Better tuning point?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

Hi All,

I set ScanTesla to run a wide range of secondary inductances and top load 
capacitances to try and get better performance into a 3.6pF + 220k streamer 
load.  It is a conventional coil 
(http://hot-streamer.com/TeslaCoils/MyCoils/BigCoil/BigCoil.htm) with a 
27.7uF primary cap charged to 21kV.

The program found a far better match!!

http://hot-streamer.com/temp/BetterTune.gif

Only the secondary inductance and secondary capacitance where changed.  The 
blue line is the old normal case and the red line is the more optimal 
case.  At 120BPS, the input energy is 733 watts.

The peak top voltage increased from 342kV to 539kV.
The streamer power increased from 229 watts to 429 watts.
Peak primary current was fairly unchanged at 295 amps.
Primary RMS current went down a little from 11.86 amps to 10.02 amps.

If we assume streamer length is proportional to the square root of streamer 
power, then the spark length might increase  37% with the better tuning.

However, the best tune point is with a 507mH secondary coil and only a 
4.3pF secondary capacitance.  The low secondary capacitance is probably 
impossible to realize.  That would seem to go opposite to our observations 
that a bigger top load gives bigger sparks.....

The primary and secondary Fo frequencies were 83233 and 107791Hz as opposed 
to the normal case of 83838 and 87181Hz.  So the secondary Fo frequency was 
tuned 29.5% higher than the primary Fo frequency.

Not sure what it all means....  The full coil data is below.

The models were run with:

http://drsstc.com/~terrell/modeling/ScanTesla610.zip

This version seems very stable now.

Cheers,

	Terry

New Matched Case
===================
ScanTesla  V-6.10  June 14, 2005  Terry Fritz
C1 2.770000e-008 2.770000e-008 1.000000e-009
R1 3.000000e+000 3.000000e+000 1.000000e-001
L1 1.320000e-004 1.320000e-004 1.000000e-007
L2 5.000000e-003 1.000000e+000 1.000000e-003
K12 1.450000e-001 1.450000e-001 1.000000e-003
R2 3.910000e+002 3.910000e+002 1.000000e+000
C2 1.000000e-012 1.000000e-010 1.000000e-013
C3 3.600000e-012 3.600000e-012 1.000000e-012
R3 2.200000e+005 2.200000e+005 1.000000e+003
T1 0.000000e+000 5.000000e-003 -1.000000e-007
Vrail 0.000000e+000
VCpri_init 2.100000e+004
DwellTime 4.000000e-004
Current_Limit 5.000000e+004
BangEnergy_Limit 1.250000e+001
Goal Type 0


ScanTesla  V-6.10  June 14, 2005  Terry Fritz
NEW HIGH!! Goal = -5.393332e+005
Goal Time = 2.667225e-005
Model Number = 497014
Goal Number = 6440

Cprimary = 2.770000e-008
Lprimary = 1.320000e-004
Rprimary = 3.000000e+000
Coupling = 1.450000e-001
Csecondary = 4.300000e-012
Lsecondary = 5.070000e-001
Rsecondary = 3.910000e+002
Cload = 3.600000e-012
Rload = 2.210000e+005

Ilprimay Maximum = -294.318534
ICprimary RMS/sqrt(BPS) = 0.914302
VCprimary Maximum = 20957.760358
VCsecondary Maximum = -539333.165418
Bang Energy = 6.107850
Load Energy = 3.573993
Primary F0 = 83232.565556   Secondary F0 = 107790.856840
=============

Old Normal Case
=============
ScanTesla  V-6.10  June 14, 2005  Terry Fritz
C1 2.770000e-008 2.770000e-008 1.000000e-009
R1 3.000000e+000 3.000000e+000 1.000000e-001
L1 1.250000e-004 1.400000e-004 1.000000e-007
L2 7.540000e-002 7.540000e-002 1.000000e-003
K12 1.450000e-001 1.450000e-001 1.000000e-003
R2 3.910000e+002 3.910000e+002 1.000000e+000
C2 4.420000e-011 4.420000e-011 1.000000e-013
C3 3.600000e-012 3.600000e-012 1.000000e-012
R3 2.200000e+005 2.200000e+005 1.000000e+003
T1 0.000000e+000 5.000000e-003 -1.000000e-007
Vrail 0.000000e+000
VCpri_init 2.100000e+004
DwellTime 4.000000e-004
Current_Limit 5.000000e+004
BangEnergy_Limit 1.250000e+001
Goal Type 0


ScanTesla  V-6.10  June 14, 2005  Terry Fritz
NEW HIGH!! Goal = 3.419906e+005
Goal Time = 3.232419e-005
Model Number = 52
Goal Number = 49

Cprimary = 2.770000e-008
Lprimary = 1.301000e-004
Rprimary = 3.000000e+000
Coupling = 1.450000e-001
Csecondary = 4.420000e-011
Lsecondary = 7.540000e-002
Rsecondary = 3.910000e+002
Cload = 3.600000e-012
Rload = 2.210000e+005

Ilprimay Maximum = -296.528762
ICprimary RMS/sqrt(BPS) = 1.082289
VCprimary Maximum = 20957.760570
VCsecondary Maximum = 341990.624792
Bang Energy = 6.107850
Load Energy = 1.910045
Primary F0 = 83838.133083   Secondary F0 = 87181.296656
================