Re: HV MMCs was Re: Magnifier conversion

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>

Hi Jim,

The cap leads are actually in a spiral.  My 2-D layout drawing does not 
show this well at all.  The drawing is just to define basic dimensions.  I 
could do an "X" pattern of the small caps to get rid of the inductance, but 
that would defeat the "ring" on the outside of the column that avoids sharp 
voltage breakout points.  I think the spiral with a large outer radius of 
curvature is needed to keep the thing from breaking streamers out 
especially near the top.

Since this thing is starting to look like a reasonable HV probe too, that 
inductance thing may indeed be a big deal.  I did not think this capacitor 
would be a giant project, but maybe a little thought would really be of 
great use here!

Your thoughts?

Cheers,

         Terry

At 03:36 PM 4/16/2003 -0700, you wrote:


>>If it is 3.5 inches in diameter, 19 inches long, 25 turns...  We can 
>>maybe guess at an inductance of 9.3uH (wheeler's).  that gives a 
>>resonance of 4.5MHz.  I "should" be ok ;-)   A "counter winding" to 
>>cancel the inductance is a cool idea!  But should not be needed.  We'll 
>>see.  Be fun just to try if the voltage across it was not to great.?
>
>If you've got all those caps arranged in rows, I'll bet you could come up 
>with a clever sequence to wire them in that effectively cancels the 
>inductance. Each cap is only 2kV or so..  Maybe something where instead of 
>wiring 1,2,3,4,5,6,7,8, you wire 1,3,2,4,.... with HV wire across the 
>center of the stack...
>
>Say the caps are arranged like:
>
>
>