High-Energy Bragg and Laue Monochromators for an APS Wiggler Beamline
- Experimental Facilities Division, Advance Photon Source, Argonne National Laboratory, Argonne, IL 60439 (United States)
- Max-Planck-Institute for Solid State Research, Stuttgart, 70569 (Germany)
The elliptical multipole wiggler located at Sector 11 of the Advanced Photon Source has a maximum critical energy of 32 keV and a total power output of {approx} 8 kW. The device produces circularly polarized X-rays on-axis and linearly polarized X-rays above and below the ring plane. A double crystal monochromator intercepts the lower linearly polarized radiation to be used in the 11ID-D experimental station for scattering and spectroscopy experiments in the 5 to 40 keV energy range. The on-axis circularly polarized photons and upper linearly polarized photons are monochromatized by one crystal horizontally deflecting monochromators at fixed Bragg angles of {theta} = 3.8 deg. and {theta} = 1.9 deg. respectively. We will present here the designs and detail the performance of Laue and Bragg monochromator designs for these two beamlines which operate at fixed energies from {approx}60 keV to 125 keV. For the high-energy diffraction station, 11ID-C, which utilizes the upper linearly polarized radiation, the Laue monochromator design allows rapid interchange of crystals and provides a photon flux of 2 x 1012 photons/sec in a 2.5 x 3.5 mm spot at 98 keV using annealed Silicon crystals (Si(220)). The Bragg monochromator design provides focusing and a smaller bandwidth while retaining a high photon flux. The high heatloads generated by the EMPW present design challenges for both monochromator designs.
- OSTI ID:
- 20653039
- Journal Information:
- AIP Conference Proceedings, Vol. 705, Issue 1; Conference: 8. international conference on synchrotron radiation instrumentation, San Francisco, CA (United States), 25-29 Aug 2003; Other Information: DOI: 10.1063/1.1757886; (c) 2004 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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