Re: ScanTesla Version 7.60

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Hi,

Here is the new and improved version:

http://drsstc.com/~sisg/files/scantesla/scantesla760.zip

The improvements are:

1. If you set Goal Type to "-1" it turns off the time wasting 
waveform file.  This make it run MUCH faster so dest will be happy ;-))

2. Vastly improved automatic streamer model.  You can now input a 
breakout voltage (~75kV/ inch radius).  It dynamically sets the load 
depending on coil power, streamer length, and time.

3. There is a distance to ground input now which allows streamer hits 
to ground and optimization (good luck trying to tune your coil that good ;-)).

4. Automatic L1 tuning has been removed since it never did work 
well.  I also no longer mention Goal_Type 0 since it is pretty useless.

Note that the input.txt file format has changed to add Breakout 
Voltage and Strike Distance.  You can easily modify old files for this change.


The dynamic streamer modeling section is below:

// Dynamic streamer 
model********************************************************

	LeaderLength = 2.8 * 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 = 2.8 * sqrt(0.5 * VCsec_max * VCsec_max * (C2 + C3) * 
BPS);  //Secondary energy length factor.

		BreakoutLength = 2.8 * sqrt(0.5 * BreakoutVoltage * BreakoutVoltage 
* C2 * BPS);  //Secondary breakout length.

		if (LengthTemp < BreakoutLength) {C3 = 0.06666667 * LengthTemp * 
1.0e-12;}  //Streamer capacitive load.
		else {C3 = (0.15 * LengthTemp - 0.08333333 * BreakoutLength ) * 1.0e-12;}


	//Streamer strike to ground
		if (LeaderLength >= StrikeDistance && Strike == 0) //Turn Strike on.
			{
			Strike = 1;
			TimeTemp = T1;
			}

		if (T1 >= TimeTemp + 2 * (2 * pi * sqrt(L1 * C1))  && Strike == 1) 
//Turn Strike off.
		   	{
			Strike = 2;
		   	}

		if (Strike == 1) //Strike topload drain to Eload.
			{
			Eload += 0.5 * C2 * X0[2] * X0[2] * T1_inc + 0.5 * C3 * X0[3] * 
X0[3] * T1_inc;
			X0[2] = 0.0;
			X0[3] = 0.0;
			}

		}

// Dynamic streamer 
model********************************************************

It basically uses John Freau's equation for streamer length and uses 
secondary energy to find the Cload value.  Cload has a near and far 
equation now that is governed by the breakout voltage.  It seems to 
all match measurements well.

The streamer strike just drains the top terminal energy to ground for 
two cycles.  This seems to match SISG strikes well.  It is amazing 
how much current must be in those strikes to drain the terminal in 
microseconds!!  The secondary inductance seems to be a dead short or 
bypassed to ground by the direct terminal to ground 
capacitance.  That might be yet another factor in racing arcs....

Cheers,

	Terry