A magnetically shielded room with ultra low residual field and gradient

I. Altarev, E. Babcock, D. Beck, M. Burghoff, S. Chesnevskaya, T. Chupp, S. Degenkolb, I. Fan, P. Fierlinger, A. Frei, E. Gutsmiedl, S. Knappe-Grüneberg, F. Kuchler, T. Lauer, P. Link, T. Lins, M. Marino, J. McAndrew, B. Niessen, S. PaulG. Petzoldt, U. Schläpfer, A. Schnabel, S. Sharma, J. Singh, R. Stoepler, S. Stuiber, M. Sturm, B. Taubenheim, L. Trahms, J. Voigt, T. Zechlau

Research output: Contribution to journalArticlepeer-review


A versatile and portable magnetically shielded room with a field of (700 ± 200) pT within a central volume of 1 m × 1 m × 1 m and a field gradient less than 300 pT/m, achieved without any external field stabilization or compensation, is described. This performance represents more than a hundredfold improvement of the state of the art for a two-layer magnetic shield and provides an environment suitable for a next generation of precision experiments in fundamental physics at low energies; in particular, searches for electric dipole moments of fundamental systems and tests of Lorentz-invariance based on spin-precession experiments. Studies of the residual fields and their sources enable improved design of future ultra-low gradient environments and experimental apparatus. This has implications for developments of magnetometry beyond the femto-Tesla scale in, for example, biomagnetism, geosciences, and security applications and in general low-field nuclear magnetic resonance (NMR) measurements.

Original languageEnglish (US)
Article number075106
JournalReview of Scientific Instruments
Issue number7
StatePublished - Jul 2014

ASJC Scopus subject areas

  • Instrumentation


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