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Re: Overcoupling?

At 09:53 PM 5/4/99 -0700, you wrote:
>Terry Fritz wrote:
>
>> >       The corona area you mention is probably a natural high field 
>stress area
>> >that linear wound Tesla coils have about 2/3 up the secondary.
>
>Why? 
>
>Frequently I see the term "overcoupling" in this list, but can't see
>what it means. I don't see a reason for increased voltage gradients
>along the secondary just because the coupling coefficient to the
>primary is increased. A primary closer to the secondary would induce
>sparking between the two coils, certainly, but why sparks along the
>secondary? Would not this effect be due to tuning to a higher order
>resonance mode instead?
>
>Antonio Carlos M. de Queiroz
>
>

	If one maps out the high voltage fields around a TC secondary,  There
occurs a bit of a high field stress point that is simply a result of the
increasing voltage along the length of the coil.  It is not very sever but
does always show on stress plots.
	I too wonder why overcoupling causes the racing arcs along the secondary.
Perhaps this is already known and someone else can explain it??  If not
perhaps a little investigation is needed.  This is one of those things I
always wanted to work on but have not gotten to yet...

	Terry
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