<title>High-intensity monochromatic x-ray beam using doubly curved crystal optics</title>

Doubly curved crystals of Mica, Ge and Si were bent according to Johann-Geometry. Point-to-point focusing of characteristic x-rays can be used to create a highly intense focal spot (50 micrometers FWHM) of 6.7 X 10⁸ photons/s using a doubly curved Ge crystal and a 15 W Cr x-ray source. The output focal spot size was shown to be dependent on the spot size of the source. Focal spots of less than 50 micrometers were achieved. Doubly curved crystals have useful properties for monochromatic micro x-ray fluorescence measurements.