Re: slow-wave helical resonator

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>" <davep-at-quik-dot-com>

Tesla list wrote:

> Original poster: "Gary Peterson by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <glpeterson-at-tfcbooks-dot-com>
 
>>>>. . . what is meant by a 'slow-wave' resonator? . . .
 
> I would appreciate the list's critical comments regarding the accuracy of
> the following definition:
 
> slow-wave helical resonator
> A resonant circuit consisting of a single-layer cylindrical inductor wound
> in the form of a helix, usually including capacitive end loading.  The speed
> of a wave disturbance along the axis of the helix is significantly less than
> the propagation of an electromagnetic wave in free space.  A Tesla coil's
> secondary and a magnifying transmitter's base-driven extra coil can both
> behave as a slow-wave helical resonators, the latter propagating the wave at
> around 17% the speed of light in free space.

	If i were writing it, i would omit the '17%' as that is
	like geometry (aspect ratio dependent), arguably adding
	something like, roughly:
		The propagation velocity will vary with the
		aspect ratio, 'thinner' coils being
		slower.  For aspect ratio of 'foo'
		velocities of 17% are typical.
	(adjust values to suit reality....)

-- 
	best
	dwp

...the net of a million lies...
	Vernor Vinge
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	-me