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On 2/27/18 11:30 AM, Bert Hickman wrote:
Good ideas. Locating the divider inside the secondary should
significantly reduce space charge effects.
However, a capacitive divider may provide more accuracy than an aqueous
resistor or other resistive divider chain. In fact, HV resistors should
not be necessary for this application since there is no DC component on
the TC output. An AC divider would provides excellent high-frequency
response, it shouldn't significantly reduce TC secondary Q, and the TC
can easily be re-tuned for any changes in TC operating frequency.
Specifically, a series divider chain could be made from small PP film or
COG/NPO Class I ceramic HV capacitors, housed inside a corona-resistant
PMMA or polycarbonate tube, and centered within the TC secondary. The
larger divider output cap is normally connected to the noisy TC RF
ground, so it may be necessary to use a battery-powered buffer and
analog fiber optic transmitter - receiver pair to get a clean output
signal.
Bert
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.
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.
Easy to calibrate over frequency by any of a variety of means
.
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