Re: Holed SRSG disc ..was First light at 4500VA

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

Original poster: "robert heidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-desertgate-dot-com>

Scott D: I like your presentation. Let me give a small input. The SG
temprature runs in the area ot 4000oC and metal conductors turn to gas that
coats the ceramic causing it to become conductive. Alumina and Beryla are
used in similar applications. Beryla is used because it is thermaly
conductive and the heat can be conducted away from the high heat site where
Alumina is not thermaly conducive and heat builds up. Flourine and Chlorine
compounds ( C Cl 4) are added to shark gap systems to quench the spark for
faster responce. NOTE: Toxic is the rule not the exception.
    Robert  H

 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > Date: Thu, 14 Nov 2002 08:02:07 -0700
 > To: tesla-at-pupman-dot-com
 > Subject: Re: Holed SRSG disc ..was First light at 4500VA
 > Resent-From: tesla-at-pupman-dot-com
 > Resent-Date: Thu, 14 Nov 2002 08:05:54 -0700
 >
 > Original poster: "BunnyKiller by way of Terry Fritz <twftesla-at-qwest-dot-net>"
 > <bigfoo39-at-telocity-dot-com>
 >
 > As with any learning experience in T coiling we all come up with wonderful
 > ideas to try to improve on the current designs....I say this is good , at
 > least the "learners" are thinking :)
 >
 > as far as SRSG's with holes in the disc instead of metallic conductors is a
 > good idea IF we can find a material that can withstand the heat of the arc
 > created by the gap. As mentioned in previous posts, ceramic would be a good
 > material to use. But due to its fragile nature, it is prone to fracturing
 > easily. One type of ceramic used in extreme hi heat conditions is Berillium
 > ( spelling? ) Oxide. It is commonly used in gas lasers ( argon, krypton)
 > which produce ungodly amounts of heat for the size of containment.  Dont
 > get too excited yet....  BeO is toxic... very brittle... and has to be cast
 > or molded, forget about drilling and or machining this stuff...  ( I
 > already tried ..  trashed a very expensive TiN coated Tungsten Carbide
 > drill bit in an attempt to drill a laser tube) .
 >
 > The problem we face is the extreme amount of heat, the electron flow (
 > which shreds just about everything, which results in heat) , the lack of
 > materials that have a insulative value required to keep the spark supressed.
 >
 > An idea....   complicated, expensive,  but an idea...  since heat is our
 > main problem what about supercooling the disc. Use a gas that is semi
 > conductive and cold ( nitrogen?? hmmm bad choice LOTS of UV and NO, inert
 > gasses wont quench... fluids will eventually heat up and breakdown and
 > cavitate, besides... a 5 hp motor will be needed to rotate the disc. There
 > is some type of flourine gas compound already used in spark gaps but purity
 > is a paramount factor in its operation...  not too many of us have access
 > to such resorces...
 >
 > Sooo...  I suppose we are stuck with our SRSG woes until we can easily
 > afford a laser powered pulsed preionizer or the semiconductor companies
 > come up with a solid state device that can withstand up to 100KV hold off
 > potentials which can operate at 5000 KHz.
 >
 >
 > there has got to be an affordable answer somewhere........
 >
 >
 > Scot D
 >
 >
 >
 >
 >