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Hard x-ray spectral energy distributions from pulsed power generators measured by transmission crystal spectrometers


Summary form only given. Hard x-ray tungsten spectra from the NRL Gamble II generator were recorded by a transmission crystal spectrometer in the photon energy range > 10 keV. The crystal diffraction efficiencies were accurately calibrated,2 and this enables the accurate measurement of the absolutely-calibrated photon energy distribution from pulsed power generators. When measuring spectra in the 20 to 70 keV range, which is of interest for x-ray damage studies, the Gamble II experiments demonstrated the need to shield against higher energy photons up to the peak kilovoltage of the pulsed-power generator. In addition, a spectrometer optimized for measuring the x-ray fluence should be able to record the photon energy distribution from the entire area of a wide x-ray source on a single discharge. A new spectrometer has been designed that can record the absolutely-calibrated 20-70 keV photon energy distribution from a 12” diameter source such as produced by the Saturn generator. The spectra from the left and right sides of the source are spatially resolved on the detector, and a slot aperture provides spatial resolution in the perpendicular direction. The spectrometer can be deployed at standoff distances in the 2 to 4 meter range and can record the spatially resolved spectra from a single discharge on an image plate detector. The spectrometer has a linear geometry with a central axis, and the spectrometer is easily aligned using a laser propagating along the central axis and pointing to the center of the x-ray source. Spectrometers of this type have been custom designed for recording hard x-ray spectra at short-pulse laser facilities with shielding against MeV photons, and the same shielding techniques can be applied to recording spectra from energetic pulsed-power generators. Using an absolutely calibrated x-ray source at NIST, the individual spectrometer components such as crystal and filters can be calibrated to few percent accuracy. The sp- ctrometer's final end-to-end sensitivity calibration, which relates the detector signal to the source fluence, can be performed to better than 20% absolute accuracy. Such accurate measurement of the x-ray fluence from pulse-power generators will greatly improve the analysis and mitigation of x-ray irradiation damage.......

【作者名称】: Seely, John, Feldman, Uri, Weber, Bruce
【作者单位】: Artep Inc., Ellicott City, MD, USA,
【关 键 词】: X-ray production, X-ray spectra, X-ray spectrometers, spectrometer accessories, tungsten, NRL Gamble II generator
【会议名称】: The 41st IEEE International Conference on Plasma Science, and the 20th International Conference on High-Power Particle Beams
【期刊论文数据库】: [DBS_Articles_01]
【期刊论文编号】: 100,835,275
【摘要长度】: 2,295
【会议地点】: Washington, DC(US)
【会议组织】: Artep Inc., Ellicott City, MD, USA;;;;
【会议时间】: 2014
【上篇论文】: 外文会议 - Numerical Simulation and Mechanism Analysis of a Slender Delta Wing Undergoing Combined Free-roll and Free-sideslip Motion
【下篇论文】: 外文会议 - NANOGELS AND NANOCOMPOSITES FOR OVERDOSED DRUG AND POLLUTANT EXTRACTION

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