Royal Institute of Technology (2)
Language
English (2)
Research subject (UKÄ/SCB)
Natural sciences (2)
Year
2020 (2)Undo refine

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