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Re: Optimal Quenching

Subject: 
            Re: Optimal Quenching
       Date: 
            Mon, 24 Mar 1997 11:31:36 +1200
       From: 
            "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
Organization: 
            Wellington Polytechnic, NZ
         To: 
            tesla-at-pupman-dot-com


Hi Mark,
           I was interested in this comment (reformatted)....

> Note that as coupling increases, the frequency splitting gets
> worse, and the higher frequency harmonic becomes higher in relative
> amplitude as coupling gets tighter.  For this coil system, critical
> coupling occurs at k=0.011, using the circuit resistances above. 
> This is a really low value, but may be typical of a practical coil. 

All my successful coils have k at least an order of magnitude greater 
than kc (unloaded). The only time I tried to make k = kc The system 
couldn't issue a discharge.

> The gap resistance is probably underestimated, and is proably not
> constant during a discharge cycle unless it can be quenched very
> rapidly.

According to my measurements, Rgap is roughly linearly proportional to 
current. Since primary current is varying sinusoidally, it may be 
that Rgap is varying sinusoidally as well? Maybe not - it might 
depend on the rate of ion dispersion. However, that linear decay is a 
dynamic measurement. There is of course a constant voltage drop 
factored in but this is insignificant until Vp reaches a low value.

    Also noted in measurements was that relative amplitude of Fhi and 
Flo is heavily dependent on pri-sec tuning. Might get busy in the 
Easter break with the storage scope.

Thanks for taking the time to have a look,
Malcolm