In inertial confinement fusion, the slight driven asymmetry or small defects in the shell may lead to a rapid growth of the Rayleigh-Taylor (RT) instability and the formation of a "spike-bubble" structure during the stagnation phase, resulting in a degradation of symmetry and an increase in mixing in the hot spot. Diagnostics of high-mode asymmetries of the stagnated hot spot is crucial. Considering the size of the hot spot and the motion blur, the imaging diagnostics needs a spatial resolution of less than 3μm and a temporal resolution of about 10ps. It is beyond the capability of the already developed Kirkpatrick-Baez (KB) microscope with an X-ray framing camera (XFC), which has the resolution of about 7μm and 80ps.
In this work, an imaging system consists of a Wolter-like microscope and a pulse dilated XFC is presented. The microscope has the Wolter-I type mirror configurations in the sagittal and meridian directions respectively and the imaging aberrations are suppressed by the combination of the hyperbolic and elliptical mirrors. The object distance is about 20cm and the magnification is set as about 25. The mirrors use the Pt film and the maximum reflectivity X-ray energy is around 8 keV. The static imaging resolution is less than 2 μm in a field-of-view of 400 μm. In the present prototype pulse dilated XFC, two CsI cathode chips with a width of 10 mm are coated in the center, the tested temporal resolution of the XFC is about 10ps and the spatial resolution is about 20 lp/mm. The prototype pulse dilated Wolter-like X-ray microscope is installed on the Shenguang-III prototype laser facility. The comprehensive spatial resolution is about 3μm in a field-of-view of 400μm, and the temporal resolution is about 10ps. The performance of imaging of the stagnant hot spot will be tested in the following work.
 

Wolter-like X-ray microscope, Pulse Dilated X-ray Camera, Stagnated Hot Spot Imaging, High-modes Asymmetry Diagnostics