An electron-beam based Compton scattering x-ray source for probing high-energy-density physics

TL;DR

This paper investigates the physics and design of an electron-beam based Compton scattering x-ray source capable of producing monoenergetic, high-flux x rays for high-energy-density physics experiments, with potential for single-shot applications.

Contribution

It provides a detailed analysis of the source physics, calculates photon yield and spectrum, and discusses design parameters for high-flux, monoenergetic x-ray production using existing technology.

Findings

Potential to generate over 10^10 photons in a 1-mm spot

Achieves 100-ps temporal resolution

Suitable for high-energy-density physics experiments

Abstract

The physics basis for an electron-beam based Compton scattering (ECOS) x-ray source is investigated for single-shot experiments at major high energy density facilities such as the Omega Laser Facility, National Ignition Facility, and Z pulsed power facility. A source of monoenergetic ($\delta\epsilon/\epsilon < 5\%$) 10- to 50-keV x rays can be produced by scattering of a short-pulse optical laser by a 23- to 53-MeV electron beam and collimating the scattered photons. The number and spectrum of scattered photons is calculated as a function of electron packet charge, electron and laser pulse duration, laser intensity, and collision geometry. A source with greater than 10$^{10}$ photons in a 1-mm radius spot at the OMEGA target chamber center and 100-ps time resolution is plausible with the available electron gun and laser technology. Design requirements for diffraction, inelastic scattering and imaging experiments as well as opportunities for improved performance are discussed.