Re: [TCML] Re: Position of baffle inside secondary

[Paul Nicholson <tcml88@xxxxxxxxxxx>]

A vivid description DC.  But it fails on one crucial point to
account for the breakdown.

Yes, the frequencies separate further as k increases, but both
'modes' have their voltage maxima at the top. It is necessary
to invoke other - higher - overtones to introduce peaks along
the coil itself.   So the picture of the two fundamental
modes interfering to produce a breakdown someway below the
top doesn't work.

My feeling is that your description survives, but involves
the higher overtones, excited by the irregular load.

Q. Can racing arcs occur on a coil while it is not breaking out?

The reason I ask is that high-k alone doesn't seem to produce
enough overtone energy to cause breakdown.  Does it need the
non-linearity of a spark loading to scatter enough energy
into the overtones of the coil?    Given sufficient overtone
activity, there would be temporary voltage peaks occurring
all over the coil, continually moving around as the overtones
momentarily add their voltages at various times and places,
perhaps giving the 'racing' effect.  Picture a voltage
distribution like a cross section through a choppy sea.

This would seem to need a non-linear load, unless the coil
was already very close to its breakdown limit anyway and the
small amount of 3/4 wave present with normal coupling is
enough to take it over the edge.

Capturing of base current waveform on a racing coil would
settle the matter - overtones are very clear in the base
current waveform (not so easy to see in the top volts signal).
--
Paul Nicholson
--
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