Optics and bremsstrahlung estimates for channeling radiation experiments at FAST

TL;DR

This paper estimates the X-ray spectra from channeling radiation at the FAST facility, focusing on optimizing beam parameters and detector systems to produce high-brightness, quasi-monochromatic X-rays in the 40-110 keV range.

Contribution

It provides detailed simulations of beam optics and X-ray spectra for different bunch charges, including bremsstrahlung background estimates, to guide experimental setups at FAST.

Findings

Simulated X-ray spectra including bremsstrahlung background.

Optimized beam parameters for high brightness and yield.

Designed detector system to prevent pile-up effects.

Abstract

This paper presents X-ray spectra of channeling radiation (CR) expected at the FAST (Fermi Accelerator Science and Technology) facility in Fermilab. Our purpose is to produce high brightness quasi-monochromatic X-rays in an energy range from 40 keV to 110 keV. We will use a diamond crystal and low emittance electrons with an energy of around 43 MeV. The quality of emitted X-rays strongly depends on parameters of the electron beam at the crystal. We present simulations of the beam optics for high brightness and high yield operations with bunch charges of 1 pC, 20 pC, and 200 pC. We estimate the X-ray spectra including bremsstrahlung background for a charge of 20 pC. The electron beam distributions with and without channeling in the diamond crystal are calculated. We discuss an X-ray detector system to avoid pile-up effect during high charge operations.