Re: [TCML] Maximum Field

[Jim Lux <jimlux@xxxxxxxxxxxxx>]

On 12/21/12 2:53 AM, Cole Awesome-Jordan wrote:
> Im trying to design a primary coil with a "maximum electric field", how
> would you create a stronger electric field then normal?

Electric fields are measured in Volts/meter, so it's all about the geometry.

That is, if you have 100kV, and two big plates a meter apart, you are at 
100kV/meter.. if they're a centimeter apart, it's 10mV/meter

But as soon as you get away from infinite flat planes, calculating the 
electric field gets a bit tricky

If you have a conducting sphere in free space, the charge will be evenly 
distributed on the sphere, and the electric field *at the surface of the 
sphere* will be V/radius:  a 30 cm diameter sphere with 150kV on it is 
150kV/0.15m = 1MV/meter.


If you look at http://home.earthlink.net/~jimlux/hv/rogowski.htm you 
will see an example of an electrode profile that is designed to have an 
area with uniform field in the middle, and less everywhere else.

as a practical matter, air breaks down at a field of about 3 MV/meter, 
so you're unlikely to get any higher field than that unless you are 
running in an insulating liquid or gas.



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