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Ultrabroad-band X-Ray Source Using a Picosecond, Laser-Driven Plasma Accelerator

N. Lemos,P. M. King,D. Rusby, I. Pagano,M. Sinclair, K. A. Marsh,J. L. Shaw,A. L. Milder,A. Pak,B. B. Pollock,M. Aufderheide,F. Hartemann, S. Q. Wu, Y. Hwang,B. M. Hegelich, J. Moody, P. Michel, C. Joshi,F. Albert

PHYSICAL REVIEW RESEARCH(2024)

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摘要
An ultrabroad-band x-ray source, with photon energies from 10 keV to >1 MeV, based on a picosecond laser-driven plasma accelerator, is characterized and used to radiograph high-energy-density-science relevant targets. The measured yield of 10^{12} photons/shot is reaching the necessary photon yields to radiograph, in a single shot, high areal density objects and matter under extreme conditions. By focusing a short laser pulse (120 J, 1 ps) into a gas jet, a <100 mrad electron beam with energies up to 350 MeV and up to 70 nC of charge was produced by a combination of laser self-modulation instability and direct laser acceleration. A foil placed at the exit of the gas jet is used to convert part of the electron beam energy into x rays through inverse bremsstrahlung and/or inverse Compton scattering, generating a bright, broad-band, high-photon-energy beam. This beam is used to radiograph a gold half hohlraum with a high-density sphere inside with relevant characteristics for high-energy-density science and inertial confinement fusion.
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