Re: Gap Losses

From: 	Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: 	Wednesday, August 27, 1997 1:11 AM
To: 	tesla-at-pupman-dot-com
Subject: 	Re: Gap Losses

Hi all,
            Greg asked....

> From:   Greg Leyh[SMTP:lod-at-pacbell-dot-net]
> Sent:   Tuesday, August 26, 1997 1:45 PM
> To:     Tesla List
> Subject:    Re:  Gap Losses
> Richard Hull wrote:
> > As regards what is the optimum surge impedance..... I honestly believe it is
> > like everything else in this messy business...firmly planted in ever
> > shifting sand.
> > 
> > It is part of the art.
> > 
> > A question to your question what is really high? ...Low?  It is as much
> > power related (relates to frequency too) as to some magic number. You
> > effectively said this earlier.
> Well, I know that 5.3 ohms is too low for a 4-gap rotary, and I suspect
> that 50 ohms is pushing the high side for most gap systems, even the ones
> with a zillion static gaps in series.  My rule of thumb at this time is:
> Zchar = 4 ohms X number of series gaps in primary switch.
> I would be interested to know where yours (and others) Zchar values fall,
> for your favorite 2-coil systems.

My mini coils with the first transfer loss reported had Zp on the 
order of 50 Ohms. I am shooting for 100 Ohms in a new design I have 
been commissioned to build for display purposes.