From: Bert Hickman
Date: Thu, 05 Aug 2004 09:12:23 -0500
Subject: Re: [TSSP] Secondary dynamic Efield
Hi Marco,
The approach looks like it should work as long as the resistor divider
develops no solution density gradients and as long as space charge
from nearby streamers can be insured to have minimal disruptive effect
on the E-field between toroids. The first condition is probably a
minor problem if you use a very dilute CuSO4 solution. The second
problem should be minimized by artificially enhancing the E-field in a
region of the lower toroid so that streamers are initiated and
directed in a horizontal or downward direction perhaps using a sphere
with a smaller ROC as a calibrated breakout point. Assuming that the
space charge effects can be minimized, it will be quite interesting to
see if the bandwidth of the divider can be increased to cover
breakdown events in the 5-10 nSec arena.
Good luck,
-- Bert --
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Denicolai, Marco wrote:
> Hi Malcolm,
>
>
>>If not there then where?
>
>
> On the top of the toroid
>
>
>>Anything external is going to
>>distort the external e-field sin't it?
>
>
> Yes, but we can pre-distort it in a known way.
>
> Ok, I'll explain.
>
> Even if the water column divider (I suppose you are now familiar with
> what I'm trying to build) was hanging 50 m from any grounded point, it
> would be self-compensated (my target) only if the Efield from top to
> bottom is constant.
> The other way round, even if it was sitting on the floor, it would be
> compensated if I could make the Efield constant all over it's height.
>
> A third possibility is to vary the water column resistance according to
> the changing Efield.
> Imagine a tube full of water hanging from the roof, one end touching the
> TC toroid (3 m height), the other end at 6 m height connected to a
> grounded toroid. A probe hanging from the roof enclosed between two big
> toroids.
>
> Now, the Efield is higher near the TC toroid, decreases up to 1.5m and
> then is almost constant. We just build the first 1.5 m of the probe with
> tube of growing inner diameter. We thus achieve R*C=constant that is the
> target for a compensated resistive divider.
>
> I reached a good compromise using 5 different tube sections, from 50 mm
> to 70 mm inner diameter. I've got field simulation of the whole TC,
> probe and toroids and they look so good that we are really going to
> build this thing, starting from 2 weeks from now. I'll be next week on
> vacation so nothing will happen then.
>
> To have an idea look at:
>
> http://www.iki.fi/dncmrc/work/field.jpg
> http://www.iki.fi/dncmrc/work/profiles.jpg
>
> You can see there the Efield (in color), the equipotential lines, the
> Efield curve along the probe height (when the probe isn't there) and its
> approximation (the stepped curve) when the probe is in place. The probe
> ratio is about 1:600.
>
> Best Regards
>
>
> .
>
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.