Conical geometry for sagittal focusing as applied to X rays from synchrotrons
The authors describe a method for simultaneously focusing and monochromatization of X rays from a fan of radiation having up to 15 mrad divergence in one dimension. This geometry is well suited to synchrotron radiation sources at magnifications of one-fifth to two and is efficient for X-ray energies between 3 and 40 keV (0.48 and 6.4 fJ). The method uses crystals bent to part of a cone for sagittal focusing and allows for the collection of a larger divergence with less mixing of the horizontal into the vertical divergence than is possible with X-ray mirrors. They describe the geometry required to achieve the highest efficiency when a conical crystal follows a flat crystal in a nondispersive two-crystal monochromator. At a magnification of one-third, the geometry is identical to a cylindrical focusing design described previously. A simple theoretical calculation is shown to agree well with ray-tracing results. Minimum aberrations are observed at magnifications near one. Applications of the conical focusing geometry to existing and future synchrotron radiation facilities are discussed.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6191311
- Report Number(s):
- ORNL/TM-12327; ON: DE93017238
- Country of Publication:
- United States
- Language:
- English
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Conical geometry for sagittal focusing as applied to x rays from synchrotrons
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Related Subjects
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
CRYSTALS
CONICAL CONFIGURATION
SYNCHROTRON RADIATION
FOCUSING
X RADIATION
KEV RANGE
MONOCHROMATORS
SPECIFICATIONS
SYNCHROTRON RADIATION SOURCES
BREMSSTRAHLUNG
CONFIGURATION
ELECTROMAGNETIC RADIATION
ENERGY RANGE
IONIZING RADIATIONS
RADIATION SOURCES
RADIATIONS
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