Re: [TCML] X-ray cable best practices for feeder cable

["DC Cox" <resonance@xxxxxxxxxxxx>]

Thanks for the interesting info Jim.  I was going to tinker with an EMP
generator, but, with my pacemaker/defib internal, I decided this is one area
I will
just coast past.

I only had a 12 ft long section of RG-8U coax teamed with a .06 uF
capacitor, and was totally amazed to see it firing across the large HV
bushing.  For obvious reasons, after replacing the pole xmfr, I never
repeated the experiment!

Dr. Resonance



On Fri, Jan 9, 2009 at 2:05 PM, Jim Mora <wavetuner@xxxxxxxxx> wrote:

> Hello Dr. R and Dr T,
>
> I don't doubt your observations at all. I did a search on Blumlien after
> the
> thread started. It is generally made of multiple segments of coax or
> capacitive plates and pulsed energy. Check this Defense site pdf, complete
> with the math:
>
> http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA422221&Location=U2&doc=GetTRDoc.p
> df
>
> Perhaps the question is a moot point though:
>
> How can the voltage ever rise above the set point of robustly constructed
> horn safety gaps on each end? Frequent firings would confirm your point.
> >From my view, cutting the ends and stripping cable back does not negate
> the
> capacitance effect of stored energy. This may make unexpected contact with
> the feeder all the more dangerous. I surely like the safety aspect of a
> grounded, terminated coaxial cable. The feeders in utility company under-
> ground HV are all of course coaxial and carry AC though not pulsed
> hopefully. The big difference I suppose is the capacitance per foot.
>
> Thanks to all for suffering though this thread. I do believe it is an issue
> that engineers that specialize in this effect would help put to bed.
>
> Jim Mora
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
> Of DC Cox
> Sent: Friday, January 09, 2009 9:42 AM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] X-ray cable best practices for feeder cable
>
> We have a very dedicated sec earth ground, so I'm certain it was not that
> factor.
>
> I, too, was very amazed to see 16" long sparks firing rapidly across the
> insulator, and then discussed it with one of my former
> colleagues from Univ. Wis. Dept. Plasma Physics, who told me about the
> blumlien effect.  He said it's possible to to 4 x and even up to 6 x with a
> single coaxial cable.  In his experience it punctured a 1.2" inch thick
> coaxial cable repeated at various lengths along the cable.
>
> Best regards,
>
> Dr. Resonance
>
>
> <snip>
>
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