[Prev][Next][Index][Thread]
Re: Slow Wave Helical Resonator Experiment
to: Terry
After reading that paper we also tried to reproduce those results and also
never could find any "lingering" potential rises.
DR.RESONANCE-at-next-wave-dot-net
----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Slow Wave Helical Resonator Experiment
> Date: Sunday, December 06, 1998 9:14 PM
>
> Original Poster: Terry Fritz <twf-at-verinet-dot-com>
>
> Hi All,
>
> This is an old subject but tonight I repeated an experiment described in
> the paper "Tesla Coils: 1890-1990 100 Years of Cavity Resonator
> Development" by James and Kenneth Corum. In that paper, they describe a
> phenomena where the voltage on the secondary rises by standing waves in
the
> secondary after the primary spark goes out. They describe how the Tesla
> coil behaves as a "velocity inhibited quarter wave resonator". In this
> paper they describe the secondary voltage increasing to very high values
> after the primary spark has gone out. Apparently over 10 times what it
> was during the ring-up period. Those that have studied their paper will
> recognize this as being the subjects of Figures 4 and 5 in that paper.
> They also describe the "coherence time" as the time it takes for this
> voltage rise to reach a maximum. This is under low loss or no breakout
> conditions.
>
> At:
>
> http://www.peakpeak-dot-com/~terryf/tesla/misc/corum.gif
>
> are the scope waveforms that show secondary terminal voltage (top trace
> 200kV/div) and primary current (bottom trace 100A/div) that I measured
> while repeating their described experiment on my system. This was with no
> breakout on the terminal. The coherence time they describe should be
114us.
>
> As the scope picture I posted shows, there was absolutely no observed
> voltage rise. The primary circuit quenching is clearly defined in the
> bottom trace occurring at 180uS (50us/div) on the fourth notch after the
> initial burst began. The secondary voltage at 294uS (180+114) appears
very
> stable at ~70kV peak with no voltage rise or any evidence of the effects
> described in the Corum's paper.
>
> Many have questioned this part of the paper. No one has been able to
> reproduce the results or claims this paper makes. There are obvious
> theoretical and conservation of energy issues with this phenomenon as
well
> which tend to conflict with the paper's claims. Many people have failed
to
> reproduce this and I now add myself to this list. This paper was written
> in 1990 and we obviously know much more now than was known then. There
is
> probably no value in rehashing this subject too much but I had the
> equipment setup and I was curious to find the answer for myself as
well...
>
> Terry Fritz
> terryf-at-verinet-dot-com
>