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Search: WFRF:(Paschalidis V.) > (2022)

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  • Orsini, S., et al. (author)
  • Inner southern magnetosphere observation of Mercury via SERENA ion sensors in BepiColombo mission
  • 2022
  • In: Nature Communications. - : Nature Publishing Group. - 2041-1723. ; 13:1
  • Journal article (peer-reviewed)abstract
    • Mercury’s southern inner magnetosphere is an unexplored region as it was not observed by earlier space missions. In October 2021, BepiColombo mission has passed through this region during its first Mercury flyby. Here, we describe the observations of SERENA ion sensors nearby and inside Mercury’s magnetosphere. An intermittent high-energy signal, possibly due to an interplanetary magnetic flux rope, has been observed downstream Mercury, together with low energy solar wind. Low energy ions, possibly due to satellite outgassing, were detected outside the magnetosphere. The dayside magnetopause and bow-shock crossing were much closer to the planet than expected, signature of a highly eroded magnetosphere. Different ion populations have been observed inside the magnetosphere, like low latitude boundary layer at magnetopause inbound and partial ring current at dawn close to the planet. These observations are important for understanding the weak magnetosphere behavior so close to the Sun, revealing details never reached before.
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2.
  • Ratynskaia, Svetlana V., et al. (author)
  • Experiments and modelling on ASDEX Upgrade and WEST in support of tool development for tokamak reactor armour melting assessments
  • 2022
  • In: Nuclear Materials and Energy. - : Elsevier BV. - 2352-1791. ; 33
  • Journal article (peer-reviewed)abstract
    • The risk of metallic armour melting constitutes a major concern for ITER and DEMO. Combined computational and experimental effort has led to a successful understanding of melt dynamics in present-day tokamaks, but there remain unexplored melting regimes of relevance to future reactors. Analysis of recent poor-versus -efficient thermionic emitter sample exposures in ASDEX-Upgrade and ITER-like actively cooled tungsten leading edge exposures in WEST is presented. The coupled thermal response and melt dynamics is modelled with the new MEMENTO code employing the MEMOS-U physics model which has no adjustable parameters. In the weak Lorentz force regime accessed in the exposures, very close agreement between modelling and experiments is achieved not only for the deformation profiles, but also for the additional, unique to these experiments, constraints; simultaneous thermal response of two different materials in ASDEX-Upgrade and in-situ detection of melt build-up in WEST.
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