OBERTA, P., Petr MIKULÍK, M. KITTLER, J. HRDÝ and L. PEVERINI. Diffractive-refractive optics: low-aberration Bragg-case focusing by precise parabolic surfaces. Journal of Synchrotron Radiation. 2010, vol. 17, No 1, p. 36-40. ISSN 0909-0495. |
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@article{866746, author = {Oberta, P. and Mikulík, Petr and Kittler, M. and Hrdý, J. and Peverini, L.}, article_number = {1}, keywords = {diffractive-refractive optics; aberration; parabolic groove; x-ray optics; x-ray diffraction}, language = {eng}, issn = {0909-0495}, journal = {Journal of Synchrotron Radiation}, title = {Diffractive-refractive optics: low-aberration Bragg-case focusing by precise parabolic surfaces}, url = {http://www3.interscience.wiley.com/journal/123238603/abstract}, volume = {17}, year = {2010} }
TY - JOUR ID - 866746 AU - Oberta, P. - Mikulík, Petr - Kittler, M. - Hrdý, J. - Peverini, L. PY - 2010 TI - Diffractive-refractive optics: low-aberration Bragg-case focusing by precise parabolic surfaces JF - Journal of Synchrotron Radiation VL - 17 IS - 1 SP - 36-40 EP - 36-40 SN - 09090495 KW - diffractive-refractive optics KW - aberration KW - parabolic groove KW - x-ray optics KW - x-ray diffraction UR - http://www3.interscience.wiley.com/journal/123238603/abstract N2 - Based on analytical formulae calculations and ray-tracing simulations a low-aberration focal spot with a high demagnification ratio was predicted for a diffractive-refractive crystal optics device with parabolic surfaces. Two Si(111) crystals with two precise parabolic-shaped grooves have been prepared and arranged in a dispersive position (+,-,-,+) with high asymmetry. Experimental testing of the device at beamline BM05 at the ESRF provided a focal spot size of 38.25 um at a focal distance of 1.4 m for 7.31 keV. This is the first experiment with a parabolic-shaped groove; all previous experiments were performed with circular grooves which introduced extreme aberration broadening of the focal spot. The calculated and simulated focal size was 10.8 um at a distance of 1.1 m at 7.31 keV. It is assumed that the difference between the measured and calculated/simulated focal spot size and focal distance is due to insufficient surface quality and to alignment imperfection. ER -
OBERTA, P., Petr MIKULÍK, M. KITTLER, J. HRDÝ and L. PEVERINI. Diffractive-refractive optics: low-aberration Bragg-case focusing by precise parabolic surfaces. \textit{Journal of Synchrotron Radiation}. 2010, vol.~17, No~1, p.~36-40. ISSN~0909-0495.
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