Physics – Instrumentation and Detectors
Scientific paper
2007-09-17
Physics
Instrumentation and Detectors
10 pages
Scientific paper
10.1063/1.2885711
High-permeability magnetic shields generate magnetic field noise that can limit the sensitivity of modern precision measurements. We show that calculations based on the fluctuation-dissipation theorem allow quantitative evaluation of magnetic field noise, either from current or magnetization fluctuations, inside enclosures made of high-permeability materials. Explicit analytical formulas for the noise are derived for a few axially symmetric geometries, which are compared with results of numerical finite element analysis. Comparison is made between noises caused by current and magnetization fluctuations inside a high-permeability shield and also between current-fluctuation-induced noises inside magnetic and non-magnetic conducting shells. A simple model is suggested to predict power-law decay of noise spectra beyond quasi-static regime. Our results can be used to assess noise from existing shields and to guide design of new shields for precision measurements.
Lee Samuel K.
Romalis Michael V.
No associations
LandOfFree
Calculation of Magnetic Field Noise from High-Permeability Magnetic Shields and Conducting Objects with Simple Geometry does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Calculation of Magnetic Field Noise from High-Permeability Magnetic Shields and Conducting Objects with Simple Geometry, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Calculation of Magnetic Field Noise from High-Permeability Magnetic Shields and Conducting Objects with Simple Geometry will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-378323