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Re: static "sucker" gap / cap stress
Original poster: "Christoph Bohr by way of Terry Fritz <teslalist-at-qwest-dot-net>" <cb-at-luebke-lands.de>
Hi!
Good to find someone who knows the cap, although I think I have seen them on
some coils on the net.
I got mine from alltronics on ebay for 50$, think this was OK. It came
without a label but with the catalog number scratched into the housing.
I thought about buying another one, Tesla Systems Research is offering them
for 73$ I think...wonder if the price is OK.... I initially bought this one
because I was looking for extra security, hearing that they can blow up too
is really disappointing....I have to do most coiling indoors.
At the moment I am transferring roughly 5 KVA through the system, maybe that
is too much for a single cap, but your Idea with the "emergency shut off "
via temperature sensing seems really good and I'll probably build something
like this and with the new information shielding will surely be installed
next time.
Do you think I should buy another cap? or is any other maxwell type better
suitable? or MMC.....at least MMCs seem to be "blow up friendly" for indoor
use.
BTW: I checked my spec paper again and its really has a line in it which
says: max continuos rep rate: 500 PPS....I thought this means 500 shots per
second....but that was probably wrong after what you said....or I might have
the wrong spec sheet.
My sheet can be seen at http://www.luebke-lands.de/media/20P005.pdf maybe
you can have a llok at it or hand me a link to your paper....
Thanks for your support!
sincerely
Christoph
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, April 24, 2003 7:26 AM
Subject: Re: static "sucker" gap / cap stress
> Original poster: "Jeremy Scott by way of Terry Fritz
<teslalist-at-qwest-dot-net>" <supertux1-at-yahoo-dot-com>
>
> Hi,
>
> I use the exact same Maxwell cap in my systems,
> however I double them up, that is, I use four
> in a parallel series configuration. .03uf, 70Kv
> for nice long runs. They are oil filled which makes
> them nice bombs when they do blow up. I'm thinking
> of enclosing mine in a nice hardwood box with a fan
> and maybe one of those CPU temperature display
> thingys.
> (Idea: wire a thermistor into relay circuit that
> controls power to the transformer.)
>
> If you look at the spec sheet from Maxwell you'll
> find that they aren't rated for continuous stress.
> (They're really designed for the occasional one shot
> brief discharges: X rays, MRI's and that sorta thing.)
>
> The fact that they even last in a tesla circuit is
> testament to Maxwell quality. I've seen one cut
> up and there were plenty of black little holes
> that were the result of a puncture, but the cap
> fixed itself and before disassembly remained fairly
> close to it's original value.
>
>
> --- Tesla list <tesla-at-pupman-dot-com> wrote
> > Original poster: "Christoph Bohr by way of Terry
> > Fritz <teslalist-at-qwest-dot-net>" <cb-at-luebke-lands.de>
> >
> > Hello everybody.
> >
> > After experimanting with RSG's I made a little
> > excursion back to static gaps.
> >
> > I built a sucker gap with 2 elektrodes and attached
> > an ordinary vacuum
> > cleaner to it. ( ordinary design....t-shaped sewer
> > tube and 2 copper tubes )
> > The results with my current magnifier were
> > disappointing as the quenching
> > seems not to be too good.
> > But with the ordinary 5" setup I got really hot
> > white steamers to the
> > ceiling space-limited by the walls to 4 feet.
> > The power in the arcs must have been really big,
> > they almost looked like a
> > time-exposure.....only real ;-)
> > This mus be due to the high current the MOT-Supply
> > can deliver.
> > The break rate seemed very high, estimated between
> > 400 and 800 bps.
> > Only problem that occoured: THe tank cap got warm,
> > nit really hot but
> > palpable after some 20 second runs at roughly 5KVA (
> > no PFC ).
> > I use a Maxwell 37667 Type cap, 30nF and 35KV. Is
> > this cap to weak for this
> > arrangment or do I do something wrong that puts
> > stress an the cap.
> > Tuning was done at 1KVA before I turned to higher
> > power levels....but the
> > effect of streamer-loading shouldn't affect the
> > tuning too much.
> >
> > My personal results:
> >
> > Pros: The sucker gap really performs well and is
> > extremely cheap and easy
> > to build and seems to be very robust, a good choice
> > and a really good
> > performer in my system at least.
> >
> > Cons: the noise really requiers hearing protection,
> > I loosend one of my
> > earmuffs for a moment an was really
> > shocked.....luckily noone was at home
> > at this time.
> > Bad performance with my magnifiers
> > although I read about people
> > using them succesfully with maggies. I will go for
> > high bps RSG with that I
> > think, perhaps with
> > sucker gap in series to aid quenching.
> >
> > Questions to be solved: Cap heating.....is it bad or
> > not......dont want to
> > destroy it as its my only professional pulse cap.
> >
> > I hope I don't mess up the list with such "low-level
> > posts" but I like to
> > share results as sometimes it might be usefull for
> > other users,too ...
> >
> > happy coiling
> >
> >
> > Christoph
> >
> >
>
>
>
>