Abstract
We report on the design and implementation of a new system used to characterize the energy-dependent x-ray transmission curve, Θ(E), through filters used in high-energy density physics diagnostics. Using an Amptek X-123-CdTe x-ray spectrometer together with a partially depleted silicon surface barrier detector, both the energy spectrum and total emission of an x-ray source have been accurately measured. By coupling these detectors with a custom PROTO-XRD x-ray source with interchangeable cathodes, accurate characterizations of Θ(E) for filters of varying materials and thicknesses have been obtained. The validity of the technique has been confirmed by accurately reproducing areal densities for high-purity filters with known x-ray transmission properties. In this paper, the experimental setup is described and the results of absorption calibrations performed on a variety of different filters are presented.
Highlights
AND MOTIVATIONX-ray diagnostics of various kinds are critical to the study of high-energy density physics (HEDP), where they are employed at many institutions for a wide array of purposes
We report on the design and implementation of a new system used to characterize the energy-dependent x-ray transmission curve, Θ(E), through filters used in high-energy density physics diagnostics
By using a partially depleted surface barrier detector together with an AMPTEK 123-CdTe x-ray spectrometer and a custom Proto-XRD source, we have developed an x-ray test bench facility, which is able to accurately measure both the energy spectrum and time-resolved x-ray fluence of the source
Summary
X-ray diagnostics of various kinds are critical to the study of high-energy density physics (HEDP), where they are employed at many institutions for a wide array of purposes. X-ray diagnostics at the OMEGA Laser Facility include the Cryo Particle X-ray Temporal Diagnostic (CryoPXTD) used for the measurement of time-resolved electron temperature, the xray penumbral imager for measuring electron temperature profiles, and the Rowland x-ray spectrometer (XRS), and at the National Ignition Facility, the Titanium Differential Filter Spectrometer (TiDFS) for measuring the hotspot temperature and the Streaked Polar Instrumentation for Diagnosing Energetic Radiation (SPIDER).. X-ray diagnostics at the OMEGA Laser Facility include the Cryo Particle X-ray Temporal Diagnostic (CryoPXTD) used for the measurement of time-resolved electron temperature, the xray penumbral imager for measuring electron temperature profiles, and the Rowland x-ray spectrometer (XRS), and at the National Ignition Facility, the Titanium Differential Filter Spectrometer (TiDFS) for measuring the hotspot temperature and the Streaked Polar Instrumentation for Diagnosing Energetic Radiation (SPIDER).5 All these diagnostics involve some form of x-ray filtration, wherein the x rays are incident on a filter with certain transmission properties before being measured. It is valuable to be able to measure the x-ray transmission of such filters directly
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