Performance of the Cygnus X-ray source

Smith, J. R.; Carlson, R. R.; Fulton, R. D.; Chavez, J.; Coulter, W.L.; Gibson, William A.; Helvin, T.; Henderson, David; Mitton, V.; Ormond, Eugene C.; Ortega, P.; Ridlon, R.N.; Vallerio, A.

doi:10.1109/plasma.2002.1030660

Cited by 22 publications

(7 citation statements)

References 1 publication

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“…To validate the source and detector system models, we compared these results to measurements made with the Cygnus system at the LANL R-306 site. 1 We obtained excellent agreements (less than 3% in photon transmittance) between our step-wedge calculations and experimental data analysis. In the front end of the linked calculations, the 2D PIC code MERLIN models the electron beam dynamics in the rodpinch diode.…”

Section: Source Model and Detector Responsesupporting

confidence: 57%

A physics model of lutetium oxyorthosilicate detectors: theory and experimental validation

et al. 2004

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Detector physics is an important element in the simulation of X-ray radiography. In conjunction with the radiographic chain model (RCM) developed at Los Alamos National Laboratory (LANL), we have built a highfidelity model of the Lu 2 SiO 5 :Ce 3+ (LSO) detector system for use with the Cygnus rod-pinch X-ray source. In the RCM, the two-dimensional (2D) fully electromagnetic and relativistic particle-in-cell (PIC) code MERLIN is used to model the Cygnus electron diode. The electron distributions from PIC calculations are used in the Monte Carlo N-Particle (MCNP) code to model the generation of the X-rays via the bremsstrahlung process and subsequent transport through dense objects to detectors. Radiographs are calculated in conjunction with empirically measured scintillation efficiencies for light yields. To model detector blur, MCNP calculates the point-spread functions (PSF) of X-ray scattering in the LSO. Two length scales in the PSFs can account for correlated short-range (< 0.4 mm) and long-range (uncorrelated) blur. By employing a detector model methodology, we can examine detector parameters such as the detector quantum efficiency (DQE), blur, and photon statistics. The calculations are validated in juxtaposition with experimental radiographic data on step wedges, rolled edges, and static objects. In this paper, we focus on characterizing the detector performance.

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Section: Source Model and Detector Responsesupporting

confidence: 57%

A physics model of lutetium oxyorthosilicate detectors: theory and experimental validation

et al. 2004

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“…Consistency of dose measurements is the most important metric of Source performance [1]. To this end we investigated fading which is the loss of signal in thermoluminescent materials over time.…”

Section: Calibrationmentioning

confidence: 99%

Lithium Fluoride TLD dose quality

Ormond

Bozman

Cordova

et al. 2013

2013 19th IEEE Pulsed Power Conference (PPC)

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Lithium Fluoride (LiF) Thermoluminescent Dosimeters (TLD's) have been used extensively as a diagnostic in radiographic facilities. For over three years we have used precision-calibrated TLD's in our facility. Said facility consists of two radiographic sources, each with a dose rating of 4-Rad at 1 m. The calibration and fielding of TLD's will be examined for accuracy and long term stability. TLD's will be evaluated in single point measurements and multi-point arrays. Overlaying threechip TLD measurements will be compared to single chip TLD measurements. TLD results will also be compared to Pin Diodes for routine shot diagnosis and evaluation of shielding around the sources.

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“…The x-ray beam was modeled as produced by a 2.4 MeV Cygnus source [28] because the energy spectrum is well characterized and representative of more common polychromatic sources. We approximated this continuous source as 23 discrete monoenergetic sources of weighted intensities.…”

Section: Simulation Conditions and Data Generationmentioning

confidence: 99%

Quantitative Object Reconstruction Using Abel Transform X-Ray Tomography and Mixed Variable Optimization

Abramson¹,

Asaki²,

Dennis³

et al. 2008

SIAM J. Imaging Sci.

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Abstract. This paper introduces a new approach to the problem of quantitative reconstruction of an object from few radiographic views. A mixed variable programming problem is formulated in which the variables of interest are the number and types of materials and geometric parameters. To demonstrate the technique, we considered the problem of reconstructing cylindrically symmetric objects of multiple layers from a single radiograph. The mixed variable pattern search algorithm for linearly constrained problems was applied by means of the NOMADm MATLAB software package. Numerical results are presented for several test configurations and show that, while there are difficulties yet to be overcome, the method is promising for solving this class of problems.

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Performance of the Cygnus X-ray source

Cited by 22 publications

References 1 publication

A physics model of lutetium oxyorthosilicate detectors: theory and experimental validation

A physics model of lutetium oxyorthosilicate detectors: theory and experimental validation

Lithium Fluoride TLD dose quality

Quantitative Object Reconstruction Using Abel Transform X-Ray Tomography and Mixed Variable Optimization

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