Numerical and experimental study of grating efficiency for synchrotron monochromators.

The development of third-generation synchrotron sources has stimulated efforts toward high-resolution monochromators. A good knowledge of grating efficiency is needed to achieve an optimal compromise between resolution and photon flux. Because simple geometric models fail to describe correctly the gratings properties in the UVtosoft-X-ray range, we have developed a simulation software based on differential theory.

Electromagnetic-field distribution measurements in the soft x-ray range: full characterization of a soft x-ray laser beam.

We report direct measurement of the electromagnetic-field spatial distribution in a neonlike Ar capillary discharge-driven soft x-ray laser beam. The wave front was fully characterized in a single shot using a Shack-Hartmann diffractive optics sensor. The wave front was observed to be dependent on the discharge pressure and capillary length, as a result of beam refraction variations in the capillary plasma.

Kirkpatrick-Baez microscope based on a Bragg-Fresnel x-ray multilayer focusing system.

We demonstrate how to use a cylindrical Bragg-Fresnel multilayer focusing system instead of spherical mirrors for two-dimensional focalization. We performed our tests at 8 keV with a collimated x-ray tube having an apparent anode source size of 75 microm x 100 microm. These tests demonstrate that focalization can be obtained within <20 microm.

Multilayer x-ray mirror calibration by an energy dispersive method using an x-ray tube and a si(li) detector: absolute reflectivity, energy band pass, and overlapping order determination.

We describe under which conditions the x-ray energy dispersive method permits absolute reflectivity, energy band pass, and overlapping order determination on artificial multilayers. For such measurements a Si (Li) detector and a simple x-ray tube are used. Examples of experimental results on W/Si and Mo/Si x-ray mirrors are given for the photon energy range from 5 to 40 KeV.