Fabrication And Use Of Silicon Carbide Mirrors For Synchrotron Radiation

摘要: The high thermal conductivity and low expansion of silicon carbide make it an ideal mirror material for synchrotron radiation applications. Such mirrors must withstand absorption a few kilowatts x-ray flux without degradation or distortion. Silicon has the added advantage reflectance in vacuum UV. Many different polycrystalline forms are available. fabrication hot pressed, reaction bonded chemical vapour deposited (CVD) is described, from manufacture initial blanks, through diamond grinding optical figure, to final polishing installation synchrotron. suitability each these materials as substrates been assessed point view crystal structure, polishability, figure stability, compatibility. Chemical gives excellent finish, best polished sample produced so far having three times that gold at 584 R, but difficult large flat pieces. pressed much more easily obtainable take good enough polish most Several flat, spherical cylindrical CVD, planned have use premirrors Synchrotron Radiation Source (SRS) Daresbury. Their performance during machine operation future availability discussed.