Test results of a diamond double-crystal monochromator at the advanced photon source
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
We have tested the first diamond double-crystal monochromator at the Advanced Photon Source (APS). The monochromator consisted of two synthetic type 1b (111) diamond plates in symmetric Bragg geometry. We tested two pairs of single-crystal plates: the first pair was 6 mm by 5 mm by 0.25 mm and 6 mm by 5 mm by 0.37 mm; the second set was 7 mm by 5.5 mm by 0.44 mm. The monochromator first crystal was indirectly cooled by edge contact with a water-cooled copper holder. We studied the performance of the monochromator under the high-power x-ray beam delivered by the APS undulator A. We found no indication of thermal distortions or strains even at the highest incident power (280 watts) and power density (123 W/mm{sup 2} at normal incidence). The calculated maximum power and power density absorbed by the first crystal were 37 watts and 4.3 W/mm{sup 2}, respectively. We also compared the maximum intensity delivered by the diamond monochromator and by a silicon (111) cryogenically cooled monochromator. For energies in the range of 6 to 10 keV, the flux through the diamond monochromator was about a factor of two less than through the silicon monochromator, in good agreement with calculations. We conclude that water-cooled diamond monochromators can handle the high-power beams from the undulator beamlines at the APS. As single-crystal diamond plates of larger size and better quality become available, the use of diamond monochromators will become a very attractive option.
- OSTI ID:
- 21179549
- Journal Information:
- AIP Conference Proceedings, Vol. 417, Issue 1; Conference: 10. United States national conference on synchrotron radiation instrumentation, Ithaca, NY (United States), 17-20 Jun 1997; Other Information: DOI: 10.1063/1.54594; (c) 1997 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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