Re: [TCML] high frequency wave propagation along secondary coils

[paul <tcml88@xxxxxxxxxxx>]

Steve Ward wrote:

> During a ground discharge, the voltage at the topload
> has been measured to collapse within 100nS (worst case)
> and 250nS (more typical).

> ... during this event is a wave front propagates down from
> the top of the coil.

> ... the capacitance from end to end of the secondary
> (including the capacitance from the topload to the coil)
> should essentially provide dispersion, making this
> wave-front not so steep,

Yes dispersion spreads the down-going transient although
it could still build up quite a high volts/turn near the
base.   This has been discussed before as one possible
cause of racing arcs.  Here is an animation of secondary
voltage distributions (July 2009, modeled on Marco
Denicolai's Thor system),

  http://abelian.org/tmp/thor.anim1.gif

A normal ring-up of the secondary occurs until at 40uS
the topload is suddenly and completely discharged to
ground.

A slow-mo of the discharge,

  http://abelian.org/tmp/thor.anim2.gif

> During testing, our rig got rained on by a leaky roof.

> ... to bake out the water from the remaining coils
> involved applying about 660W of power  ...

>  Upon disection of the coil that had the bottom winding
> fail, we found the wire was separated from the PVC form.

I guess this is a more likely explanation for the fault.

--
Paul Nicholson
--
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