Wakefield damping for the CLIC crab cavity

TL;DR

This paper investigates wakefield issues in the CLIC crab cavity and explores damping schemes to suppress them, aiming to improve collision efficiency in high-frequency accelerator environments.

Contribution

It provides an analysis of wakefield characteristics in the CLIC crab cavity and evaluates various damping methods for effective wake suppression.

Findings

High damping is necessary for wakefield suppression in CLIC crab cavities.

Different damping schemes vary in effectiveness and practicality.

Effective damping improves luminosity and collision quality.

Abstract

A crab cavity is required in the CLIC to allow effective head-on collision of bunches at the IP. A high operating frequency is preferred as the deflection voltage required for a given rotation angle and the RF phase tolerance for a crab cavity are inversely proportional to the operating frequency. The short bunch spacing of the CLIC scheme and the high sensitivity of the crab cavity to dipole kicks demand very high damping of the inter-bunch wakes, the major contributor to the luminosity loss of colliding bunches. This paper investigates the nature of the wakefields in the CLIC crab cavity and the possibility of using various damping schemes to suppress them effectively.