High-resolution 22–52 keV backlighter sources and application to X-ray radiography

Vaughan, K.; Moore, A. S.; Smalyuk, V. A.; Wallace, Katherine A.; Gate, D.; Glendinning, S. G.; McAlpin, S.; Park, H.S.; Sorce, C.; Stevenson, R. M.

doi:10.1016/j.hedp.2013.05.006

Cited by 13 publications

(4 citation statements)

References 12 publications

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“…According to Ref. [10], the enhanced local electric fields in the surface may account for the enhancement in this case. Therefore, it is suggested that the Laser-Nanowire (L-N) interaction is more beneficial for the projected radiography.…”

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confidence: 85%

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Radiography of a Kα X-ray source generated through ultrahigh picosecond laser–nanostructure target interaction

Wang¹,

Zhao²,

He³

et al. 2015

中国光学快报

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Laser-driven ultrafast X-ray sources are widely used for diagnostic radiography. However, there is a large divergence of fast electrons when they are generated by an intense short-pulse laser interacting with a foil target. We design a nanowire array target to achieve a more compact point X-ray source. Fast electrons are confined and guided by the nanowire array structure in order to generate a K α source with a small spot size. In our work, the smallest measured source size is comparable to the laser spot size, while the conversion efficiency can reach 2.4 × 10 −4. OCIS codes: 100.0100, 340.0340.

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confidence: 85%

“…Many special targets are proposed to control the spot size of the photons K α or K β emission by different groups over the world, such as a wire-like target or thin target viewed edge-on [8][9][10] . However, the laser-photon conversion efficiencies (CEs) of these sources are limited to 10 −5 .…”

mentioning

confidence: 99%

Radiography of a Kα X-ray source generated through ultrahigh picosecond laser–nanostructure target interaction

Wang¹,

Zhao²,

He³

et al. 2015

中国光学快报

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“…Short intense laser irradiated solid targets attract a lot of interest [4,5], which can generate bright picosecond hard x-ray sources with tens of microns size for Compton radiography. Laser driven Kα emission was used as the monoenergetic x-ray backlighter in some experiments of high energy density physics [6][7][8][9][10][11][12][13][14]. However, the conversion efficiency (CE) of the Kα x-ray source drops rapidly at hard xray ranges of >20 keV (typically CE ∼10 −5 -10 −4 ) [8].…”

Section: Introductionmentioning

confidence: 99%

Simulation of hard x-rays source produced by a picosecond laser irradiated solid target for Compton radiography

Huang

et al. 2020

Plasma Phys. Control. Fusion

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A bremsstrahlung radiation hard x-ray source, produced by a picosecond intense laser irradiated solid target, was used to diagnose an implosion capsule at stagnation phase via Compton radiography in experiments. By performing Monte Carlo and particle-in-cell simulation, we investigated the influence of target materials and laser intensity on the >70 keV bremsstrahlung hard x-ray emission. We found that the brightness of the hard x-rays is proportional to the atomic number multiplied by area density (ZρL), which indicates that the higher Z and higher density gold or uranium material will produce the brightest hard x-rays source at the same thickness. In relativistic laser solid interactions, hot electron recirculation plays an important role in hard x-ray emission. Without recirculation, hard x-ray conversion efficiency decays when increasing the laser intensity. While the hard x-ray emission comes to the maximal saturated conversion efficiency at relativistic laser intensity if considering the electron recirculation. These results provide valuable insights into the experimental design of Compton radiography.

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“…High intensity laser pulses rapidly ionize and accelerate electrons in laser-solid interactions, driving a multi-megaampere current of relativistic electrons into the target [1][2][3] . This electron current produces a bright source of bremsstrahlung radiation as it propagates, which has long been used as a source for radiography [4][5][6][7][8][9][10][11] and as a diagnostic for the internal electron current [12][13][14][15] . In contrast to conventional sources of X-ray radiation, laser-driven sources are able to deliver a broad (keV to tens of MeV) range of energies in a duration on the order of the laser pulse (∼ps) from a small (<100 µm) source [6,16] .…”

Section: Introductionmentioning

confidence: 99%

Bremsstrahlung emission from high power laser interactions with constrained targets for industrial radiography

Armstrong

Brenner

Jones

et al. 2019

High Pow Laser Sci Eng

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Laser–solid interactions are highly suited as a potential source of high energy X-rays for nondestructive imaging. A bright, energetic X-ray pulse can be driven from a small source, making it ideal for high resolution X-ray radiography. By limiting the lateral dimensions of the target we are able to confine the region over which X-rays are produced, enabling imaging with enhanced resolution and contrast. Using constrained targets we demonstrate experimentally a $(20\pm 3)~\unicode[STIX]{x03BC}\text{m}$ X-ray source, improving the image quality compared to unconstrained foil targets. Modelling demonstrates that a larger sheath field envelope around the perimeter of the constrained targets increases the proportion of electron current that recirculates through the target, driving a brighter source of X-rays.

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High-resolution 22–52 keV backlighter sources and application to X-ray radiography

Cited by 13 publications

References 12 publications

Radiography of a Kα X-ray source generated through ultrahigh picosecond laser–nanostructure target interaction

Radiography of a Kα X-ray source generated through ultrahigh picosecond laser–nanostructure target interaction

Simulation of hard x-rays source produced by a picosecond laser irradiated solid target for Compton radiography

Bremsstrahlung emission from high power laser interactions with constrained targets for industrial radiography

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