Efficiency Enhancement for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>K</mml:mi><mml:mi>α</mml:mi></mml:msub></mml:math>X-Ray Yields from Laser-Driven Relativistic Electrons in Solids

Sefkow, A. B.; Bennett, G. R.; Geißel, Matthias; Schollmeier, M.; Franke, Brian Claude; Atherton, Briggs W.

doi:10.1103/physrevlett.106.235002

Cited by 27 publications

(15 citation statements)

References 38 publications

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“…Numerous simulations have exploited the TOR to accelerate ions 7-10 , shape intense laser pulses [11][12][13][14][15] and produce X-rays [16][17][18][19] with unique characteristics. However, so far, clear observation 1 Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA, 2 Ludwig-Maximilan-Universität, München, D-85748 Garching, Germany, 3 Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany, 4 Centre for Plasma Physics, Department of Physics and Astronomy, Queens University Belfast BT7 1NN, UK.…”

mentioning

confidence: 99%

Dynamics of relativistic transparency and optical shuttering in expanding overdense plasmas

et al. 2012

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Overdense plasmas are usually opaque to laser light. However, when the light is of sufficient intensity to drive electrons in the plasma to near light speeds, the plasma becomes transparent. This process-known as relativistic transparency-takes just a tenth of a picosecond. Yet all studies of relativistic transparency so far have been restricted to measurements collected over timescales much longer than this, limiting our understanding of the dynamics of this process. Here we present time-resolved electric field measurements (with a temporal resolution of ∼50 fs) of the light, initially reflected from, and subsequently transmitted through, an expanding overdense plasma. Our result provides insight into the dynamics of the transparent-overdense regime of relativistic plasmas, which should be useful in the development of laser-driven particle accelerators, X-ray sources and techniques for controlling the shape and contrast of intense laser pulses.

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confidence: 99%

Dynamics of relativistic transparency and optical shuttering in expanding overdense plasmas

et al. 2012

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“…Laboratory creation of matter in the ultrahigh-energy density (UHED) regime is of great interest for the realization of inertial confinement fusion (1,2), to further the understanding of atomic processes in astrophysical and extreme laboratory environments (3)(4)(5), and to generate intense sources of x-rays and high-energy particles (6,7). However, the creation of matter in this regime in the laboratory has been limited to the central hot spot of the spherically imploded capsule in inertial confinement fusion experiments conducted using the world's highestenergy lasers (8,9).…”

Section: Introductionmentioning

confidence: 99%

Energy Penetration into Arrays of Aligned Nanowires Irradiated with Relativistic Intensities: Scaling to Terabar Pressures

Bargsten

Hollinger

Capeluto

et al. 2016

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Ultrahigh-energy density (UHED) matter, characterized by energy densities >1 × 10 8 J cm −3 and pressures greater than a gigabar, is encountered in the center of stars and inertial confinement fusion capsules driven by the world's largest lasers. Similar conditions can be obtained with compact, ultrahigh contrast, femtosecond lasers focused to relativistic intensities onto targets composed of aligned nanowire arrays. We report the measurement of the key physical process in determining the energy density deposited in high-aspect-ratio nanowire array plasmas: the energy penetration. By monitoring the x-ray emission from buried Co tracer segments in Ni nanowire arrays irradiated at an intensity of 4 × 10 19 W cm, we demonstrate energy penetration depths of several micrometers, leading to UHED plasmas of that size. Relativistic three-dimensional particle-in-cell simulations, validated by these measurements, predict that irradiation of nanostructures at intensities of >1 × 10 22 W cm −2 will lead to a virtually unexplored extreme UHED plasma regime characterized by energy densities in excess of 8 × 10 10 J cm −3

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“…These new mechanisms are predicted to result in >100 MeV to GeV proton and heavy ion beams, which, if successfully generated, might be used to perform an ion radiography experiment at Z within a 15 year time frame. In the nearer future, within 5 to 10 years, an improved laser contrast is required to test a novel K α x-ray generation mechanism based on volume acceleration of a thin target foil [110], as well as to generate an intense, directed fast neutron beam [111,112]. A directed neutron beam could be used to probe very dense samples at Z via neutron imaging or scattering, as well as to better characterize neutron diagnostics for Z.…”

Section: Discussionmentioning

confidence: 99%

Z-petawatt driven ion beam radiography development.

Schollmeier¹,

Geißel²,

Rambo³

et al. 2013

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Laser-driven proton radiography provides electromagnetic field mapping with high spatiotemporal resolution, and has been applied to many laser-driven High Energy Density Physics (HEDP) experiments. Our report addresses key questions about the feasibility of ion radiography at the Z-Accelerator ("Z"), concerning laser configuration, hardware, and radiation background. Charged particle tracking revealed that radiography at Z requires GeV scale protons, which is out of reach for existing and near-future laser systems. However, it might be possible to perform proton deflectometry to detect magnetic flux compression in the fringe field region of a magnetized liner inertial fusion experiment. Experiments with the Z-Petawatt laser to enhance proton yield and energy showed an unexpected scaling with target thickness. Full-scale, 3D radiation-hydrodynamics simulations, coupled to fully explicit and kinetic 2D particle-in-cell simulations running for over 10 ps, explain the scaling by a complex interplay of laser prepulse, preplasma, and ps-scale temporal rising edge of the laser.4

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Efficiency Enhancement forKαX-Ray Yields from Laser-Driven Relativistic Electrons in Solids

Cited by 27 publications

References 38 publications

Dynamics of relativistic transparency and optical shuttering in expanding overdense plasmas

Dynamics of relativistic transparency and optical shuttering in expanding overdense plasmas

Energy Penetration into Arrays of Aligned Nanowires Irradiated with Relativistic Intensities: Scaling to Terabar Pressures

Z-petawatt driven ion beam radiography development.

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