ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
A fixed-exit channelcut monochromator, which requires only a single rotational movement, has been developed. It is based on profiled reflecting surfaces machined into a Si monocrystal. Two geometries have been evaluated theoretically: one for the energy range from 5 to 30 keV and another for the energy range from 3 to 8 keV. The latter was designed to fulfil the requirements at an x-ray microscopy beamline, where the monochromator must not introduce any change in the phase space of the x-ray beam in order to limit aberrations when microfocusing the beam with a Fresnel zone plate. A monochromator with a very simple and compact mechanical design has been built with this crystal and successfully tested under ultrahigh vacuum. The measured energy resolution (〈1 eV at 5 keV) and throughput are close to the theoretical figures, and the monochromator's suitability for spectroscopic investigations has been demonstrated. The measured beam exit stability was 150 μm over a 3.5–8 keV range. The influence of the crystal geometry on its energy acceptance, phase space degradation, throughput, and acceptable heat load is discussed. © 1999 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1149690
