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  • Fusion  (1)
  • Physics (General)  (1)
  • Plasma Physics  (1)
  • environment  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Journal of fusion energy 16 (1997), S. 245-251 
    ISSN: 1572-9591
    Schlagwort(e): Fusion ; safety ; environment ; accidents ; waste
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract The SEAFP (Safety and Environmental Assessment of Fusion Power) and SEAL (Safety and Environmental Assessment of fusion power, Long-term) programs form part of the ongoing effort in the European Fusion Programme to consider the safety and environmental aspects of fusion power. SEAFP was undertaken in the period 1992–1994. The assessment started with the development of two conceptual power plant designs, each of 3000 MW of fusion power, termed Model 1 and Model 2. Model 1 used vanadium alloy, helium cooling, and lithium oxide for tritium generation. Model 2 used a reduced-activation martensitic steel, water cooling, and a lithium–lead alloy for tritium generation. Both Models were designed for passive safety. The SEAFP analyses included detailed consideration of effluents, occupational doses, accidents (concentrating on the worst possible accidents), and waste management. The key results are summarized in this paper. SEAL was launched in 1995, with the aims of broadening the scope of SEAFP, and of elaborating selected aspects of SEAFP in more detail. The SEAL analyses include studies which extend the results of SEAFP to a wider class of blanket designs and material choices, improved assessments of the quantities of activated materials which may be exempted from regulatory control or recycled, improved modeling of occupational doses, and work in many areas to improve relevant data, modeling and analyses, or consider design improvements. Much of this work is ongoing, but key results from completed work are summarized in this paper.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 2019-07-13
    Beschreibung: The occurrence of geomagnetically induced currents (GICs) poses serious threats to modern technological infrastructure. Large GICs result from sharp variations of the geomagnetic field (dBdt) caused by changes of large-scale magnetospheric and ionospheric currents. Intense dBdt perturbations are known to occur often in high-latitude regions as a result of storm time substorms. Magnetospheric compressions usually caused by interplanetary shocks increase the magnetopause current leading to dBdt perturbations more evident in midlatitude to low-latitude regions, while they increase the equatorial electrojet current leading to dBdt perturbations in dayside equatorial regions. We investigate the effects of shock impact angles and speeds on the subsequent dBdt perturbations with a database of 547 shocks observed at the L1 point. By adopting the threshold of dBdt = 100 nT/min, identified as a risk factor to power systems, we find that dBdt generally surpasses this threshold when following impacts of high-speed and nearly frontal shocks in dayside high-latitude locations. The same trend occurs at lower latitudes and for all nightside events but with fewer high-risk events. Particularly, we found nine events in equatorial locations with dBdt 〉 100 nT/min. All events were caused by high-speed and nearly frontal shock impacts and were observed by stations located around noon local time. These high-risk perturbations were caused by sudden strong and symmetric magnetospheric compressions, more effectively intensifying the equatorial electrojet current, leading to sharp dBdt perturbations. We suggest that these results may provide insights for GIC forecasting aiming at preventing degradation of power systems due to GICs.
    Schlagwort(e): Physics (General)
    Materialart: GSFC-E-DAA-TN58369 , Space Weather (ISSN 1539-4956) (e-ISSN 1542-7390); 16; 6; 636-647
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Publikationsdatum: 2019-07-13
    Beschreibung: We compare predicted magnetopause positions at the subsolar point and four reference points in the terminator plane obtained from several empirical and numerical MHD (magnetohydrodynamics) models. Empirical models using various sets of magnetopause crossings and making different assumptions about the magnetopause shape predict significantly different magnetopause positions (with a scatter greater than 1 Earth radius (R (sub E)) even at the subsolar point. Axisymmetric magnetopause models cannot reproduce the cusp indentations or the changes related to the dipole tilt effect, and most of them predict the magnetopause closer to the Earth than non axisymmetric models for typical solar wind conditions and zero tilt angle. Predictions of two global non axisymmetric models do not match each other, and the models need additional verification. MHD models often predict the magnetopause closer to the Earth than the non axisymmetric empirical models, but the predictions of MHD simulations may need corrections for the ring current effect and decreases of the solar wind pressure that occur in the foreshock. Comparing MHD models in which the ring current magnetic field is taken into account with the empirical Lin et al. model, we find that the differences in the reference point positions predicted by these models are relatively small for B (sub z) equals 0 (note: B (sub z) is when the Earth's magnetic field points north versus Sun's magnetic field pointing south). Therefore, we assume that these predictions indicate the actual magnetopause position, but future investigations are still needed.
    Schlagwort(e): Plasma Physics
    Materialart: GSFC-E-DAA-TN41094 , Journal of Geophysical Research: Space Physics (ISSN 2169-9380) (e-ISSN 2169-9402); 121; 7; 6493-6508
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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