Characterisation of a MeV Bremsstrahlung x-ray source produced from a high intensity laser for high areal density object radiography

Courtois, Christian; Edwards, R. J.; Fontaine, Antoine; Aedy, C.; Bazzoli, S.; Bourgade, J. L.; Gazave, J.; Lagrange, J.M.; Landoas, O.; Dain, L. Le; Mastrosimone, D.; Pichoff, N.; Pien, G.; Stoeckl, C.

doi:10.1063/1.4818505

Cited by 62 publications

(37 citation statements)

References 34 publications

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“…The Bremsstrahlung radiation for high areal density object radiography has been extended into the MeV region with intense short ( ps) pulse lasers. These are particularly useful for the study of high- materials such as gold or copper where classical K- backlighters would not have sufficient brightness or energy [172, 173] . An alternative approach to X-ray radiography using broadband x-pinch sources based on pulsed-power technology has also been utilized primarily at z-pinch facilities [174] .…”

Section: Experimental Techniquesmentioning

confidence: 99%

Experimental methods for warm dense matter research

Falk

2018

High Pow Laser Sci Eng

109

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The study of structure, thermodynamic state, equation of state (EOS) and transport properties of warm dense matter (WDM) has become one of the key aspects of laboratory astrophysics. This field has demonstrated its importance not only concerning the internal structure of planets, but also other astrophysical bodies such as brown dwarfs, crusts of old stars or white dwarf stars. There has been a rapid increase in interest and activity in this field over the last two decades owing to many technological advances including not only the commissioning of high energy optical laser systems, z-pinches and X-ray free electron lasers, but also short-pulse laser facilities capable of generation of novel particle and X-ray sources. Many new diagnostic methods have been developed recently to study WDM in its full complexity. Even ultrafast nonequilibrium dynamics has been accessed for the first time thanks to subpicosecond laser pulses achieved at new facilities. Recent years saw a number of major discoveries with direct implications to astrophysics such as the formation of diamond at pressures relevant to interiors of frozen giant planets like Neptune, metallic hydrogen under conditions such as those found inside Jupiter’s dynamo or formation of lonsdaleite crystals under extreme pressures during asteroid impacts on celestial bodies. This paper provides a broad review of the most recent experimental work carried out in this field with a special focus on the methods used. All typical schemes used to produce WDM are discussed in detail. Most of the diagnostic techniques recently established to probe WDM are also described. This paper also provides an overview of the most prominent examples of these methods used in experiments. Even though the main emphasis of the publication is experimental work focused on laboratory astrophysics primarily at laser facilities, a brief outline of other methods such as dynamic compression with z-pinches and static compression using diamond anvil cells (DAC) is also included. Some relevant theoretical and computational efforts related to WDM and astrophysics are mentioned in this review.

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Section: Experimental Techniquesmentioning

confidence: 99%

Experimental methods for warm dense matter research

Falk

2018

High Pow Laser Sci Eng

109

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“…From Ben-Ismail et al [167] (d) CAD section view of another similar, 20 mm diameter test object, and radiography images, obtained with bremsstrahlung from direct laser-solid interaction through (e) 66 g/cm 2 , (f ) 102 g/cm 2 , and (g) 85 g/cm 2 areal densities. From Courtois et al [211] using a driver for the electron beam and a scattering beam, the X-ray source size was measured to be 5 µm using a cross-correlation technique in which the scattering pulse is scanned. In addition, the narrow divergence of the beam is well suited for long standoff imaging.…”

Section: Military Defense and Industrial Applications 41 High Resolmentioning

confidence: 99%

Applications of laser wakefield accelerator-based light sources

Albert

Thomas

2016

Plasma Phys. Control. Fusion

261

132

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Laser-wakefield accelerators (LWFAs) were proposed more than three decades ago, and while they promise to deliver compact, high energy particle accelerators, they will also provide the scientific community with novel light sources. In a LWFA, where an intense laser pulse focused onto a plasma forms an electromagnetic wave in its wake, electrons can be trapped and are now routinely accelerated to GeV energies. From terahertz radiation to gamma-rays, this article reviews light sources from relativistic electrons produced by LWFAs, and discusses their potential applications. Betatron motion, Compton scattering and undulators respectively produce X-rays or gamma-rays by oscillating relativistic electrons in the wakefield behind the laser pulse, a counterpropagating laser field, or a magnetic undulator. Other LWFA-based light sources include bremsstrahlung and terahertz radiation. We first evaluate the performance of each of these light sources, and compare them with more conventional approaches, including radio frequency accelerators or other laser-driven sources. We have then identified applications, which we discuss in details, in a broad range of fields: medical and biological applications, military, defense and industrial applications, and condensed matter and high energy density science.

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“…Using laser-driven X-ray sources as a backlighter in inertial confinement fusion has also been an area of study, where experimental investigations have demonstrated a bright emission with the side profile of the target as the source [16, 21–23] . While this technique has achieved a source size of , the flux of X-rays emitted from the target edge is lower than on laser axis and target normal [24, 25] . Bremsstrahlung sources of have been demonstrated during laser-wakefield experiments using a bremsstrahlung converter positioned after the laser–gas interaction [26] .…”

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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Characterisation of a MeV Bremsstrahlung x-ray source produced from a high intensity laser for high areal density object radiography

Cited by 62 publications

References 34 publications

Experimental methods for warm dense matter research

Experimental methods for warm dense matter research

Applications of laser wakefield accelerator-based light sources

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

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