Recent performance improvements on FXR

Kulke, B.; Kihara, R.

doi:10.2172/6241982

Cited by 4 publications

(4 citation statements)

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“…It began operations in 1982 with beam parameters of 2.2 kA at 17 MeV [74,75], and has since been upgraded to 3 kA at 18 MeV [76]. Although it is capable of double-pulse operation at a lower energy (8 MeV) [77,78], FXR is operated in the higherenergy single-pulse mode to provide a sufficient dose to penetrate the hydrotest.…”

Section: Fxrmentioning

confidence: 99%

Particle Beam Radiography

Peach

Ekdahl

2013

Rev. Accl. Sci. Tech.

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Particle beam radiography, which uses a variety of particle probes (neutrons, protons, electrons, gammas and potentially other particles) to study the structure of materials and objects noninvasively, is reviewed, largely from an accelerator perspective, although the use of cosmic rays (mainly muons but potentially also high-energy neutrinos) is briefly reviewed. Tomography is a form of radiography which uses multiple views to reconstruct a three-dimensional density map of an object. There is a very wide range of applications of radiography and tomography, from medicine to engineering and security, and advances in instrumentation, specifically the development of electronic detectors, allow rapid analysis of the resultant radiographs. Flash radiography is a diagnostic technique for large high-explosive-driven hydrodynamic experiments that is used at many laboratories. The bremsstrahlung radiation pulse from an intense relativistic electron beam incident onto a high-Z target is the source of these radiographs. The challenge is to provide radiation sources intense enough to penetrate hundreds of g/cm 2 of material, in pulses short enough to stop the motion of high-speed hydrodynamic shocks, and with source spots small enough to resolve fine details. The challenge has been met with a wide variety of accelerator technologies, including pulsed-power-driven diodes, air-core pulsed betatrons and high-current linear induction accelerators. Accelerator technology has also evolved to accommodate the experimenters' continuing quest for multiple images in time and space. Linear induction accelerators have had a major role in these advances, especially in providing multiple-time radiographs of the largest hydrodynamic experiments.

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Section: Fxrmentioning

confidence: 99%

Particle Beam Radiography

Peach

Ekdahl

2013

Rev. Accl. Sci. Tech.

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“…The Lawrence Livermore National Laboratory (LLNL) Flash X-Ray Radiography (FXR) machine [1] is a linear induction accelerator with a voltage output of 18MeV at a current of 3kA. The electron beam is focused onto a tantalum target to produce X-rays.…”

Section: A Overviewmentioning

confidence: 99%

Suppressing thermal energy drift in the LLNL Flash X-Ray accelerator using linear disk resistor stacks

Kreitzer

Houck

Luchterhand

2011

2011 IEEE Pulsed Power Conference

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“…1) at Lawrence Livermore National Laboratory (LLNL) is one of the few early [5] linear induction accelerators (LIAs) to still be in daily use at a working radiography user facility. To bring it's spatial resolution capabilities up to the standards of modern radiography LIAs such as DARHT and DARHT-II [6], FXR began an upgrade effort focused on the accelerator, pulsed power, and maintenance.…”

Section: Motivationmentioning

confidence: 99%

An improved SF6 system for the FXR induction linac blumlein switches

DeHope

Griffin

Kihara

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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The now-mature FXR (Flash X-Ray) radiographic facility at Lawrence Livermore National Laboratory will be briefly described with emphasis on its pulsed power system. The heart of each accelerating cell's pulseforming Blumlein is it's sulfur hexafluoride-based triggered closing switch. FXR's recent upgrade to a recirculating SF 6 gas reclamation system will be described and the resulting accelerator performance and reliability improvements documented. This was accompanied by a detailed switch breakdown study on FXR's Test Stand and the recent analysis of the resulting statistics will be shown.

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Recent performance improvements on FXR

Cited by 4 publications

References 0 publications

Particle Beam Radiography

Particle Beam Radiography

Suppressing thermal energy drift in the LLNL Flash X-Ray accelerator using linear disk resistor stacks

An improved SF6 system for the FXR induction linac blumlein switches

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