Browsing by Author "Wagner, Jochen"

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    Enabling time-resolved 2D spatial-coherence measurements using the Fourier-analysis method with an integrated curved-grating beam monitor
    (Washington, DC : Soc., 2020) Bagschik, Kai; Schneider, Michael; Wagner, Jochen; Buss, Ralph; Riepp, Matthias; Philippi-Kobs, Andre; Müller, Leonard; Roseker, Wojciech; Trinter, Florian; Hoesch, Moritz; Viefhaus, Jens; Eisebitt, Stefan; Grübel, Gerhard; Oepen, Hans Peter; Frömter, Robert
    Direct 2D spatial-coherence measurements are increasingly gaining importance at synchrotron beamlines, especially due to present and future upgrades of synchrotron facilities to diffraction-limited storage rings. We present a method to determine the 2D spatial coherence of synchrotron radiation in a direct and particularly simple way by using the Fourier-analysis method in conjunction with curved gratings. Direct photon-beam monitoring provided by a curved grating circumvents the otherwise necessary separate determination of the illuminating intensity distribution required for the Fourier-analysis method. Hence, combining these two methods allows for time-resolved spatial-coherence measurements. As a consequence, spatial-coherence degradation effects caused by beamline optics vibrations, which is one of the key issues of state-of-the-art X-ray imaging and scattering beamlines, can be identified and analyzed. © 2020 Optical Society of America.
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    Ultrasonic roll seam welding for the production of glass/metal compounds
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1996) Eifler, Dietmer; Roeder, Erwin; Schlicker, Uwe; Wagner, Jochen
    The joining technology of glasses and glass-ceramics with metal is growing in importance in view of the increased application possibilities of such Compound parts in the machinery and electronics industries. A new method has recently gone into competition with the current production methods of these Compounds such as melting, soldering and glueing. This novel method is ultrasonic welding. So far this joining technology has only been applied in ultrasonic spot welding. However, it is n ow possible to manufacture Compounds with a shear strength of up to 50 MP a at low temperatures (< 400°C) in short periods of time (< 1.5 s). To extend the application of ultrasonic welding the Department of Materials Science at the University of Kaiserslautern (Germany) has constructed and put into Operation an ultrasonic roll seam welding machine for the continuous and intermittent joining of glass and glass-ceramics with metal. So far this device has, among other things, been used to join a borosilicate and a soda-lime-silica glass with several kinds of high alloyed steel, an aluminium alloy and the glass sealing alloy KOVAR (NiCo 29 17) with the addition of a thin intermediate layer of aluminium. By means of systematic studies of the parameters feed, welding force and amplitude, that significantly influence the welding process, an optimization of the Compound strength has been achieved.