Modeling Betatron Radiation Diagnostics for E-310 -- Trojan Horse

TL;DR

This paper discusses models for betatron radiation diagnostics in the E-310 plasma accelerator experiment, comparing three simulation approaches to improve beam diagnostics using betatron radiation spectra.

Contribution

It introduces and compares three different models for simulating betatron radiation, enhancing understanding and diagnostic capabilities for plasma-based high-brightness beam experiments.

Findings

Spectra from three models show good agreement in simple cases.

The spectrometer enables single-shot, nondestructive beam diagnostics.

Model comparisons inform better interpretation of betatron radiation data.

Abstract

The E-310 experiment at the Facility for Advanced Accelerator Experimental Tests II (FACET-II) at SLAC National Accelerator Laboratory aims to demonstrate the creation of high brightness beams from a plasma photocathode. Betatron radiation will be measured by a Compton spectrometer, currently under development at UCLA, to provide single-shot, nondestructive beam diagnostics. We give a brief overview of this spectrometer as well as double differential spectrum reconstruction from the spectrometer image and beam parameter reconstruction from this double differential spectrum. We discuss three models for betatron radiation: an idealized particle tracking code which computes radiation from Li\'enard-Wiechert potentials, a quasi-static particle-in-cell (PIC) code which computes radiation from Li\'enard-Wiechert potentials, and a full PIC code which computes radiation using a Monte Carlo QED method. Spectra computed by the three models for a simple case are compared.