Comparative Wakefield Analysis of a First Prototype of a DDS Structure for CLIC Main Linac

TL;DR

This paper presents a comprehensive simulation-based analysis of wakefields and impedances in a prototype Damped Detuned Structure for CLIC, aiming to improve wakefield suppression and high power performance in linear accelerators.

Contribution

It provides the first detailed electromagnetic simulation study of the full DDS prototype, informing design parameters for effective wakefield suppression.

Findings

Wakefield and impedance characteristics of the prototype are characterized.

Simulation results guide the design of HOM couplers.

Full structure analysis improves understanding of wakefield suppression mechanisms.

Abstract

A Damped Detuned Structure (DDS) for CLIC main linac has been proposed as an alternative to the present baseline design which is based on heavy damping. A first prototype, CLIC_DDS_A, for high power tests has been already designed and is under construction. It is also foreseen to design a further prototype, CLIC_DDS_B, to test both the wakefield suppression and high power performances. Wakefield calculations for DDS are, in the early design stage, based on single infinitely periodic cells. Though cell-to-cell interaction is taken into account to calculate the wakefields, it is important to study full structure properties using computational tools. In particular this is fundamental for defining the input parameters for the HOM coupler that is crucial for the performances of DDS. In the following a full analysis of wakefields and impedances based on simulations conducted with finite difference based electromagnetic computer code GdfidL will be presented.