Re: Fair Radio Sales HV cap---cool with liquid N2?

• To: tesla-at-pupman-dot-com
• Subject: Re: Fair Radio Sales HV cap---cool with liquid N2?
• From: Bryan Work <bryan-at-apexrad-dot-com> (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Wed, 30 Dec 1998 08:57:41 -0700
• Approved: twf-at-verinet-dot-com

Tesla List wrote:

> Original Poster: Doug Brunner <dabrunner-at-earthlink-dot-net>
>
> I'd like to be able to use one of these caps in my next coil, but I'm
> concerned about the dielectric heating. I had the idea of immersing it
> in liquid nitrogen. Do you think it would work?
>
> --
>            --Mr. Postman (Doug Brunner)
>                 <dabrunner-at-earthlink-dot-net>

  I think that it would be theoretically possible but impractical to use
anything so esoteric, unless you plan to use superconducting materials in
the system. How about using a refrigerant condenser as a cap chamber:
freon (or other more politically correct refrigerant) may better convect
any thermal accumulation.

X-ray tubes simply use oil baths to both control arc-over and provide
cooling. The high output versions have oil pumps and radiators with
blowers. Considering that 99% of the total power input is lost to heat on
150kW XRtube anode bombardment, this is probably adequate for most
puurposes.

Bryan Kaufman

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