Optimization of the Resolution of a Streaking Setup

TL;DR

This paper analytically estimates the effective resolution of a transverse deflecting structure (TDS) in low gamma regimes, determines the optimal streaking voltage, and discusses mitigation strategies to improve ultra-short bunch measurements.

Contribution

It introduces an analytical approach to estimate TDS resolution, benchmarks it with particle tracking, and explores mitigation techniques for realistic setups.

Findings

Analytical estimation of TDS resolution in low gamma regimes

Optimal streaking voltage for improved measurement accuracy

Mitigation scheme using downstream focusing element

Abstract

In low $\gamma$ regimes the inevitable induced energy spread in combination with longitudinal dispersion during the drift through a transverse deflecting structure (TDS) can alter the phase space of the particle bunch to be characterized. The consequential bunch lengthening can render measuring ultra-short bunches impossible, even for high available streaking powers and hence theoretical resolution. In this work the resulting effective resolution of a TDS is estimated analytically and the optimal streaking voltage is determined. The findings are subsequently benchmarked using matrix-based particle tracking. Furthermore, additional transverse, as well as other resolution limiting effects of a realistic streaking setup are discussed. A potential mitigation scheme using an additional downstream focusing element is evaluated.