From: "Denicolai, Marco"
Date: Thu, 5 Aug 2004 15:05:17 +0300
Subject: RE: [TSSP] Secondary dynamic Efield
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 ----------------------------------------- ============================================================ The information contained in this message may be pr rotected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any reproduction, dissemination or distribution of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by replying to the message and deleting it from your computer. Thank you. Tellabs ============================================================
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.