Study On High Heat-Load Direct-Water Cooling And Sagittal Focusing Double Crystal Monochromator

Many high precision double crystal monochromators(DCM) will be needed in the SHANGHAI 3^rd generation synchrotron radiation beamlines, with the Projects being construction.However.High precision DCM involved several key techniques has been imported from foreign country at present.So the developing of high precision DCM dependent ourselves in internal is imperative under the situation.In this dissertation, several key techniques of high precision DCM are presented on the development of sagittal focusing DCM with direct water cooling will be used in the BL14B1 and BL16B1 of SSRF.They are includes several aspects:Firstly,different cooling mediums and different structures for High Heat-load cooling technology have been discussed,influence of deformance due High Heat-load for energy resolution of DCM has been analysed,fault&default of mediums and structures' have been summarized,high precision direction incision and diffusion banding technology for Si crystal had been puts forward,deformance due High heat-load had been minished,and diffraction surface precision and diffracted performance of crystal had been advanced.Secondly ,bending focusing mechanism had been deeply analysed in order to increasing beam flux,bending focusing technology using hinge passed bending moment had been put forward,horizontal focused beam had been achieved,divergence of incidence beam of DCM had been enlarged,energy resolution of monochromatic beam had been increased.Thirdly,aimed at high reliability and stability requirement of DCM,influence of crystal deviation from ideal position for Bragg diffraction had been analysed,precision pitch,roll,and yaw adjustment and Fixed-exit technologies had been put forward,in order to achieving high precision beam position.On the basis of the theory of ahead charpters, sagittal focusing double crystal monochromator with direct water cooling has been designed and manufactured used to X-Ray diffraction beamline.Aimed to the requirements of monochromator performance,structure parameters of crystal had been optimized by FEA ,several key techniques had been solved,such directed water cooling of crystal,saggital bending focusing,Fixed-exit,and precision adjustment mechanism.The first saggital focusing and directed water cooling DCM used in project had been successfully developed and manufactured in internal,the main technic indexs had been achieved or exceeded the level of international congeneric equipments.