Time-resolved Measurement of Quadrupole Wakefields in Corrugated Structures

TL;DR

This paper presents time-resolved measurements of quadrupole wakefields in corrugated structures, demonstrating their impact on beam emittance and how they can be canceled with orthogonal structures, aligning with theoretical predictions.

Contribution

It provides the first time-resolved measurements of quadrupole wakefields in planar corrugated structures and confirms their behavior matches theoretical models.

Findings

Quadrupole wakefields cause beam emittance growth.

Orthogonal corrugated structures can cancel quadrupole wakefields.

Measured wakefield strengths agree with theory.

Abstract

Corrugated structures have recently been widely used for manipulating electron beam longitudinal phase space and for producing THz radiation. Here we report on time-resolved measurements of the quadrupole wakefields in planar corrugated structures. It is shown that while the time- dependent quadrupole wakefield produced by a planar corrugated structure causes significant growth in beam transverse emittance, it can be effectively canceled with a second corrugated structure with orthogonal orientation. The strengths of the time-dependent quadrupole wakefields for various corrugated structure gaps are also measured and found to be in good agreement with theories. Our work should forward the applications of corrugated structures in many accelerator based scientific facilities.