RE>alternate spark gap desi (fwd)

---------- Forwarded message ----------
Date: 08 Jul 1998 19:19:38 -0700
From: Dale Hall <Dale.Hall-at-trw-dot-com>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: RE>alternate spark gap desi

RE>alternate spark gap design (fwd)
Hi Deano,
I like your idea.

I use SPDT vacuum relays to effect the same end in my DC coiling at low
rates (loner discharges under manual control - relay coil is briefly pulsed
to induce gap conduction to minimize sticking).

I eagerly await your posting results to the list.

I wonder if there would be significant power savings.
Guess it would depend on gap width/dwell time shorting Xfmr though the series
choke inductance, but choke should effectively moderate that w/minimal loss.
Isolating the ringdown is a benefit. Mistunes won't feedback across gaps
to power Xfmr perhaps easing quench chaos.
Certainly want to size charge_ring posts to assure full Cpri charge for the size
and fastest dwell time considering your Xfmr Sec impedance. The discharge 
posts can be much shorter in rotation dir (and even desirable to encourage

Dale, RB, Calif
Date: 7/6/98 11:35 PM
To: Dale Hall
From: Tesla List

Date: Sun, 5 Jul 1998 20:30:46 -0600
From: David Dean <deano-at-corridor-dot-net>
Subject: alternate spark gap design

Let me bounce this off you-

SecHV trans  RSG1   RSG2     prf TC
(-------------> <--------> <-------------)
(                      l                     )
(                      l                     )
(                    ===                  )
(   Tank Cap.    l                     )
(                      l                     )

[NOTE: I tried to straighten the diagram out, as it suffered from 
 tab to space translation problems -- Chip ]

Assuming RSG1 and RSG2 disks are coaxially mounted
on a single shaft, have eight electrodes each(45deg. apart),
and disks are offset 22.5deg. so that they fire alternately-

Possible advantages-
Reduced power consumption due to elimination of short circuit
conditions across HV trans while cap discharges
Improved quenching of RSG2 as no tendency to power arc (no ac applied
during this phase)
Less noise getting back into power supply due to better isolation

Any thoughts?

This idea was inspired by a similar proposal for a DC system on this
list a few days
ago, I have been giving much thought to the idea since then, am just
about to start building my first
RSG, leaning toward the two disk charge/discharge design, would like to
if anyone has tried this, or can show an obvious reason why it would not work
before I start.

Thanks, deano