Characterization of the rod-pinch diode x-ray source on Cygnus

Oliver, B.V.; Berninger, Michael; Cooperstein, G.; Cordova, S.; Crain, D.J.; Droemer, D.; Haines, T. J.; Hinshelwood, D.D.; King, N. S. P.; Lutz, S. S.; Miller, Carol; Molina, I.; Mosher, D.; Nelson, Daniel S.; Ormond, Eugene C.; Portillo, S.; Smith, J. R.; Webb, Timothy; Welch, D. R.; Wood, W. M.; Ziska, Derek

doi:10.1109/ppc.2009.5386210

Cited by 10 publications

(10 citation statements)

References 8 publications

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“…The x-ray source spot size increased from 0.9 mm to 1.0 mm with the increase in voltage. The resulting dose and spot size are similar to those quoted for the Cygnus accelerator [14]. The lower x-ray dose production on RITS-6 is a result of the 10% lower diode voltage.…”

Section: Rod-pinch Diode Resultssupporting

confidence: 74%

“…At the end of the experiment, the last five shots were fired with a Marx charge of 30 kV, a 20% increase in charge voltage. The geometry and operation of the rodpinch diode in positive polarity has been detailed in several papers and is not treated in detail here [11]- [14]. Shots reported here use a 0.75 mm diameter solid tungsten rod that tapers to 0.25 mm over the last 5 mm.…”

Section: Rod-pinch Diode Resultsmentioning

confidence: 99%

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Positive-polarity rod-pinch experiments on the RITS-6 accelerator

Leckbee

Cordova

Johnston

et al. 2013

2013 19th IEEE Pulsed Power Conference (PPC)

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RITS-6 is an inductive voltage adder based accelerator used for radiographic diode research and development. A recent experiment was conducted to demonstrate that a negative polarity induction voltage adder could operate in positive polarity, at reduced voltage, with minimal reconfiguration and maintenance. Circuit simulations, 2-D electrostatic field calculations, and particle-in-cell simulations were used to evaluate operation of RITS-6 in positive polarity and design hardware modifications. Changes to the RITS-6 accelerator during the conversion from negative-polarity high voltage (5-11 MV) output to positive-polarity low voltage (2-3 MV) output are discussed. The first positive polarity rod-pinch experiment generated 3.5 rad from a 1-mm spot size, comparable to previously published rod-pinch experiments on positive polarity accelerators.

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Section: Rod-pinch Diode Resultssupporting

confidence: 74%

Section: Rod-pinch Diode Resultsmentioning

confidence: 99%

Positive-polarity rod-pinch experiments on the RITS-6 accelerator

Leckbee

Cordova

Johnston

et al. 2013

2013 19th IEEE Pulsed Power Conference (PPC)

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“…One major step towards improving the quantitative capabilities of Los Alamos National Laboratory radiography entails creating a representation of the x-ray spectrum output from the Cygnus rod pinch 17,18,22,24 radiographic machine.…”

Section: Introductionmentioning

confidence: 99%

Shot-by-shot spectrum model for rod-pinch, pulsed radiography machines

Wood

2018

AIP Advances

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A simplified model of bremsstrahlung production is developed for determining the x-ray spectrum output of a rod-pinch radiography machine, on a shot-by-shot basis, using the measured voltage, V(t), and current, I(t). The motivation for this model is the need for an agile means of providing shot-by-shot spectrum prediction, from a laptop or desktop computer, for quantitative radiographic analysis. Simplifying assumptions are discussed, and the model is applied to the Cygnus rod-pinch machine. Output is compared to wedge transmission data for a series of radiographs from shots with identical target objects. Resulting model enables variation of parameters in real time, thus allowing for rapid optimization of the model across many shots. “Goodness of fit” is compared with output from LSP Particle-In-Cell code, as well as the Monte Carlo Neutron Propagation with Xrays (“MCNPX”) model codes, and is shown to provide an excellent predictive representation of the spectral output of the Cygnus machine. Improvements to the model, specifically for application to other geometries, are discussed.

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“…The Cygnus x-ray source is presently used to radiograph similar sized objects and line of site masses that are presently fielded in front of pRad. The Cygnus accelerators, located in the U1a drift at the Nevada Test Site (NTS), each drive a rod-pinch diode x-ray source which produce 4 Rad at 1-m from a ~1.0 mm diameter source [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Option study of an orthogonal X-ray radiography axis for pRad at LANSCE area C, Los Alamos.

Oliver¹,

Johnson²,

Leckbee³

et al. 2010

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We report on an option study of two potential x-ray systems for orthogonal radiography at Area C in the LANSCE facility at Los Alamos National Laboratory. The systems assessed are expected to be near equivalent systems to the presently existing Cygnus capability at the Nevada Test Site. Nominal dose and radiographic resolution of 4 rad (measured at one meter) and 1 mm spot are desired. Both a system study and qualitative design are presented as well as estimated cost and schedule. Each x-ray system analyzed is designed to drive a rod-pinch electron beam diode capable of producing the nominal dose and spot.

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Characterization of the rod-pinch diode x-ray source on Cygnus

Cited by 10 publications

References 8 publications

Positive-polarity rod-pinch experiments on the RITS-6 accelerator

Positive-polarity rod-pinch experiments on the RITS-6 accelerator

Shot-by-shot spectrum model for rod-pinch, pulsed radiography machines

Option study of an orthogonal X-ray radiography axis for pRad at LANSCE area C, Los Alamos.

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