Numerical analysis of a folded superconducting coaxial shield for cryogenic current comparators

TL;DR

This paper introduces a novel folded coaxial shield design for cryogenic current comparators, providing an analytical model validated by simulations, and compares its performance to traditional ring shields used in particle accelerators.

Contribution

It presents a new shield configuration and an analytical model for its performance, enhancing understanding and potential application in cryogenic current measurement devices.

Findings

The folded coaxial shield's performance is effectively modeled analytically.

Finite element simulations validate the analytical model.

The new shield shows improved volumetric performance over traditional ring shields.

Abstract

This paper presents a new shield configuration for cryogenic current comparators (CCCs), namely the folded coaxial geometry. An analytical model describing its shielding performance is first developed, and then validated by means of finite element simulations. Thanks to this model, the fundamental properties of the new shield are highlighted. Additionally, this paper compares the volumetric performance of the folded coaxial shield to the one of a ring shield, the latter being installed in many CCCs for measuring particle beam currents in accelerator facilities.