ScanTesla V7.61

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Hi,

There is a new version of ScanTesla!!  Hahaha!!  There is like a new 
version "every day" :O))  "Fresh software"...  Remember when web 
browsers turned every few days ;-))

http://drsstc.com/~sisg/files/scantesla/scantesla761.zip

But this one has my new full streamer model in it.  Based on a lot of 
simulation and measurements.

Cload = (X - D) / 6 x 10^-12 Farads.  If < 0, then it "is" 0.0

X is the streamer length.  D is the terminal or toroid cord diameter.

So if you have a 60 inch streamer off an 8 inch cord diameter toroid, 
the streamer capacitance is:

Cload = (60 - 8) / 6 = 8.67pF

Sounds real simple, but it is amazingly close ;-))  A little heavier 
load apparently.  But much lighter for short streamers...  Zero for 
non-breakout.  The "program" still loads it as a plasma near the 
toroid until the streamer coalesces.

Streamers are about 2pF/foot away from the terminal, but are shrouded 
by the terminal up close, so the line gets shifted depending on the 
terminal cord diameter.  The real slope is like 1.98pF/foot but 
calling it 2.00000pF /  foot is "just fine" ;-)))

Rload maintains at 220,000 ohms "period"...  Freau number at the raw 
terminal power level is "2.62"...  That has been bouncing a bit from 
2.6 to 2.8...  But 2.62 seems to work best with this model at this moment.

Bigger toroids are better.  More BPS does not tend to make longer 
arcs as easily even though they "burn" more power...  More to study, 
but that model does begin to match observations much better 
;-))  Basically, high BPS does not make higher terminal voltage.  The 
program "likes" higher terminal voltage for longer arcs.  There is 
probably a "streamer length / streamer power" quality factor in there 
somewhere.  Like a "brightness".

If Cload is less than zero, then there is no breakout.  Basically, it 
is really hard to breakout a streamer smaller than the terminal 
diameter.  You ""might"" be able to get an 11 inch streamer off a 
"smooth" 12 inch terminal, but will just say it is 12 inches anyway ;-))

Some "way too big of file" notes are here:

http://drsstc.com/~sisg/files/scantesla/StreamerCapacitance.pdf

The C code looks like this now.  See the program in the ZIP file 
(scantesla761.c   Open in any text editor.  Should import to any 
version of C) for all the gory details if you care :

=====================
	LeaderLength = 2.62 * sqrt(Eload * BPS);  //This is the John Freau 
equation based on actual streamer power.

	if (LeaderLength > StrikeDistance) LeaderLength = StrikeDistance;

	if (T1 != T1_start && C3_inc1 < 0.0)  //Do this if active streamer 
modeling is enabled and the model has run once.
		{

		LengthTemp = 2.62 * sqrt(0.5 * VCsec_max * VCsec_max * (C2 + C3) * 
BPS);  //Secondary energy length factor.

		C3 = (LengthTemp - TerminalDiameter) / 6 * 1.0e-12;  //Streamer 
capacitive load.
		if (C3 < 0.0) C3 = 0.0;
======================

DRSSTC feedback is by primary current.  I never added a secondary 
voltage feedback option for those antenna folks...  But so many are 
using primary feedback....  A not too hard fix if really 
needed...  You just trigger on a different state variable...  Note 
that the program can scan DRSSTC dwell time for the best streamer 
within primary current and total coil power limits for the "best" 
sparks without blowing the crap out of everything ;-))

The input file format changed slightly again...  Sorry about 
that...  But Breakout Voltage is now Terminal Diameter.

Put in "-1" for Goal Type to make it run a whole lot faster. - For dest :-))

Let me know if there are screw ups...  But I think this program is 
really starting to come all together now :-))))  It is still real 
messy for non-programmers and stuff...  Sorry...

Feel free to copy, steal, and plagiarize this fully Public Domain 
program at your pleasure ;-))  If you make a better one, send us a 
copy too :-)))

Cheers,

	Terry