[TCML] My Hemisphere/Toroid with Unconnected Top Sphere results

[Paul Nicholson]

Peter wrote:
 > with the sphere on top of the hemisphere, ... unconnected
 > ... is most definitely magnifying the output in streamer length

Bart wrote:
 > ...the sphere will only add about 2pF of C when placed on the
 > hemisphere/toroid and will only change Fr a few kHz

Interesting situation.  As Bart says, the change in C and Fr
is small.   The floating sphere must be modifying the field
distribution such that streamer formation is encouraged.

 > If I remove the top sphere or connect it directly (metal to metal)
 > with the secondary

The tuning adjustments reported suggest that the floating sphere is
behaving rather differently than the connected sphere.  The capacitance
calculations refer to a connected sphere only, in which the sphere is
at the same potential as the topload.  Without the connection, the
sphere will float to its own potential - a capacitive divider is formed
and the overall field around the topload/sphere will be different.

This looks like a situation that can be modelled.
--
Paul Nicholson
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