High Gradient Superconducting Cavity with Low Surface EM Fields and Well-Suppressed HOMS for the ILC

TL;DR

This paper introduces the NLSF superconducting cavity design that minimizes surface electromagnetic fields, maximizes fundamental mode bandwidth, and effectively manages higher order modes for improved accelerator performance.

Contribution

The paper presents a novel cavity geometry with optimized electromagnetic properties and a two-band circuit model for efficient HOM analysis, advancing superconducting cavity design.

Findings

Reduced surface electromagnetic fields in the NLSF cavity

Enhanced fundamental mode bandwidth

Effective damping of higher order modes

Abstract

We present an optimized geometry for a 1.3 GHz superconducting cavity in which the surface electromagnetic fields have been minimized and the bandwidth of the fundamental mode has been maximized. We refer to this design as the New Low Surface Field (NLSF) cavity. Earlier work focused on properties of the fundamental mode. Here we additionally study higher order modes (HOMs), means of damping them, and short range wake fields. A two-band circuit model is employed in order to facilitate rapid characterization of cavity HOMs.