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RE: Magnetic Spark Gap...
Ricahrd Quick and interested parties,
We have made a couple of magnetically quenched gaps. I have found that they
perform quite well but, are little better than a really nice air blast or
multiple air quenched series gap. IF I WERE USING 25,000 VOLTS ON A BIG
COIL, I WOULD USE A ROTARY WITH A NUMBER OF SERIES GAPS PLUS A SINGLE SMALL
MAGNETIC GAP. You need the quench action of all available agents at high
powers.
For small systems the mag gap offers little more than similar operation to
much easier to construct series gaps. The novelty of the gap might appeal
to some who wish to make an unusual system. Note it is necessary to have a
lot of flux in the gap. A neodymium-iron boron magnet would seem a natural
but for the fact that they are demagnetized by very low levels of heat.
Therefore a massive alnico 5 or 8 magnet is more appropriate for such gaps.
We treat the gap in minor detail on a couple of our tapes. High power value
of magnetic quench show in demo on tape #24. Constructed gap actually shown
on tape #34. Short segment of rotary plus mag gap in series with maggy #5
on tape #38
Richard Hull, TCBOR.
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From: tesla
To: Tesla-List-Subscribers
Subject: Magnetic Spark Gap...
Date: Friday, April 19, 1996 9:00AM
>From richard.quick-at-slug-dot-org Fri Apr 19 01:12 MDT 1996
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From: richard.quick-at-slug-dot-org (Richard Quick)
Subject: Magnetic Spark Gap...
Date: Fri, 19 Apr 1996 03:40:00 GMT
To: tesla-at-grendel.objinc-dot-com
* Original msg to: Tchand-at-slip-dot-net
Quoting Tim Chandler <tchand-at-slip-dot-net>:
> I have read through all the RQMSGS that I have and I was
> wondering if you have by chance ever experimented with the
> magnetically quenched spark mechanism, that was mentioned
> breifly in the spark gap sections. If not do you know of anyone
> who has, by chance?
Richard Hull has extensive practical experience with EMag gaps.
> I am currently tinkering around with a little make-shift setup
> consisting of little more than a cylindrical EMag., an airblast
> type spark gap (minus the "air"), and a power supply for the
> EMag. I have had very limited results, to say the least.
> Any ideas for better results?
I used the existing frame of my old single air-blast gap (minus
air) with two poly insulatated rare-earth permanent magnets
mounted in between. The magnets were strong enough to remain
suspended across the gap when carefully positioned on synthetic
line (plastic string, cord, etc.). This gap demonstrated the
ability of a mag field to quench, but also illuminated a number
of design difficulties.
Richard Hull has documented on video a working EMag gap that is
quite functional, perhaps he would expound on this and reference
the video report that contains the valuable information on the
construction, tuning, and operation of his gap design?
Richard Quick
... If all else fails... Throw another megavolt across it!
___ Blue Wave/QWK v2.12