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Voltage/Length (fwd)
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From: D.C. Cox [SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent: Wednesday, February 04, 1998 12:18 AM
To: Tesla List
Subject: Re: Voltage/Length (fwd)
to: Greg
I will check my notes but I believe the total cap including electric field
was closer to 200 pF. We were running at 14.4 kV RMS with resonant peaks
in the primary measured at approx 24-26 kV. No where near the 50 kV you
mentioned. Output was at 985 kV in the one-shot mode and in the RSG
"running" mode the streamers were solid connecting at 9 ft. with some at
11-12 ft. but only very intermittant.
Hope El Nino is slowing back a bit but I see a low parked right off the
coast that should supply you with 2-3 more storms before it's over. I
image the shipyward is getting a bit "muddy"?? or are you on pavement (read
small lake by now).
DR.RESONANCE-at-next-wave-dot-net
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> From: Tesla List <tesla-at-pupman-dot-com>
> To: 'Tesla List' <tesla-at-pupman-dot-com>
> Subject: Voltage/Length (fwd)
> Date: Tuesday, February 03, 1998 9:53 PM
>
>
> ----------
> From: Greg Leyh [SMTP:lod-at-pacbell-dot-net]
> Sent: Tuesday, February 03, 1998 8:10 AM
> To: Tesla List
> Subject: Re: Voltage/Length (fwd)
>
> D.C. Cox wrote:
>
>
> > One could strike an arc with a super powerful welder or a 10 kV arc at
> > perhaps 1000 amperes and surely draw an arc 9-10 feet long so there are
> > many parameters. We used three different "standard" Tesla coil to take
our
> > measurements and used a measured calibrated x-radiation system to
determine
> > the potential. The coil, when operated in free air, and running at the
> > power levels I specified produced a striking arc at 9 ft in length. In
the
> > pulsed mode it generated 1 MEV x-rays. Measurements were taken at
various
> > potentials and spark lengths with 3 different systems and the 500 kV
and
> > 1000 kV free air sparks measured 5 ft and 9 ft respectively in
continuous
> > 400 pps mode. Primary cap value on the 9 ft spark primary was .05 MFD
and
> > .03 MFD on the 500 kV system.
>
> I appreciate the efforts that you and your friend at the
> Univ. of Wis. plasma physics dept went through to develop
> and calibrate the 1MeV x-ray detector -- a very novel way
> of measuring HV! It is a bit of a mystery, however, as to
> how the coil could have generated 1MV in the first place.
>
> Assuming 100pF for the total secondary output capacitance
> and given 0.05uF for the primary capacitance, the transfer
> ratio (at 100% efficiency) is 22.4, requiring a primary
> voltage of 45,000V. If the coil efficiency is only 75%,
> then the required minimum primary voltage to get 1MV out is
> well over 50,000V!
>
> Clearly I am missing something somewhere, or perhaps my
> assumption of the secondary C is way off. I had estimated
> about 50pF for a single 3ft toroid, and 40 to 90pF of
> coil self-capacitance. Does this seem right?
>
>
> -GL
>