We developed a novel medium energy resolution monochromator(MRM) for Resonant Inelastic X-ray Scattering (RIXS) experiments at the High Energy Photon Source (HEPS) featuring an integrated flexible high-precision positioning system that surpasses conventional designs. Our rotation platform delivers unprecedented performance with a travel range of hundreds of milliradians—three times greater than existing systems—while maintaining sub-microradian precision, with potential for nano-radian resolution if an additional simple configuration is developed. The breakthrough innovation is our two-axis rotation mechanism using parallel decoupled architecture that uniquely combines structural rigidity with precise motion control, solving the longstanding challenge of spatial motion decoupling while enhancing stability. Rigorous simulation and testing confirm all performance metrics exceed design targets. This technology not only meets the exacting requirements for monochromators but extends high-precision capabilities in high-vacuum environments, with our parallel decoupling principle offering transformative potential across multiple precision engineering applications.
Zhang et al. (Thu,) studied this question.