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  • 1
    Electronic Resource
    Electronic Resource
    Terawatt fiber pinch experiments (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 7261-7272 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pinch formation in fiber pinch experiments has been investigated in the lower terawatt regime. The main results are: (1) there are upper limits of breakdown voltage (∼700 kV) and current rise rate (∼20 kA/ns) beyond which leak discharges develop within the vacuum feed of the pulseline KALIF; (2) there is a lower limit of fiber radius (∼10 μm) below which pinch disruptions take place at a pinch current of (approximately-greater-than)300 kA; (3) the hot (Te≤1 keV) inhomogeneous pinch plasma develops typically 10 ns after local collapses (micropinches) at a pinch current (approximately-greater-than)400 kA and lives for more than 50 ns; (4) neutron emission (yield of CD2 fibers ∼1010) appears mostly isotropic; (5) all fiber pinches show global expansion with velocities reaching from typically 10 μm/ns (initial expansion) to (approximately-greater-than)100 μm/ns; and (6) the power requirements for the fiber ablation process are contradictory to those for the final pinch phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349773
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Observations of soft x-ray production in the speed 2 plasma focus (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 613-617 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new soft x-ray source has been developed and investigated. Argon is injected into a plasma focus through a hole in the anode. The pinch emits several Joules per shot of soft x rays at λ〈0.5 nm from multiple micropinches well aligned along the axis of symmetry. When viewed end-on the pinch appears as a small source of 700 μm diam. The micropinches have the following characteristics: Range of size 40–250 μm (depending on radiation wavelength), density 1028 m−3, temperature 1.5 keV, and lifetime typically less than 1 ns. The helium-like emission from single micropinches lasts for 250 ps only, which is much shorter than previously reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347394
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Trace and surface analysis of ceramic layers of solid oxide fuel cells by mass spectrometry (1996)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 355 (1996), S. 626-632 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract For the trace analysis of impurities in thick ceramic layers of a solid oxide fuel cell (SOFC) sensitive solid-state mass spectrometric methods, such as laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) and radiofrequency glow discharge mass spectrometry (rf-GDMS) have been developed and used. In order to quantify the analytical results of LA-ICP-MS, the relative sensitivity coefficients of elements in a La0.6Sr0.35MnO3 matrix have been determined using synthetic standards. Secondary ion mass spectrometry (SIMS) – as a surface analytical method – has been used to characterize the element distribution and diffusion profiles of matrix elements on the interface of a perovskite/Y-stabilized ZrO2 layer. The application of different mass spectrometric methods for process control in the preparation of ceramic layers for the SOFC is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s0021663550626
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    Paper (German National Licenses)
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