High Voltage Plasma In Vacuum

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In this video I am using a 15,000 volt 30 milliamp neon sign transformer and connecting it to the electrodes on the sides of my vacuum chamber. Gap is about 7". At atmosphere nothing happens. As I pull down the vacuum you will notice a purple coronal discharge form on the terminals. As the vacuum continues to be drawn down the discharge length increases then starts to reverse itself as the vacuum deepens. Finally, I will shut off the pump and slightly open the relief value allowing the vacuum chamber to pressurize. The plasma arc starts to lengthen until it finally breaks down. (If you GOOGLE Paschen's Law, Wikipedia has a nice chart that shows what happens as you continue to deepen the vacuum [there is a point where if the vacuum gets too deep, it becomes harder to generate the arc])
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