Thermal, structural and diffraction analyses of a gallium-cooled x- ray monochromator

Conference · Mon Jun 01 04:00:00 EDT 1992

OSTI ID:7206665

Rogers, C S; Macrander, A T; Mills, D M

The next generation of synchrotron radiation sources will produce very high power and power density x-ray beams. For example, the Advanced Photon Source (APS) under construction at Argonne National Laboratory will produce beams containing up to 5 kill of power and peak normal power densities in excess of 150 W/mm{sup 2}. Normally, the first optical component to intercept the x-ray beam is a crystal monochromator. This device typically uses a single crystal of silicon or germanium as a band-pass filter according to Braggs' law of diffraction. Under the severe heat loading of modem synchrotron beams, the performance of the monochromator is degraded by reducing the photon throughput and increasing the beam divergence. This paper describes the methods used to calculate the thermally induced deformations in standardly configured monochromator crystals using finite element analysis. The results of these analyses are compared to recent experiments conducted at the Cornell High Energy Synchrotron Source (CHESS) using a high-performance, gallium-cooled crystal. Computer simulations can be used to evaluate the performance of high-heat-load x-ray optics for future synchrotron sources.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 7206665
• Report Number(s): ANL/CP-76521; CONF-920792--8; ON: DE92017063
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603 -- Materials-- Properties
43 PARTICLE ACCELERATORS
430303 -- Particle Accelerators-- Experimental Facilities & Equipment
440200* -- Radiation Effects on Instrument Components
Instruments
or Electronic Systems
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
665300 -- Interactions Between Beams & Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COMPUTERIZED SIMULATION
COOLING
CRYSTALS
DEFORMATION
ELEMENTS
FINITE ELEMENT METHOD
GALLIUM
METALS
MONOCHROMATORS
NUMERICAL SOLUTION
PHYSICAL PROPERTIES
RADIATION SOURCES
SEMIMETALS
SILICON
SIMULATION
SYNCHROTRON RADIATION SOURCES
THERMAL ANALYSIS