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# Re: [femm] Superconductor model

- To: <femm@yahoogroups.com>
- Subject: Re: [femm] Superconductor model
- From: Peter Schönhuber <Peter.Schoenhuber@tuwien.ac.at>
- Date: Wed, 9 May 2001 09:25:09 +0200
- References: <9d98sk+kn65@eGroups.com> <3AF86717.B8EC1C60@foster-miller.com>

    The equivalency of perfect conducting and superconducting material might be
    a good starting point, although the physics behind is somewhat different
    (look at the frequency behavior of both materials!).

    Moreover, please keep in mind that identifying a material with a constant
    permeability (whatever value) makes the assumption of homogeneity, linearity
    and isotropy. Probably this is just a (very) rough approximation of a
    real-world Type I - Superconductor. You won´t be able to model a Type II
    Superconductor (high Tc stuff and all that) at all!

    Best regards,

    Peter Schönhuber

    ----- Original Message -----
    From: "David Meeker" <dmeeker@foster-miller.com>
    To: <femm@yahoogroups.com>
    Sent: Tuesday, May 08, 2001 11:37 PM
    Subject: Re: [femm] Superconductor model

    Vencislav wrote:

    > Hello,
    >
    > this is my first question in this group:
    >
    > how do I make a model of superconductor in femm?
    >
    > I'm trying to see how will magnetic field behave
    > when there is superconductor, since we know that
    > superconductors do not let magnetic field lines
    > go through it.
    >

    The easiest way to model a region filled with a perfect conductor is just to
    assign it an extremely low permeability. You can't assign a region a
    permeability that is exactly zero, because the problem would be too badly
    conditioned to solve. But that's ok--assigning a relative permeability of
    0.001 excludes flux nicely and generally solves ok.

    Somebody even got a paper out of this technique once. If you are
    interested,
    you can check out:
    A. Konrad and M. Graovac, "The finite element modeling of conductors and
    floating potentials," IEEE Transactions on Magnetics, 32(5):4329-4311, Sept.
    1996.

    Dave Meeker

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- References:
  - Superconductor model
    - From: "Vencislav" <vencib@yahoo.com>
  - Re: [femm] Superconductor model
    - From: David Meeker <dmeeker@foster-miller.com>

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