Bent-crystal Laue spectrograph for measuring x-ray spectra ( 15 < E < 100 keV )

A bent-crystal Laue {or Cauchois [ J. Phys. Radium 3 , 320 ( 1932 ) ] geometry} spectrograph is a good compromise between sensitivity and spectral resolution for measuring x-ray spectra ( 15 < E < 100 keV ) from large area x-ray sources because source-size spectral broadening is mitigated. We...

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Bibliographic Details
Published in:Review of scientific instruments 2006-10, Vol.77 (10), p.10F314-10F314-4
Main Authors: Failor, B. H., Wong, S., Riordan, J. C., Hudson, L. T., O'Brien, C. M., Seltzer, S. M., Seiler, S., Pressley, L., Lojewski, D. Y.
Format: Article
Language:English
Subjects:
BIOMEDICAL RADIOGRAPHY
CHARGE-COUPLED DEVICES
CRYSTALS
ELECTRON BEAMS
ICF DEVICES
INERTIAL CONFINEMENT
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
KEV RANGE
LITHIUM FLUORIDES
MAMMARY GLANDS
PHOTOMULTIPLIERS
RADIOLOGY AND NUCLEAR MEDICINE
REFLECTIVITY
RESOLUTION
SENSITIVITY
X RADIATION
X-RAY DIFFRACTION
X-RAY SOURCES
X-RAY SPECTRA
X-RAY SPECTROMETERS
X-RAY TUBES
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Summary:A bent-crystal Laue {or Cauchois [ J. Phys. Radium 3 , 320 ( 1932 ) ] geometry} spectrograph is a good compromise between sensitivity and spectral resolution for measuring x-ray spectra ( 15 < E < 100 keV ) from large area x-ray sources because source-size spectral broadening is mitigated. We have designed, built, and tested such a spectrograph for measuring the spectra from electron-beam x-ray sources with diameters as large as 30 cm . The same spectrograph geometry has also been used to diagnose (with higher spectral resolution) smaller sources, such as x-ray tubes for mammography and laser-driven inertial fusion targets. We review our spectrograph design and describe the performance of different components. We have compared the reflectivity and spectral resolution of LiF, and Ge diffracting crystals. We have also measured the differences in sensitivity and spectral resolution using different x-ray to light converters (plastic scintillator, CsI, and Gd 2 O 2 S ) fiber optically coupled to an intensified charge-coupled device camera. We have also coupled scintillating fibers to photomultiplier tubes to obtain temporal records for discrete energy channels.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.2229265