X-ray Imaging Schemes with Matched Pairs of Spherically Bent Crystals*

The paper describes two x-ray imaging schemes with matched pairs of spherically bent crystals, which may be of interest for the diagnosis of laser-produced plasmas. The first scheme eliminates the astigmatism and thus allows for a point-to-point, one-dimensional, imaging at almost arbitrarily large angles of incidence with high spectral resolution. The second scheme allows for two-dimensional, point-to-point, imaging with a large magnification at a particular wavelength. An advantage common to both schemes is that the detector can easily be protected from debris.