Re: superconducting coil (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Tue, 26 Jun 2007 13:08:29 -0500
From: Drake Schutt <drake89@xxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: superconducting coil (fwd)

Interesting- I thought that it might yield some interesting results and cost
was the only thing keeping someone from doing it.  Looks like I was wrong
but I did learn something.

drake

On 6/26/07, Tesla list <tesla@xxxxxxxxxx> wrote:
>
>
> ---------- Forwarded message ----------
> Date: Tue, 26 Jun 2007 12:12:24 -0400
> From: Dave Pierson <davep@xxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: superconducting coil (fwd)
>
>
> >>So I was searching through the archives and never really found an answer
> to
> >>my question.  Say you have unlimited funding and built a solid state
> coil,
> >>winding the primary and secondary coils with something like YBCO or some
> >>other high temperature superconductor.  I don't believe anyone has every
> >>done this, but what would you expect to be different about this coil
> than
> >>say a regular Cu wound coil?  What kind of efficiency are we looking at
> >>here?  Would it have any weird or 'mystical' properties not found in
> regular
> >>coils?
>
> >    I never saw an answer to this posted here.  The answer is no, the
> >performance couldn't be much different from that of a coil wound with
> >dopper.  Copper loss in the secondary is so much less than the power
> >lost in streamers that once they formed almost all the power would be
> >dissipated in them as usual.
>      I would certainly agree, to a point.
>      However it rather depends on the 'purpose' of the coil/system.
>      There are theories which, if i read Tesla correctly, would have
>      the coil operating 'below breakout'.  [To be fair: I, personally,
>      think such operation would not accomplish anything practical,
>      however, 'below breakout' does seem to have been one mode Tesla
>      pondered.)
>
>      My speculation, is that, even so, the losses in conventional
>      coils, in the copils proper, are SO low, even withnormal conductors,
>      as to have minimal effect.  The shift to superconducting coils
>      involves running 'a lot of stuff' at Liquid Hydrogen, or, at
>      best, liquid nitrogen temps.  Also: Superconductors have a
>      phenomenon called 'quench':  If the mag field (accompanying
>      the passage of current) goes to high, they STOP superconducting.
>      Solvable, however another complication.
>
>      best
>       dwp
>
>
>
>