Full-field and full-spectrum response efficiency calibration of x-ray grazing incidence microscope
Yankang Wu, Wei Liu, Xing Zhang, Shaoyong Tu, Pin Yang, Jianjun Dong, Ao Sun, Shengxin Ke, Jianhua Zheng, Jie Xu, Jiapeng Shi, Mingtao Li, Mingxun Wang, Baozhong Mu, Feng Wang, Zhentian Wang, Yuchi Wu, Dong Yang, Jiamin Yang, Zongqing ZhaoQuantitative analysis of inertial confinement fusion (ICF) implosion hotspots requires accurate measurements of spatially distributed x-ray emission spectra. Kirkpatrick–Baez (KB) x-ray microscopes are widely used for hotspot diagnostics in major ICF facilities; however, accurate calibration of their full-field and full-spectrum response efficiency remains challenging due to multi-parameter coupling and spatially nonuniform optical response. In this study, we present an efficient calibration method for a KB microscope by combining theoretical modeling with experimental reflectivity measurements. The response efficiency is described in terms of the collection solid angle, magnification, and angle-dependent mirror reflectivity, while experimental data are used to calibrate key model parameters, including the effective grazing incidence angle and a global intensity correction factor accounting for system-level losses. The method is applied to a four-channel, energy-adaptive KB microscope, enabling determination of the spatial distribution of the effective response energy and the full-spectrum response efficiency over the entire field of view. This approach provides a reliable basis for quantitative ICF hotspot imaging diagnostics.