From: Paul
Date: Wed, 20 Dec 2000 18:56:41 +0000
Subject: Re: [TSSP] E-Tesla6.11
I wrote (24th nov): > Terry, you recall I expressed some doubts about the method applied > in E-Tesla6 - I felt that it might not be representing the energy > stored in the internal capacitance. Computers here have been > churning through telescope data, so I've had time to sit back and > work through the math and I'm quite certain now that your method is > correct, providing that is, you calculate Fres by resonating your C > with the right inductance. > The required inductance is the equivalent series inductance (Les), > formed by integrating the EMF induced along the coil, Terry wrote: > Oh good! The capacitance should have been right. > You had me worried ;-)) This might make more sense now in the context of pn2511. The relevant equ is 8.4, although you'll disagree with paragraph which follows, since you've found a way to estimate Ces without knowing omega in advance! Your Lfac is Les/Ldc and I'm looking forward to generating a database of Lfac values when we run the simulator across the range of secondary designs. Remember that the contribution of internal capacitance is represented in a 'hidden' form in the value of Lfac, so it is accounted for indirectly. In a slight revision to pn2511, I replaced the sample equivalent reactances at the end of section 8 with the values for your bare coil, since your larger h/d demonstrates better the difference in value between the 'ee' and 'es' reactances. Take them as approximate, say 5%, since the physical capacitance matrix came from the new program and is not quite right yet, as you can see by the Fres. E-Tesla should deliver the Ces value or near. The new pn2511 is v0.1b. Cheers, -- Paul Nicholson, Manchester, UK. --
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.