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Re: Fw: Arc Impedance Study - Computer Models



Hi Barry,

> Original Poster: "B**2" <bensonbd-at-erols-dot-com> 
> 
> Hi Malcolm,
>     Fr and k limit the speed agreed.  The surge impedance limits the
> amount of the delivery.  The higher Xp is the lower the primary losses
> agreed.  As the surge impedance goes up the current peak goes down,
> the energy lost in the spark gap goes down,  and the peak energy in
> the primary circuit decreases.  The peak energy in the tank scales as
> the square of the peak current.  The peak spark gap energy loss scales
> as an inverse 0.67 power of the peak current.  The net energy in the
> tank deliverable to the secondary, with loss to the spark gap,
> increases as the surge impedance decreases with the frequency kept
> constant.

Not sure I entirely agree. Tank energy is defined by what was 
originally in the primary cap isn't it? If one starts with the same
amount of energy and uses a high surge impedance in the tank there 
has to be more energy transferred to the secondary if k and Fr remain 
the same since tank losses are lower (Y-N)?

>     To transfer maximum energy to the streamer in minimul time the
> tank surge impedance should be equal to the impedance of the streamer
> reflected into the primary tank, should it not?

But the streamers don't really start until a transfer is near 
completion in most systems in which case the secondary and its 
topload are the source of streamer energy (Y-N)?

> Since the streamer impedance changes with time should not the primary
> tank capacitor also change with time?  How would one do such a thing?

But are you matching a tank capacitor with the streamer? Indeed, are 
you matching the conducting gap with a streamer? I used to wonder 
about both of those things until experiments showed that they don't 
really play a part once energy is in the secondary. Whether the gap 
quenches at that point or not then depends on (a) whether one can 
make it do that if output streamers are weak or nil and significant 
energy remains in the secondary, or (b) it going out anyway 
as a strong streamer sucks most of the energy out of the secondary.
The comparison between a TC and continuously loaded double tuned 
transformer in a radio set is weak for a number of reasons, not the 
least of which is the transient nature of the load in a TC.

?
Malcolm 
<snip>