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Quench, Coherence etc.


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From:  Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent:  Tuesday, August 11, 1998 10:54 PM
To:  Tesla List
Subject:  Re: Quench, Coherence etc.

Hi John,

> From:  FutureT-at-aol-dot-com [SMTP:FutureT-at-aol-dot-com]
> Sent:  Tuesday, August 11, 1998 8:09 AM
> To:  tesla-at-pupman-dot-com
> Subject:  Re: Quench, Coherence etc.
> 
> In a message dated 98-08-11 00:41:06 EDT, you write:
> 
> <<> > >          - 8 gaps : quench always 1st notch. Spark 10.5" for 20% of
> > > >            shots - yep, it decreased.
> > > 
> > > That last part is _very_ interesting... did anything else change?
> > > When you changed #gaps, do you think that the effective firing voltage
> > > might have decreased?
>  
>  >No. The gap was set accurately to fire at the same voltage for each 
>  >test. The adjustability is proving to be extremely useful. Of course 
> > the beating disappeared with the attachment. Those beat patterns were 
> > for corona.
>  
> > > Even with 8 rotating gaps in series, Electrum usually quenches 
> > > on the 2nd notch, and 1st for gnd strikes.  Could the arc dynamics 
> > > possibly prefer a beating secondary?
>  
>  > I think so and there appears to be a good reason. I posted another 
>  >note on this.  This note was hacked off at the end by the server here 
>  >BTW. An addendum has been posted. Primary Q plays an important part 
>  >in this.
>  
>  >Cheers,
>  >Malcolm
>   >>
> 
> Hi Malcolm, 
> 
> Was the test above that gave shorter sparks at first notch quench the
> same one that showed identical ring up amplitudes for the first and
> second notch quenchings (from your other post)?  This would suggest
> that the greater
> number of gaps is not noticeably increasing the gap losses, and also
> suggests that the long drawn out beat pattern type spark energy feeding,
> *is indeed* increasing the spark output lengths.  
> 
> But if long beat spark feedings are helpful, then this would suggest
> that even poorer quenching would be even better?  Yet this doesn't
> seem to be the case (?)  
> 
> Regards,     John Freau

For attached sparks where all quenches are basically equal I think 
gap loss is the only factor that differs. A more definitve test is 
order. At least it seems to be a good idea not to have too many gaps.
    At least one useful thing is coming out of this. If a small to 
medium sized system is required as a finished article, I now have the 
capability of formulating the best gap once the coil is built and 
then simply building a finished gap to spec.  More this weekend.

Regards,
Malcolm