sci.physics.electromag

Szczepan Bialek wrote:
> "a_plutonium"
> >
> > As far as I know, the superconduction state occurs only in DC current.
>
> "If, on the other hand, the superconductor is to be used as an AC conductor,
> we must consider another effect, namely that the superconductor of type III
> shows a pronounced hysteresis for alternating currents above a certain
> magnitude. The hysteresis leads to losses which to the outside are
> manifested as ohmic losses dependent on the frequency and on the current.
> Although the superconductor type II does not show complete hysteresis, its
> magnetization curves do not coincide for a rising and a declining field, at
> least in a range between H c1 and H c2 . Therefore, the superconductor of
> type II also entails certain alternating current losses, though the losses
> are slight, compared to the superconductor of type III. The type I
> superconductor has even smaller alternating current losses. Despite this
> fact, superconductors of type II are used to conduct alternating current,
> since their slight alternating current losses are easily overcompensated by
> their relatively high current carrying capacity."
> It is from: http://www.freepatentsonline.com/3611078.html
> S*

Thanks that was a good reference and quoting a passage:
--- quoting from http://www.freepatentsonline.com/3611078.html


STABILIZED AC SUPERCONDUCTOR

Abstract:
Described is an AC superconductor, comprised of a superconducting
layer of
type I or II intended for the load current, which is placed with a
minimum contact
resistance upon a metallic stabilizing layer which during overloading
absorbs the
current at least partially and temporarily. The stabilizing layer is
comprised of a
superconducting material of type III.

(snipped)

At an alternating current of 50 Hz., the current-carrying limit of a
niobium
superconductor is a current whose magnetic field strength at the
conductor
surface amounts to approximately 1800 Oe (where Oe = Oersted). When
this field strength is exceeded by a certain current increase or due
to
additional outside fields, the superconductor becomes normal-
conducting.
--- end quoting ---

Normally I do not trust patents because simply alot of them are false,
but
I believe the above since Siemens was involved. And it points out that
type
1 and type 2 and type 3 superconductors seem to have different
meanings
than today's talk of Type I and Type II superconductors. The above
patent calls pure Nb as Type II and pure Pb as Type I whereas
technetium, Nb-Zr, Nb-Ti, Nb3Sn are called Type III.

Although this makes it more clear that superconductors can accomodate
both DC and AC currents it does not harm or damage my theory in the
least.
In fact, this news makes my theory even more stronger, for the fact
that
the above patent makes their material as a dielectric in a Capacitor
material.
By joining Type I and Type II and Type III to form a superconductor,
is the
formation of a dielectric Capacitor.

No harm to my theory because a Leyden jar can be charged by either a
DC current
or a AC current. And capacitors in general can be charged by either a
DC current
or a AC current.

Also I picked up a book today titled "Mechanisms of Conventional and
High Tc
Superconductivity" by Kresin, Morawitz, Wolf, 1993

And from pages 140 to 142 talks about AC current in high Tc
superconductor.

Today I got my Wimshurst generator up and running and will start
testing with
a magnet. What I hope to find is that a Leyden Jar has the possibility
of being
"perfect diamagnetic" and that the current generated by the Wimshurst
can
support a small magnet just as the superconductor displays the
Meissner
Effect.

What this book is all about is to trashcan the old and false theory of
BCS with
its silly Cooper pairings. And replace it with the true theory that
Superconductivity
is a different current than normal regular current. That
Superconductivity is
a Capacitor Current and it may or may not be aided by Microwires and
aided
by Electronegativity-Electropositivity.

Capacitor is the bulk of the theory, but whether there is more aiding
by Microwires
and by Electronegativity of a push and pull of electrons at cold
temperatures.

So the theory that is correct, according to this book is Capacitor
Current, but
since superconductivity is a broad and large phenomenon that more is
going on
than simply Capacitors and so I may have to inject Microwires and
Electronegativity.
Maybe I will not need Microwires and Electronegativity. Maybe
Capacitors and dielectrics
can handle the entire spectrum of superconduction.

Archimedes Plutonium
www.iw.net/~a_plutonium
whole entire Universe is just one big atom
where dots of the electron-dot-cloud are galaxies