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

["Jim Mora" <wavetuner@xxxxxxxxx>]

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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