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jimlux wrote:
<snip>
yeah, but I think any reasonable capacitance will be larger than the top
load capacitance, and will load the coil. Say you want a 10,000:1
divider to get 500kV down to 50V. The 50V part has to be, say, 10pF, so
the 500kV part is 10pF/10,000. So you'd need a 100 of 0.1 pF
capacitors in series? And what would those look like? Is this even
available.
A hundred 1000pF 7kV or 10 kV radial-leaded ceramic NP0/C0G caps in
series would "look" like ~10 pF of loading to the TC while providing
sufficient voltage margin for 500 kV(peak) output. Using a bottom cap of
100 nF would provide a 10,000:1 divider ratio. Using smaller value caps
on the divider chain would correspondingly reduce TC capacitive loading
to perhaps only a few pF. It should be a reasonable approach from a
component standpoint/
However, preventing corona and flashovers across the divider chain or
from end to end inside of the TC coil form may be a bit of a challenge.
The HV output and ground are normally never brought INSIDE the coil form
for this reason...
I think, ultimately, a good capacitive e-field probe is the way to go.
The probe is 1 plate (which effectively sits at "ground" potential) and
the top load is the other plate of the capacitor.
I agree - as long as there are no streamers.
Easy to calibrate over frequency by any of a variety of means
.
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