Superconducting bowl shield with the optional layer of mu-metal - QuickField simulation example
This is a simulation example of the superconducting bowl shield in the uniform external magnetic field. Example is prepared by Professor James R. Claycomb as a part of the webinar QuickField for Electromagnetic Shielding Applications.
How to find magnetic shielding with superconducting bowl shield?
Answer Typical applications Geometry
D = 32 cm, t1 = 1 cm, t2 = 1 cm
Given
Problem: Solution
Results
Magnetic field strength distribution in case of the superconducting bowl shield covered with the mu-metal layer
Engineering question
Set up an axisymmetric QuickField DC Magnetics problem for a superconducting bowl shield with mu-metal and evaluate magnetic shielding from computed field results.
superconducting magnetic shields, mu-metal shield layers, low-field shielding systems
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Simulation problem
Problem Type
Axisymmetric problem of DC magnetics.
Relative magnetic permeability of mu-metal μ = 10000,
External field B = 277 mT.
Determine the shielding factor for the single layer superconducting bowl shield and for the bowl covered with the second layer of mu-metal.
Uniform external magnetic field was defined by assigning a non-zero vector magnetic potential distribution on the simulation area boundary.
Magnetic field strength distribution in case of the single layered superconducting bowl shield.
Superconducting bowl shield
Magnetic flux density
5 cm away from the bowl bottom
Single layered
7.5 mT (2.7%)
With additional mu-metal layer
9.7 mT (3.5%)
Video
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