From: utzoo!decvax!harpo!seismo!hao!hplabs!sri-unix!KING@KESTREL
Newsgroups: net.physics
Title: long superconductors
Article-I.D.: sri-unix.4923
Posted: Sat Dec 25 07:09:08 1982
Received: Mon Dec 27 03:11:48 1982

From: Richard M. King <KING at KESTREL>
	I claim that an extended superconductor (say, a cross-country power
cable) need only be refrigerated at one end.

	A superconductor conducts heat, as well as electricity, with no
resistance.  (There might be a time delay or a maximum flux due to the speed
of doublet motion or the number of doublets - I don't know.  It doesn't matter
to this argument.)  If you cool one end, at any time there will be a
superconducting portion and a normal portion.  The superconducting portion
will grow into the normal region if the refrigerator is more than powerful
enough to make up for heat infiltration over the superconducting length.

	I therefore claim that there need be no provision for liquid flow over
the length of the cable.

	Does anyone know if there is anything wrong with this argument?


						Dick
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