Sold state IGBT disruptive coil spark gap idea

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Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Hi All,

It's been 24 days now and it is pretty much all finished ;-))

Without messing with coupling, tuning (probably real close), or any 
thing like that, I can fairly easily hit 24 inches at 117W - and 30 
inches at 183W.  The Freau number there is 2.22 in both cases.  That 
number seems very "constant".

I was only able to go to 5 sections instead of six due to the limited 
safety area in my basement.  With six sections, it should get to 263 
watts for 36 inches.  The whole mess could probably be more optimal, 
but my goal here was just to get "one" working ;-))

I made a movie here, with a good camera this time, of it doing 30 
inch hits ;-)  (25 MB  MPG movie file)

http://rapidshare.de/files/21113928/SISG-183W-30in.mpg.html

Got to the lower right and click "free".  It makes you wait about 30 
seconds to read the ads and click off the popups.  Then type in the 
funny letters and download.  I have been using www.RapidShare.de a 
lot so buy everything in the ads and donate to them ;-))  It 
certainly solves the big file distribution problem!!  It is a plain 
MPG file that even a modern DVD player should play if you burn it to disk...

The little heat sinks get to about body temperature for short runs 
which is just right according to the calculations.  Bigger heat sinks 
and/or a fan would be good for extended operation.

The full data on everything is here (might take a while to DL since 
it is 'busy"  ;-)):

http://drsstc.com/~sisg/SISG.pdf

I still need to finish this up, but it is up to date as of last 
night.  Let me know, off list, if there are any errors or something I 
should add or polish up.  It was written in parts, very fast ;-)  But 
it is the best way to document stuff like this.  A far cry from the OLTC :o)))

Nothing has blown up yet and everything seems perfectly happy.  The 
only bug was the DC MOT charging which I had to whip up a high 
voltage blocking inductor for.  But that was a mundane typical MOT coil issue.

You have to be careful to turn up the variac until is just starts to 
run smoothly (120 BPS) and no more.  If you turn up the voltage too 
high, the BPS rate can go up dramatically and overheat the 
IGBTs.  Higher BPS does not seem to increase spark length other than 
making them sound funny.  Sort of "screetchy".

Thanks for everyone's help, input, and encouragement!!!  Looks like 
we all have a new toy :-))))

BTW - The dual MOT system has an extremely dangerous primary 
system!!  Be very careful when working on them especially now that 
there are electronic circuits and stuff in there to fiddle with.  Be 
ultra sure that the power is off before working on them.  Be very 
careful of the output arcs since it is possible for a primary to 
secondary break over to present lethal currents on the 
secondary.  Note too that the primary circuit can be almost at full 
power, but totally silent!

Cheers,

	Terry