DOI: https://doi.org/10.18429/JACoW-MEDSI2025-THP52

Kohzu Precision Co., Ltd., in collaboration with the International Center for Synchrotron Radiation Innovation Smart (SRIS) at Tohoku University and the Photon Science Innovation Center (PhoSIC),
has demonstrated world-class stability for a Double Crystal Monochromator (DCM) under dynamic operating conditions.
The research paper detailing these results has been officially published in the proceedings of the 13th International Conference on Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation (MEDSI 2025) held in Lund, Sweden.

■ Background and Framework
This research was conducted under the framework of the “Cooperation Agreement on X-ray Crystal Monochromators for NanoTerasu” between Kohzu Precision and PhoSIC.
The agreement aims to advance world-leading technological developments for the 3GeV next-generation synchrotron radiation facility “NanoTerasu,” contributing to the progress of photon science and innovation.

■ Technical Highlights

• Verification of State-of-the-Art Stability:The TX-DCM produced by Kohzu Precision achieved a pitching stability of 17.15 nrad (RMS) under practical operating conditions with active water cooling.
  This performance reaches the pinnacle of current global technological standards, fully meeting the extreme stability requirements of next-generation synchrotron facilities.
  
  
• Establishment of High-Precision Evaluation Method:A novel measurement system was established 　using high-speed optical linear encoders directly coupled to the crystal holders.
  This method allows for a direct assessment of the intrinsic mechanical stability of the monochromator, independent of external beamline optics, ensuring superior quality control for delivered products.