# Help in calculations

• To: tesla ml <tesla-at-grendel.objinc-dot-com>
• Subject: Help in calculations
• From: Skip Greiner <sgreiner-at-mail.wwnet-dot-com>
• Date: Mon, 22 Apr 1996 19:27:37 -0700
• >Received: from main.wwnet-dot-com (main.wwnet-dot-com [206.62.36.1]) by uucp-1.csn-dot-net (8.6.12/8.6.12) with SMTP id SAA26724 for <tesla-at-grendel.objinc-dot-com>; Mon, 22 Apr 1996 18:47:21 -0600

```Hello Everyone
I have been working on shunt or neon transformer driven TCs with some
moderate success. I have spent some time reviewing the archieves for the
numerous references in the past and they have been quite enlightening, in
particular Richard Quick's responses offer some real insights into
various aspects. Nevertheless I have continued to pursue longer
discharges using synchronous rotary gaps (srg) and now am now using a
15kv, 120ma neon. I have found several advantages in using a srg. For one
thing I can actually control the voltage across the primary capacitor by
setting the firing point in the input sine wave. It also appears that  a
maximum discharge can be achieved by adjusting the exact firing phase of
the gap(s). Right now I am using a srg with one firing for each half of
the input sine wave. It is not obvious to me that I am achieving maximum
power transfer with only one firing per half cycle. It is certainly
possibe to add gaps or contacts to add another firing   per each half
cycle but would I gain anything.

My question(s) to the group are for help in trying to determine the
voltage across the primary capacitor at any time "t". My problem is how
to handle the current limiting / impedance of the neon and how to fit
this into the classical capacitor charging time constant.

For instance...If I set the first gap to fire when the voltage across the
cap is at .707 of the peak, how long will it take the cap to recharge to
.707 of the peak again? Will it even get there during the same half
cycle? If I can know the time constants involved, it is obvious that the
srg can be set up to fire at the right times. Also if I know the the
maximum voltages to which I can get the cap charged, it becomes trivial
to determine if additional fires per half cycle will gain any increase in
power transfer.

Why do all this? Basically I believe that bigger discharges can be wrung
out of neons and this may be one way of doing it.

My present system using the above mentioned components and a .021 cap
delivers 54" point to point discharges. Since I have gone to the
synchronous gaps I have not blown up any more neons or capacitors either.

I would appreciate any help that anyone in the group can offer.

Skip Greiner

```