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Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
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Posts: 874
Hi I was wondering if you fire a electron at polythene or something on the triboeletric series will it build up static charge. Would it continue build up charge or stop at the accelerator voltage.
Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
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Posts: 837
The second question is more difficult to answer than the first AFAICS.
In the first case it will stop at the accelerator voltage, the electric field of the insulator will decelerate the electrons before they get to it.
In the second case it's akin to a VDG and it becomes a lot harder to predict, depends on the force the moving air can push the electrons with, hell if I know.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Pinky's Brain wrote ...
In the second case it's akin to a VDG and it becomes a lot harder to predict, depends on the force the moving air can push the electrons with, hell if I know.
I'm of the opinion that, in the second case, you won't build up much charge at all, because as soon as there is a charge on the target it will start repelling any further electrons (You'd need one hell of an airflow to get the electrons up to 30keV)
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
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Thanks you two. Was thinking about moving the pickup electrode as well as the air moving, like a helicopter blade. Should be getting some hv diodes and caps in the mail and will try this out, with ignition coil and cw
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Andy wrote ...
I was thinking along these lines in the attachment. A corona gets blowing onto a metal electrode. What voltage would the electrode reach?
You are a person in need of Gauss's Law as it applies to Gaussian Surfaces. Why will the charge continue to accumulate on the outside of a Van der Graaf generator sphere, but not on your electrode?
In the second case it's akin to a VDG and it becomes a lot harder to predict, depends on the force the moving air can push the electrons with, hell if I know.
It is, in principle, possible to shove ions against an electric field with an airflow. For 1kV/cm you'd need air speeds of a few hundred m/s. Creative idea, but probably ranks in the top ten of the most awkward ways to generate high voltage.
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Firing a electron accelerator at polythene
