A large-scale magnetic shield with 10^6 damping at mHz frequencies

TL;DR

This paper introduces a groundbreaking large-scale magnetic shield achieving over a million-fold damping at millihertz frequencies, significantly advancing low-frequency magnetic noise suppression for high-precision physics experiments.

Contribution

The paper presents a novel design and realization of a magnetic shield with unprecedented damping performance at very low frequencies, surpassing previous state-of-the-art by over an order of magnitude.

Findings

Damping factor exceeds one million at mHz frequencies

Achieves extremely low magnetic field and gradient over large volume

Enables high-precision measurements for fundamental physics

Abstract

We present a magnetically shielded environment with a damping factor larger than one million at the mHz frequency regime and an extremely low field and gradient over an extended volume. This extraordinary shielding performance represents an improvement of the state of the art in damping the difficult regime of very low-frequency distortions by more than an order of magnitude. This technology enables a new generation of high precision measurements in fundamental physics and metrology, including searches for new physics far beyond the reach of accelerator-based experiments. We discuss the technical realization of the shield with its improvements in design.