RE: CAP DESIGN
* Original msg to: Kukkonen-at-snakemail.hut.fi
>On Sat, 14 Jan 1995, Richard Quick wrote:
Ku> About di-electric plates for a cap..
RQ> the defects will probably not be apparent if the power supply is
RQ> rated for 10 kV. If you never intend to place a higher voltage
RQ> transformer across it you should be just fine.
Ku> It appears that I shall have to use 8kV 105mA for running the
Ku> system so the voltage-rating is more than enough.. and the
Ku> x-former oil should fill the dents anyway if they don't get
Ku> fixed as I press the plates together..
RQ> but in these caps a little moisture will not hurt much. You can
RQ> pour the oil over dessicant in the filter paper if you are
RQ> concerned, it will reduce the water content quite a bit.
Ku> ..and by leaving a little "empty" space to the bottom of the
Ku> tank between the bottom-plate and the cap-plates - the water
Ku> should gather there because of density-differencies..
That has been my experience.
Ku> btw: I do now have the electrodes ready for the airblast-spark.gap.
Ku> They are not of brass but bronze - I guess that is does not matter
Ku> as the m.p. is higher.. Kristian Ukkonen.
I like brass because it is available here (whereas bronze in not) and
it has a lower ionization factor than pure copper or tin. Bronze is an
alloy of copper and tin, but and I have not done any research on the
ionization factor. I do know that pure zinc is preferable over pure
tin, and I have used pure zinc electrodes.
Not to worry though. A good gap is a combination of design and material.
Built properly, this gap will run so cool, and quench so well, that the
actual ionization factor of the electrode will not be a factor.
Ku> ps. did you get the file using the ftp-to-mail gateway?
I have been very, very, busy. But I can tell that SOMEONE has been
visiting there, as I have received E-Mail from people who have accessed
the material and are starting projects. It is also a reason why Chip
was recently swamped with people who are getting on the mailing list.
I will try to make some time, as I have yet another person inquire
about the ftp address so he could find out what files are available.
Thanks, Richard Quick
... If all else fails... Throw another megavolt across it!
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