FOCUSING PARABOLIC PYROLYTIC-GRAPHITE X-RAY MONOCHROMATOR

Results of the experimental testing of the focusing parabolic pyrolyti c graphite X-ray monochromator on the wiggler synchrotron radiation be amline of the VEPP-3 storage ring (2 GeV, 100-150 mA) are presented. T he monochromatization and the focusing of X-radiation in both vertical and horizontal directions are provided by the optical properties of t he parabolic surface of revolution of the properly shaped pyrolytic gr aphite crystal attached to the parabolic-machined brass support. A sin gle crystal is a half of the parabolic surface of 160 mm long and of s imilar to 19 mm minimal focus length. The sagittal radii are changed f rom 10 to 30 mm. The available photon energy range is 7-20 keV on the first reflection harmonic. The second reflection order is still compar able with the first one in intensity: due to this fact the energy rang e can be extended up to 40 keV. Changing the energy of the monochromat ized X-radiation is accomplished by a simple vertical shift of the mon ochromator.