Re: Superconducting tesla coil...

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: The MCP <ejkeever-at-comcast-dot-net> 

Heck, liquid nitrogen isn't *that* expensive, is it? But I'd want to be
careful that my components have similar thermal expansions. Use something
with a large theremal expansion coefficient as your winding on something that
doesn't, and you'll get broken/stretched wire as the wire shortens and tenses
up.

Other than that, you'll have to construct a vessel around the coil to contain
the LN2.

Reminds of an interesting reference from Ben Bova's Moonwar. They refer to the
mass driver as using "cryogenic aluminum" magnets rather than
supercondcucting magnets. When was the book written; The first high-temp
superconductor was created in the early 80's, right?

On Thursday 02 October 2003 10:27 am, Tesla list wrote:
 > Original poster: "Jim Lux" <jimlux-at-earthlink-dot-net>
 >
 > Rather than go total superconducting, why not try a simple and cheap
 > test... Even at LN2 temperatures, copper's resistance is much less than at
 > room temperature, albeit not superconducting.
 >
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Thursday, October 02, 2003 5:51 AM
 > Subject: Re: Superconducting tesla coil...
 >
 >  > Original poster: The MCP <ejkeever-at-comcast-dot-net>
 >  >
 >  > YBCO and BSCCO superconductors both work at liquid nitrogen
 >  > temperatures.
 >  >
 >  > The research team at this link
 >  > http://www.et.anl.gov/sections/ceramics/research/superconductor.html has
 >
 > been
 >
 >  > working with YBCO superconductors that, at liquid nitrogen temperature,
 >
 > can
 >
 >  > carry up to 600 amps per square millimeter. I seriously doubt that any
 >
 > tesla
 >
 >  > coil generates anything even remotely approaching that amperage. But you
 >  > never know...
 >  >
 >  > At any rate, I was thinking more about using super-fine gauge wire on a
 >  > gigantic form, putting tens of thousands of turns on it with no
 >  > resistance
 >
 > to
 >
 >  > reduce voltage gain, that using a normal number of turns and counting
 >
 > solely
 >
 >  > on the zero resistance. Plus, might all the self-capacitance with no
 >  > resistance stopping it up reduce the need for a topload?
 >  >
 >  > On Wednesday 01 October 2003 03:47 pm, Tesla list wrote:
 >  >  > Original poster: davep <davep-at-quik-dot-com>
 >  >  >
 >  >  > >>>I've seen two messages about this in the archives, from '98 and
 >  >  > >>> '95.
 >
 > I
 >
 >  >  > >>>was wondering if any progress has been made in this area?
 >  >  > >>>
 >  >  > >>>And what kind of improved step-up ratio could you expect in a
 >  >  > >>>superconducting vs normal coil?
 >  >  > >>
 >  >  > >>A superconducting coil, if it could built properly, would probably
 >  >  > >>give sparks that are about 8 to 10% longer.  No big difference
 >
 > really.
 >
 >  >  >          ...and require working with liquid nitrogen at best,
 >  >  >
 >  >  >          something colder, most likely...
 >  >  >
 >  >  >          ...and superconductors lose superconductivity in the
 >  >  >          presence of large magnetic fields, so there is a limit
 >  >  >          on currents/powers....
 >  >  >
 >  >  >          best
 >  >  >          dwp