Re: Fwd: RE: [TCML] Rotory STATIC Gap

[bartb <bartb@xxxxxxxxxxxxxxxx>]

I wrote:
> I see the possibility that it was arcing to the copper ring, even a 
> 2.5" distance.
Scot, if I use JAVATC's static gap electrode evaluation for your tranny 
(28.8kV/695mA), the best geometry to use to represent that actual would 
be "flat". In that case, with 2 electrodes of 3/16" diameter at a gap 
distance of 2.5" apart, then a voltage of 43kV is needed to arc the gap. 
Considering your peak charging voltage was about 41kV (simple tranny 
specs), then you certainly could have been arcing that distance (and 
probably were).

The arc voltage predicted is based on the field strength and geometry of 
the electrodes. Field Strength is from the web site of Jim Lux (and 
supported by many papers on the subject) and the geometry portion which 
uses this field strength within it's equations are from the Los Alamos 
National Laboratory's report "High-Power Microwave-Tube Transmitters, 
chapter 7, by William North".

Javatc simply plugs in the numbers, and 431kV was spit out based on the 
above works. It's in the ballpark even for an "out of the ordinary 
case", which is pretty cool.

Take care,
Bart


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