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Insertion devices for BESSY II (1998)

Bahrdt, J. ; Gaupp, A. ; Ingold, G. ; [et al.]

Chester : International Union of Crystallography (IUCr)

Journal of synchrotron radiation 5 (1998), S. 443-444

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ISSN: 1600-5775

Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Topics: Geosciences , Physics

Notes: The high-brilliance synchrotron radiation source BESSY II will provide space for the installation of 14 insertion devices. At the time of writing (July 1997), eight insertion devices are funded. The first light for use by scientists will be available in January 1999. The undulators are designed for a scanning operation in parallel with the monochromator. This modus requires tight tolerances concerning the drive system. The first insertion device to be installed, a U-49 undulator, has been assembled and magnetically measured. The r.m.s. phase error is 2°. An endpole configuration using coils with less than 64 amp-turns makes the angular kick smaller than ±3 µrad over a gap range 15–50 mm.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1107/S0909049597013757

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Transport through cavities with tunnel barriers: a semiclassical analysis (1998)

Schreier, M. ; Richter, K. ; Ingold, G.-L. ; [et al.]

Springer

The European physical journal 3 (1998), S. 387-396

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ISSN: 1434-6036

Keywords: PACS. 73.23.Ad Ballistic transport - 03.65.Sq Semiclassical theories and applications

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract: We study the influence of a tunnel barrier on the quantum transport through a circular cavity. Our analysis in terms of classical trajectories shows that the semiclassical approaches developed for ballistic transport can be adapted to deal with the case where tunneling is present. Peaks in the Fourier transform of the energy-dependent transmission and reflection spectra exhibit a nonmonotonic behaviour as a function of the barrier height in the quantum mechanical numerical calculations. Semiclassical analysis provides a simple qualitative explanation of this behaviour, as well as a quantitative agreement with the exact calculations. The experimental relevance of the classical trajectories in mesoscopic and microwave systems is discussed.