The diagnostic demand of hot-spot intensity distribution in laser inertial confinement fusion experiment has motivated quantitative measurement experiment to give the response efficiency of grazing incidence system to improve the accuracy of the diagnosis. In our study, a full-aperture intensity response measurement method is proposed, which is based on pinhole-scanning field of view (FOV) to obtain the response efficiency of grazing incidence system. The method is highly repeatable and enables response efficiency measurements over the full FOV with acceptable accuracy. A silicon positive-intrinsic-negative detector with an energy response range of 1.5 to 30 keV is used to directly detect the input and output spectrum. The response efficiency of a single-channel aspheric Kirkpatrick–Baez (KB) microscope coated with W/Si is obtained under the FOV of ±150 μm. The response efficiency of center FOV of the KB system is measured to be 2.52E-7 sr. The value is promising, as it shows a 6.6% maximum deviation from the theoretical value at center FOV, with a global uncertainty of 7.4%.
High-resolution imaging diagnosis of X-ray plasma distribution during implosion deceleration phase is urgently needed in inertial confinement fusion experiments. The current curved crystal imaging and the conventional Kirkpatrick-Baez microscope have a spatial resolution of 5 μm, so it is insufficient to obtain the evolution details of implosion target shell and hot spot. In this paper, an aspherical Kirkpatrick-Baez microscope is proposed, to achieve a higher spatial resolution. Simultaneously, an optical design method for aspherical structures is introduced. The imaging system has high reflectivity and good monochromatic performance using periodic multilayer technology. The characterization results show that this imaging system can reach a high spatial resolution of 2 μm in the central field of view.
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