From: "Terrell W. Fritz"
Date: Sat, 26 May 2001 18:58:01 -0600
Subject: Re: [TSSP] Toroid field stress
At 08:48 PM 5/26/2001 +0100, you wrote: >Terrell W. Fritz wrote: > >> I set it up and ran it and got 9200 Volts/cm with 400kV on the >> toroid. > >Yes, I guess the increase in chord diameter is reflected in the >reduced stress. > >> That is a little short of the 26kV/cm we were looking for. > >Needs over 1.1MV to breakout, which is obviously wrong. > >> I have not used the stress stuff much but I think it works properly. > >I think so too - the caps come out right, so the field can't be out >by a factor of nearly 3. Since the capacitance is independent of voltage, there is a chance I have a scaling error somewhere especially when using the little tested metric dimensions. I really should look at the voltage data (sure its right) and be sure the point to point voltages agree there with the stress data array and with the overall dimensions. > >>... Or the grid is too choppy to show the actual tiny stresses at the >> surface. > >Maybe. Wonder how smooth > > http://www.saunalahti.fi/dncmrc/th-hut3.jpg > >actually is? Would only take one irregularity, an edge somewhere. I reran it with a 600 array size and got 10.2kV now. Hmmm. Since that took four hours if it is a problem with a course grid, I'll never get there... > >Guess we'll have to look at a few more coils, see if a pattern >emerges. We know a 1 meter (radius) sphere breaks out at 3MV. So It has to be somewhat close to 30kV I would think. I have a 50kV DC supply but I'll have to see if I have any small spheres around. This one is too big :-)) http://hot-streamer.com/temp/Orb.jpg Cheers, Terry > >Cheers, >-- >Paul Nicholson, >Manchester, UK. >--
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.