Magnetic shielding

V. V. Yashchuk, S. K. Lee, E. Paperno

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

10 Scopus citations

Abstract

Introduction The ability to obtain well-characterized, stable magnetic field conditions independent of the Earth's magnetic field (~0.3–0.6 G) and environmental perturbations is the key to many urgent fundamental and applied investigations using high-precision magnetometry. State-of-the-art magnetometers operate with a sensitivity on the level of 1–10 × 10−12 G (see Chapters 4–10), whereas the amplitude spectrum of geomagnetic noise (see, for example, Ref. [1]) varies from about 0.2 G at 10−5 Hz (about a day observational period) to 2 × 10−8 G at 1 Hz (about a second observational period) with an approximately inverse-power-law (fractal-type) frequency dependence, scaled as f−1.4 [1]. In order to provide the required stability of the magnetic field, different techniques of magnetic shielding and stabilization have been brought into practice. Despite the considerable amount of literature on experiments vitally dependent on the efficacy of magnetic shielding, the details of the design of shielding systems and their performance are scarce and, until now, scattered among numerous publications. In this chapter, we review the physical principles of magnetic shielding and discuss design approaches, performance characterization, and the use of shielding systems. We begin in Section 12.2 with a discussion of fundamentals and basic approaches to designing and optimally using a ferromagnetic shield. Peculiarities of ferrite-based and superconducting shields are considered in Sections 12.3 and 12.4, respectively. Ferromagnetic shielding Depending on the frequency of external magnetic fields, ferromagnetic shielding occurs through different physical mechanisms.

Original languageEnglish
Title of host publicationOptical Magnetometry
PublisherCambridge University Press
Pages225-248
Number of pages24
Volume9781107010352
ISBN (Electronic)9780511846380
ISBN (Print)9781107010352
DOIs
StatePublished - 1 Jan 2011

ASJC Scopus subject areas

  • General Physics and Astronomy

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