Zobrazeno 1 - 10
of 145
pro vyhledávání: '"Andreas K. Freund"'
Publikováno v:
Journal of Applied Crystallography. 55:247-257
The neutron diffraction properties of highly oriented pyrolytic graphite (HOPG) are reviewed using experimental results that have been obtained by diffraction of high-energy gamma rays, X-rays and neutrons. The interpretation of the empirical data ba
Autor:
Andreas K. Freund, Changyong Chen, Mike Crosby, Gergely Farkas, Brian Kozak, Dawn Krencisz, Xiang Liu, Pavol Mikula
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 1048:168012
Publikováno v:
Journal of Applied Crystallography. 46:1699-1704
The new double crystal ultra-small-angle neutron scattering instrument Kookaburra, currently under construction at the ANSTO OPAL reactor, will allow characterization of microstructures covering length scales in the range of 0.1 to 10 µm. Using the
Autor:
Andreas K. Freund
Publikováno v:
Synchrotron Radiation News. 20:31-34
Twenty years is a long time, but it seems to me as if it were yesterday when the three of us—Michel Belakhovsky, Christian Riekel and I—first scientists of the Experiments Division (except the directors) at the not yet created European Synchrotro
Autor:
Andreas K. Freund, Karen K.-W. Siu, Erol C. Harvey, Peter P. Wells, Tetsuya Ishikawa, T. Bigault, Andrei Yu Nikulin
Publikováno v:
Journal of Applied Physics. 93:5161-5166
An unambiguous inverse solution from Fraunhofer diffraction data has been achieved for an amorphous sample of low-molecular weight. The complex scattering amplitude has been reconstructed with submicron spatial resolution using the phase retrieval x-
Autor:
Andreas K. Freund
Publikováno v:
Journal de Physique IV (Proceedings). 104:165-170
It is the task of x-ray optics to adapt the raw beam generated by modem sources such as synchrotron storage rings to a great variety of experimental requirements in terms of intensity, spot size, polarization and other parameters. The very high quali
Autor:
J. Hoszowska, Andreas K. Freund, B. Nöhammer, Christian David, A. Simionovici, Andrea Somogyi
Publikováno v:
Journal de Physique IV (Proceedings). 104:223-226
The fabrication and testing of planar refractive lenses made from diamond and silicon is reported. We obtained efficiencies up to 78% and 31 % for diamond and silicon lenses, respectively. A FWHM of the line-focus down to 3 pm has been achieved for b
Publikováno v:
Journal of Synchrotron Radiation. 10:168-171
The fabrication and testing of planar refractive hard X-ray lenses made from bulk CVD diamond substrates is reported. The lens structures were generated by electron-beam lithography and transferred by reactive-ion etching into the diamond. Various le
Autor:
K. Elsener, Ulrik I. Uggerhøj, Cristina Biino, M. Velasco, L. Gatignon, P. Grafström, Niels Doble, Andreas K. Freund, V.V Uzhinskii, Alexander M. Taratin, M. Clement, W. Herr
Publikováno v:
Aarhus University
Biino, C, Clément, M, Doble, N, Elsener, K, Freund, A, Gatignon, L, Grafström, P, Herr, W, Taratin, A, Uggerhøj, U I, Uzhinskii, V V & Velasco, M 2002, ' On the reduced interaction probability for fully stripped 33 TeV/c Pb ions channeled in a bent Si crystal ', Nucl. Instr. Meth., vol. B,194, pp. 417 .
Biino, C, Clément, M, Doble, N, Elsener, K, Freund, A, Gatignon, L, Grafström, P, Herr, W, Taratin, A, Uggerhøj, U I, Uzhinskii, V V & Velasco, M 2002, ' On the reduced interaction probability for fully stripped 33 TeV/c Pb ions channeled in a bent Si crystal ', Nucl. Instr. Meth., vol. B,194, pp. 417 .
We compare experimental results and computer simulations on the reduction of inelastic interactions for 33 TeV Pb82+ ions channeled in a bent silicon crystal. The comparison shows that a very small fraction of the initially channeled ions suffer nucl
Autor:
Simon Henry Connell, J.P.F. Sellschop, M. Rebak, J. Hoszowska, Andreas K. Freund, R. C. Burns
Publikováno v:
physica status solidi (a). 193:415-422
The ongoing need for single crystal diamond of high quality in physics research and application, has been amply demonstrated. This need cannot be satisfied by access to natural diamonds. In recent years much progress has been made in the synthesis of