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Re: Dump the RSG!
From: randy-at-gte-dot-net[SMTP:randy-at-gte-dot-net]
Sent: Friday, November 07, 1997 9:53 PM
To: Tesla List
Subject: Re: Dump the RSG!
Tesla List wrote:
>
> From: Robert W. Stephens[SMTP:rwstephens-at-headwaters-dot-com]
> Reply To: rwstephens-at-headwaters-dot-com
> Sent: Thursday, November 06, 1997 8:18 PM
> To: Tesla List
> Subject: Re: Dump the RSG!
>
> >
> > From: David Huffman[SMTP:huffman-at-FNAL.GOV]
> > Sent: Wednesday, November 05, 1997 8:39 AM
> > To: Tesla List
> > Subject: Re: Dump the RSG!
> >
> > What if the coronatron was run in pulsed mode? Has it been and does it look
> > like a RSG at the same BPS? Isn't the whole idea here to quench at the first
> > null to keep the energy in the secondary?
> > Dave Huffman
> <snip>
> > >Rob Stephens has the largest tube coil I have ever heard of (the
> > coronatron-
> > >10KW) and it is nice, but the RF burns touching anything within meters are
> > >severe. Most tube coils are basically just big oscillators with more or
> > >less CW performance, tremendous radiation and very small sparks for the
> > KWH.
> > >It is what you want that makes the difference. Big tubes make for big open
> > >ended hertzian radiators.
> > >
> > >Richard Hull, TCBOR
>
> Dave,
>
> I built the Coronatron (based on 3, BR1160, EEV, 5 kW each
> dissipation triodes in parallel) to deliver smooth CW RF at the highest possible
> voltages the driving power would allow in non-breakout mode for lab work.
> The early demo richard Hull witnessed employed a classical secondary
> resonator, but the Coronatron is actually being outfitted as a maggy
> with an external tertiary resonator for several reasons, the least of
> which is not a restrictive ceiling height in my high voltage test
> room. It is not and will likely never be configured for pulse mode.
>
> I have however done some preliminary work
> pulsing much smaller vac toob TC systems in the 1 kW range with a
> mercury thyratron in the cathode return of the oscillator with
> interesting results. As the duty cycle the RF oscillator is reduced
> in relation to the available 60 Hz sinewave plate supply energy from
> the unfiltered mains transformer the TC discharge becomes less and
> less like a gas burner flame, and more and more like minature
> lightning bolts ala the traditional spark gap driven TC. The noise
> level emanating from the discharge is similarly increased as the duty
> cycle of each RF burst is shortened. In theory, shorter duty cycles should
> allow one to clobber any given oscillator tube with increasing amounts of peak
> power (maintaining the average power allowed by the tube specs).
> This is something I intend to experiment with in the future as
> exeriment # 6,007. I'm at experiment # 4,003 just now.
>
> rwstephens
Robert:
I am thinking of trying something similar.. but an amplifier with
pulsed input. Can you give us any idea of the duty cycle and PPS rate
that approximated RSG performance? Any thoughts as to whether filtered
or unfiltered B+ would be best, i.e. would the peak voltage of the
unfiltered DC provide a little more useful oomph to the primary?
Of course, in the best of all worlds, the tube would be at absolute-max
B+ ratings, so filtered would be the answer... :)
Am I better of to aim for a "ringing" primary, or to treat the
whole coil as more-or-less an air-core transformer that happens to have
a pulsed input? I am thinking the latter....
The whole point being, as you stated, to maximize the effects avialable
for a given plate dissipation.
Thanks for the post, it has confirmed some of my suspicions.
It sounds as though you are very busy, so I hope you can reply, at your
convenience.
Thanks,
Randy