Author Topic: Spark length to toroid size question.  (Read 441 times)

Offline Sparkjunkie15

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Spark length to toroid size question.
« on: February 20, 2022, 02:45:37 AM »
I have built up a microbrute drsttc from EVR and I get the best discharge results with two 8x2” aluminum toroids. I have tried adjusting the primary turns and height with a single 8”x2” toroid but the discharges are substantial smaller than with two. I had originally assumed that the additional toroid was lowering the secondary resonance frequency and matching my primary resonant frequency better but after playing with the primary so much I don’t think that’s where the performance difference is coming from. I would ideally like to run a single toroid since the second is from another coil project, but mainly I want to understand what other factors are at play here. For reference the secondary resonance frequency is around 350-375khz(according to java tc)depending on the toroid setup.

Any guidance would be greatly appreciated.

Offline AstRii

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Re: Spark length to toroid size question.
« Reply #1 on: February 20, 2022, 06:45:32 AM »
First thing coming to my mind is that larger toroid = larger capacitance = higher energy stored which would help with air breakdown and push more current during spark loading. Although Tesla coil streamers are far from DC discharges for which this would be true. Not sure if the same thing can be applied to AC streamers.
Marek Novotny
Czech Republic, Czech Technical University in Prague
www.uhvlab.org

Offline MRMILSTAR

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Re: Spark length to toroid size question.
« Reply #2 on: February 20, 2022, 05:47:24 PM »
Here's my speculation. Stacking two toroids provides a rough approximation to the field shape of a larger toroid. As the radius of the toroid gets larger it becomes harder for the streamer to break out but when it does it will be longer.
Steve White
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Offline Sparkjunkie15

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Re: Spark length to toroid size question.
« Reply #3 on: February 20, 2022, 09:24:03 PM »
Here's my speculation. Stacking two toroids provides a rough approximation to the field shape of a larger toroid. As the radius of the toroid gets larger it becomes harder for the streamer to break out but when it does it will be longer.

This falls inline with what I’ve been experiencing, even with a second homemade crap toroid on top of the quality one the arcs are much larger.

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Re: Spark length to toroid size question.
« Reply #3 on: February 20, 2022, 09:24:03 PM »

 


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