With emergence of focusing X-ray optics many configurations of X-ray microscope have been developed. In this paper we report on a laboratory X-ray microscope based on refractive X-ray optics and microfocus laboratory source. In our experimental setup we use parabolic Compound Refractive X-ray Lens (CRL) made of beryllium and capillary spherical CRL made of epoxy. A copper 2000 mesh grid with 13 μm period and the width of the wire of about 4-5 μm has been clearly resolved with good enough contrast in transmission full-field X-ray microscopy mode. The advantages of the two-lens design have been shown experimentally for both transmission full-field and scanning X-ray microscopes. The discussion of the optimal distances between optical elements in the X-ray microscope is presented.
In the present paper we describe X-ray glitches and diffraction losses in monocrystalline diamond X-ray refractive lenses. For this purpose, X-ray spectroscopy of several types of diamond lenses was done at the BM31, ESRF. X-rays were propagating through lenses, while the transmitted intensity was measured at different energies. Use of compound refractive lenses, that were perfectly aligned by stacking in a single plate, gave us strong diffraction losses, reducing the outgoing signal by maximal value of 35%. The magnitude of the effect was then minimized down to ~ 10% by use of CRLs compiled from individual lenses with different crystallographic orientation. At the same time, X-ray glitches did not affect any focal spot’s size or shape while only arousing the darkening of the focal spot at exact energies of X-ray glitches.