Simulation of the Cygnus Rod-Pinch Diode Using the Radiographic Chain Model

Kwan, Thomas J. T.; Berninger, Michael; Snell, C.M.; Wang, T.-S.F.; Yin, L.

doi:10.1109/tps.2009.2014767

Cited by 6 publications

(1 citation statement)

References 12 publications

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“…The Cygnus bremsstrahlung spectra used for these calculations is derived from a result presented by T. Kwan et al 11 Kwan's source model utilizes pulse power parameters and diode geometry, a 2-D particle-in-cell code model (Merlin), and an electron-photon Monte Carlo code to produce a simulated source spectra. These spectra are then rebinned to roughly 100 energy bins, filtered by experimental window geometries, and the peaks normalized.…”

Section: System Modelmentioning

confidence: 99%

Scintillator efficiency study with MeV x-rays

et al. 2014

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We have investigated scintillator efficiency for MeV radiographic imaging. This paper discusses the modeled detection efficiency and measured brightness of a number of scintillator materials. An optical imaging camera records images of scintillator emission excited by a pulsed x-ray machine. The efficiency of various thicknesses of monolithic LYSO:Ce (cerium-doped lutetium yttrium orthosilicate) are being studied to understand brightness and resolution trade-offs compared with a range of micro-columnar CsI:Tl (thallium-doped cesium iodide) scintillator screens. The micro-columnar scintillator structure apparently provides an optical gain mechanism that results in brighter signals from thinner samples. The trade-offs for brightness versus resolution in monolithic scintillators is straightforward. For higher-energy x-rays, thicker materials generally produce brighter signal due to x-ray absorption and the optical emission properties of the material. However, as scintillator thickness is increased, detector blur begins to dominate imaging system resolution due to the volume image generated in the scintillator thickness and the depth of field of the imaging system. We employ a telecentric optical relay lens to image the scintillator onto a recording CCD camera. The telecentric lens helps provide sharp focus through thicker-volume emitting scintillators. Stray light from scintillator emission can also affect the image scene contrast. We have applied an optical light scatter model to the imaging system to minimize scatter sources and maximize scene contrasts.

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Section: System Modelmentioning

confidence: 99%

Scintillator efficiency study with MeV x-rays

et al. 2014

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Aerogel Cherenkov detector for characterizing the intense flash x-ray source, Cygnus, spectrum

Kim

Herrmann

McEvoy

et al. 2016

Review of Scientific Instruments

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An aerogel Cherenkov detector is proposed to measure the X-ray energy spectrum from the Cygnus-intense flash X-ray source operated at the Nevada National Security Site. An array of aerogels set at a variety of thresholds between 1 and 3 MeV will be adequate to map out the bremsstrahlung X-ray production of the Cygnus, where the maximum energy of the spectrum is normally around 2.5 MeV. In addition to the Cherenkov radiation from aerogels, one possible competing light-production mechanism is optical transition radiation (OTR), which may be significant in aerogels due to the large number of transitions from SiO clusters to vacuum voids. To examine whether OTR is a problem, four aerogel samples were tested using a mono-energetic electron beam (varied in the range of 1-3 MeV) at NSTec Los Alamos Operations. It was demonstrated that aerogels can be used as a Cherenkov medium, where the rate of the light production is about two orders magnitude higher when the electron beam energy is above threshold.

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Development of cable fed flash X-ray (FXR) system

Menon

Mitra

Patel

et al. 2017

Review of Scientific Instruments

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Flash X-ray sources driven by pulsed power find applications in industrial radiography, and a portable X-ray source is ideal where the radiography needs to be taken at the test site. A compact and portable flash X-ray (FXR) system based on a Marx generator has been developed with the high voltage fed to the FXR tube via a cable feed-through arrangement. Hard bremsstrahlung X-rays of few tens of nanosecond duration are generated by impinging intense electron beams on an anode target of high Z material. An industrial X-ray source is developed with source size as low as 1 mm. The system can be operated from 150 kV to 450 kV peak voltages and a dose of 10 mR has been measured at 1 m distance from the source window. The modeling of the FXR source has been carried out using particle-in-cell and Monte Carlo simulations for the electron beam dynamics and X-ray generation, respectively. The angular dose profile of X-ray has been measured and compared with the simulation.

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Simulation of the Cygnus Rod-Pinch Diode Using the Radiographic Chain Model

Cited by 6 publications

References 12 publications

Scintillator efficiency study with MeV x-rays

Scintillator efficiency study with MeV x-rays

Aerogel Cherenkov detector for characterizing the intense flash x-ray source, Cygnus, spectrum

Development of cable fed flash X-ray (FXR) system

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