Geotron,
Awesome! Then your plasma ignition front side seems to be working
correctly and your coil HV definitely seems to be the + polarity since
you are getting the plasma with your diodes in that position.
Is it a really loud snap?
Also, if you spray very fine atomized tap water mist on it, it should grow
in intensity and get much louder and brighter.
Anyway, with just the front side plasma ignition, there won't be much
punch in that inductor but your circuit is all correct from what I see.
If you have a separate power supply like a variac thru a bridge, you can
charge a "booster cap" on that LV rod side and with diodes leaving the
LV rod booster cap - hv diode string of course.
This is what I mean:

So what happens is your plasma discharge from the front side igntion
slams into the LV rod with another cap and reverse diode. So instead of
just starting with a HV discharge into that LV rod, you're starting with
a plasma ignition discharge into the LV rod. In a way, this compensates
for not having a monster cap discharge from the front side.
Anyway, with the 3 point rod spacing as shown, the plasma ignition
discharge is first forced to jump the LV rod with a charged up cap
there opposing it. Diode shuts off, ignition plasma has nowhere else to
go but over the gap to the inductor rod.
Gap is ionized plus the negative suction created causes that LV cap
to discharge over gap following it. Basically same concept as plasma
ignition but scaled up.
If you do this, that inductor will give one heck of a pulse to repel or
attract a magnet on a rotor and you have it.
If you have a LV booster cap like 400v 330uf or so, you can charge it
with a variac through a full bridge. Start it off at low voltage and get the
plasma ignition triggering at whatever speed. Slowly bring the voltage of
the booster cap up and you'll see the blast at the gap going to the
inductor getting bigger and bigger and of course the inductor pulse gets
stronger and stronger.
With a scope, you can see the plasma ignition cap and/or the booster
cap, the discharge rate of the cap is way faster than it is "supposed" to
be in my opionion the reason is because it is discharging into a negative
resistance - the suction caused by the negative suction caused by the
blasts being instantly turned away by the diodes and forced to go
elsewhere.
So the cap doesn't discharge into a 0 to positive impedance, it is being
pulled into a negative impedance and this pulls the "charge" from the
cap at a rate faster than ambient so you get some serious time
compression happening.
Anyway, notice the inductor rod is closer to the LV rod than the HV
rod. If it is closer to the HV rod, the plasma ignition will discharge there
first and you don't get the LV cap discharging as planned. Being further
away, plasma ignition is forced to discharge to the LV rod since that is the
closest and when diode shuts off, then it has nowhere to go but the
inductor rod.
I'm excited to see your progress on this! Looking forward to Pranav
getting the results too!




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