I would think you would end up creating a giant "plasma jar", the high 
voltage would ionize everything even in a minimal vacuum and the plasma 
would eat your secondary coil to death. if anything i recommend sealing 
the secondary system in a pressure chamber with "sulferhexaflouide" (I 
think, not quite sure what the gas is called). but whatever it is, it's an 
excellent insulator. Alternatively you could fill a tank with mineral oil 
at a normal pressure.
All in all I don't recommend sticking your coil in a vacuum.
Thanks,
John "Jay" Howson IV
----- Original Message ----- 
From: "Brian Hall" <brianh4242@xxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Sent: Saturday, April 17, 2010 10:13:18 AM GMT -05:00 US/Canada Eastern
Subject: [TCML] Would a Tesla coil work in a vaccum?
As we know a Tesla coil is 'air cored', so what if the entire secondary 
and primary were enclosed in a vaccum chamber? I imagine the toroid could 
sit atop and outside of the vaccum chamber, and the HV supply, spark gap 
and C1 could also be outside the vaccum - wires through the chamber walls 
sealed up nice and tight.
With no air for a 'core' would there still be streamers off the toroid, 
same length and brightness as there would be for the same coil if it was 
without the vaccum chamber?
---------------------------------- 
Brian Hall
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