An optimized B/Ir supermirror for Einstein Probe focusing mirrors in x-ray region of above 8 keV

Abstract

The Einstein Probe (EP) focusing mirrors is a main load to focus and image X-rays. A single-layer which adopts Nickel substrates and Gold reflective coatings has been used for the EP focusing mirrors and has excellent performance below 8 keV. It is a possibility to enhance the effective area of higher X-ray regions by using the multilayer design. The multilayer with single block is designed and has excellent reflectance at specific X-ray energies above 8 keV. 54 multilayers are used for all mirror shells with different incident angles. The optimized B/Ir supermirror for EP focusing mirrors shows an effective area of up to 152 cm2 in 9 keV. And, the method can be used to design supermirror for higher X-ray regions, which will achieve hard X-ray detection with short focal length focusing mirrors and small hard X-ray detection satellite.