Optimization Design Of High-energy Laue Monochromator Crystal Bender

The phase-? project of Shanghai Synchrotron Radiation Facility(SSRF)will build the ultra-hard applications beamline.This beamline will use superconducting wiggler as light source and the horizontal divergent angle is very large which is approximately about 6 mrad.To utilize this light source effectively,a high-energy double Laue monochromator(DLM)will be employed in this beamline.The sagittal bender is the core component of the DLM,also the optimization of the sagittal and meridional radius will have great effects on the monochromatic beam flux and energy resolution.Therefore,the factors which will affect the sagittal and meridional radius will be found in this dissertation,together with the references for the optimization design of the bender provided.This thesis introduces several characteristics of the ultra-hard applications beamline,components of the DLM and the working principle of the DLM.Besides the choice of crystal,lattice plane and bending radius are explained.Moreover,the advantages and disadvantages of common bending modes accompanied with mechanical bending modes of the DLM are discussed.Apart from it,the design indexes of the DLM,the bending and regulation systems are introduced in this thesis.This thesis introduces the finite element method and the finite element analysis(FEA)model is established with ANSYS Workbench.The anisotropic single crystal silicon,aspect ratio,the pressure angle and the size parameters of the leaf springs are accurately simulated.According to the analysis results,it is shown that the cutting edge of crystal length and width goes along the [011] and [0-11] direction,respectively.The optimized crystal geometry is 90 mm×40 mm×1 mm,and the effective length and width are 70 mm and 40 mm.When the pressure angle and the effective length,width and thickness of the leaf springs are 0.015°,53±0.25 mm,0.50+0.01 mm and 50±0.25 mm,the sagittal and meridional radius will satisfy the design requirements.The thermal analysis is carried out on the bender,and the two different loading ways of the thermal load are compared.Proposed by changing the material of the leaf springs can decrease the crystal temperature,and the optimization result shows that the crystal temperature can reduce 21.82 ?.The displacement load and thermal load are carried out on the bender together and the results meet the design requirements.Using the model of anisotropic silicon crystals to simulate the bender of the DLM is the innovation point of this thesis,and the size consistency of the leaf springs effects on bending radius is considered in combination with the engineering practice.The crystal temperature of the DLM can be decreased through optimizing the material of the leaf springs.The optimization results have applied to the prototype of the bender.