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Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 268
Been wondering if a capacitor is charged to high voltage and then arcs through air a electron ionizes another atom starting a avalanche, would that make a excess of electrons, making the capacitor to swing the other direction a bit?
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1714
No.
1. It's common for capacitor voltage to swing the other way during sudden discharge events. Mostly due to inductance in the circuit.
2. The charge carriers in an electric arc, like those in a liquid electrolyte, are a mixture of positive and negatively charged species moving in opposite directions.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Plasma wrote ...
If it's possible to have a sample of just negative ions, and they were injected in to the spark gap, what do you think the effect would be. cheers
They'd whoomph apart from each other due to electric repulsion. A plasma is a neutral mix of both electrons and ions, ions held together by electrons, or electrons held together by ions, whichever view you like. Somehow magically remove one species, and the other would scatter.
Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 268
I heard that uv C, lamp can break down a spark gap, what govern the amount of charged ions, and how does that shorten the distance between electrodes? Cheers
An arc is a kind of chain reaction. If there is a free electron around, it gets accelerated and hits an air molecule and kicks out another elecron off it. Then you have 2 electrons becoming accelerated again and so on. UV radiation splits up molecules into electrons and positive ions and so provides a lot of electrons to start an arc.
Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
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Posts: 268
Would that lower the resistance of the spark gap, if it did how much energy would a uv light need to be to split 10%of the air between the gaps. Cheers
With 10% ionisation you'd have a veritably ionised plasma, resistance would be low maybe a few ohms depending on the geometry of the gap. You'd need a very high power UV source for that, e.g. lasers of many kW or even MW power. This is just a rough guess.
Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 268
Thanks uv source is out, found this book on the
At 150psi air pressure they say it's about 80kv a cm, still trying to think of away to have a 80kv source and 3cm spark gap at 150psi,and a 1ns way to ionizes the gap. Cheers
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Question about a arc discharge in air
