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Registered Member #61428
Joined: Sat Jan 14 2017, 12:39PM
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Posts: 50
Just a simple question that has just popped into my head that I've never seen discussed: Would the secondary side of a TC operate the same in a vacuum as it would in an atmosphere? What about if the top load were to contain a heater and be coated in a low work function substance? Would there be significant thermionic emission, and where would it begin and end? What would it look like and could it be used in things like ion thrusters or other space-based applications? I'm not too sure about any of the answers but I'd love to read anything from anyone who is.
Registered Member #1321
Joined: Sat Feb 16 2008, 03:22AM
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Posts: 843
Here's an example of a "Tesla coil" operating in a vacuum (the authors refer to it as a "coaxial spiral-line resonator"). This device uses an array of some kind of graphite field emission cathodes to produce multiple electron beams which are then brought out into the atmosphere through an array of thin foil windows.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
I've not tried so I'm guessing;
First look at
If the TC is powered whilst pressure is reduced from atmospheric, then you will get a result like in the video pointed to above (I like his videos) If a hard vacuum is created before the TC is powered up then there should be no arcs.
As a TC is a.c. I don't know what would happen with the filament but I suspect rectification and most significantly ... x-ray generation.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Yes, X-rays would be a risk. Interesting idea though: what would happen to a piezoelectric transformer in a vacuum? Same sort of problem but if it were clean enough it couldn't arc over so would be ideal for certain applications.
Registered Member #1321
Joined: Sat Feb 16 2008, 03:22AM
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Posts: 843
Conundrum wrote ...
Yes, X-rays would be a risk. Interesting idea though: what would happen to a piezoelectric transformer in a vacuum? Same sort of problem but if it were clean enough it couldn't arc over so would be ideal for certain applications.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Fascinating link! I really must try this one day if/when I get my vacuum 2 stage setup going again. Wonder if it would work in helium (He) at low pressure but still not a vacuum?
Registered Member #4362
Joined: Sat Jan 21 2012, 03:44AM
Location: Texas
Posts: 98
Interesting post. I would like to add a question if you don't mind. Suppose you run a bipolar coil in a vac. chamber with a sealed partition between the two output terminals ? Would you see some type of plasma build up as the coil charged both sides of the partition ? Like plates on a capacitor.
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Tesla coils in a vacuum
