Accession Number : ADP005104

Title :   Finite Element Analysis of the Distortion of a Crystal Monochromater from Synchrotron Radiation Thermal Loading,

Corporate Author : CALIFORNIA UNIV BERKELEY LAWRENCE BERKELEY LAB

Personal Author(s) : Edwards,W. R. ; Hoyer,E. H. ; Thompson,A. C.

Report Date : OCT 1985

Pagination or Media Count : 10

Abstract : The first crystal of the Brown-Hower x ray monochromator of the LBL-EXXON 54 pole wiggler beamline at Stanford Synchrotron Radiation Laboratory (SSRL) is subjected to intense synchrotron radiation. To provide an accurate thermal/structural analysis of the existing monochromator design, a finite element analysis (FEA) was performed. A very high and extremely localized heat flux is incident on the Si (220) crystal. The crystal, which possesses pronouncedly temperature dependent orthotropic properties, in combination with the localized heat load, make the analysis ideally suited for finite element techniques. Characterization of the incident synchrotron radiation is discussed, followed by a review of the techniques employed in modeling the monochromator and its thermal/structural boundary conditions. The results of the finite element analysis, three dimensional temperature distribution, surface displacements and slopes, and stresses, in the area of interest, are presented. Lastly, the effects these results have on monochromator output flux and resolution are examined.

Descriptors :   *PARTICLE ACCELERATOR COMPONENTS, *MONOCHROMATORS, THERMAL STRESSES, SYNCHROTRONS, FINITE ELEMENT ANALYSIS, X RAY APPARATUS, CRYSTALS, THERMAL RADIATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE