Analytical evaluation of surface barrier and resistance in iron-based superconducting multilayers for Superconducting Radio-Frequency applications

TL;DR

This paper evaluates iron-based superconducting multilayers for RF applications, comparing their magnetic and surface resistance properties to conventional superconductors to enhance particle accelerator performance.

Contribution

It provides an analytical comparison of IBS multilayers with traditional superconductors, highlighting their potential for improved RF resonator performance.

Findings

IBS multilayers can withstand higher magnetic fields than bulk niobium.

Surface resistance of IBS multilayers is comparable or lower than conventional superconductors.

Potential for higher operating temperatures in RF applications is discussed.

Abstract

New superconducting materials, particularly iron-based superconductors (IBS), have recently attracted attention for their potential applications in particle detectors and accelerators. This paper discusses the application of these materials in multilayer structures for radio-frequency resonators used to accelerate charged particles, with the aim of improving performance compared to bulk niobium. These materials are compared with previously studied multilayers composed of conventional superconductors in terms of the maximum magnetic field they can withstand, their surface resistance, and their power loss per unit surface area. Finally, perspectives and future applications aimed at increasing operating temperatures are discussed.