Experimentally determining the relative efficiency of spherically bent germanium and quartz crystals

We have used the EBIT-I electron beam ion trap at the Lawrence Livermore National Laboratory and a duplicate Orion High Resolution X-ray Spectrometer (OHREX) to measure the relative efficiency of a spherically bent quartz (10 1 ̄ 1) crystal (2d = 6.687 Å) and a spherically bent germanium (111) cryst...

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Bibliographic Details
Published in:Review of scientific instruments 2016-11, Vol.87 (11), p.11D620-11D620
Main Authors: Brown, G. V., Beiersdorfer, P., Hell, N., Magee, E.
Format: Article
Language:English
Subjects:
Crystals
Efficiency
Electron beams
Energy resolution
Photons
Quartz
Quartz crystals
Scientific apparatus & instruments
X ray detectors
X ray spectrometers
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Summary:We have used the EBIT-I electron beam ion trap at the Lawrence Livermore National Laboratory and a duplicate Orion High Resolution X-ray Spectrometer (OHREX) to measure the relative efficiency of a spherically bent quartz (10 1 ̄ 1) crystal (2d = 6.687 Å) and a spherically bent germanium (111) crystal (2d = 6.532 Å). L-shell X-ray photons from highly charged molybdenum ions generated in EBIT-I were simultaneously focussed and Bragg reflected by each crystal, both housed in a single spectrometer, onto a single CCD X-ray detector. The flux from each crystal was then directly compared. Our results show that the germanium crystal has a reflection efficiency significantly better than the quartz crystal, however, the energy resolution is significantly worse. Moreover, we find that the spatial focussing properties of the germanium crystal are worse than those of the quartz crystal. Details of the experiment are presented, and we discuss the advantages of using either crystal on a streak-camera equipped OHREX spectrometer.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4962037