Re: "Gas burner" corona from STSG driver

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

Original poster: "Luc by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ludev-at-videotron.ca>

Hi,

I remember seeing old X-Ray tube with 3 electrodes instead of 2
design for AC.

Cheers,

Luc Benard

Tesla list wrote:
> 
> Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>
> 
> Tesla list wrote:
> >
> > Original poster: "Kurt Schraner by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <k.schraner-at-datacomm.ch>
> >
> > John, Gary -
> >
> > To my knowledge, what has been used for X-Ray were induction coils, not
> > Tesla coils. Probably John meant this (please correct me if I'm wrong)?
> > - The design of those inductors took into consideration, to make the
> > secondary sparks voltage-waveform with as low "inverse" as possible,
> > meaning a waveform with high DC part. This is elucidated i.e. in
> > M.A.Codd, Induction Coil Design, E.& F.Spon, London 1922, reprint
> > obtainable by PV-Scientific.
> 
> Early X-Ray power supplies were indeed mostly induction coils, but
> electrostatic machines were also used for some time, due to the
> pure DC output, particularly convenient when the images were
> directly observed through a fluoroscope. Some old texts even say that
> with pure DC there were no problems with "X-ray burns" (they were
> wrong, unfortunately for many experimenters).
> 
> About the secondary voltage with as low inverse as possible, this
> only makes sense as "without inversions before the spark occurs".
> Without sparks (or other nonlinearities) the average output is always
> zero.
> The relatively tight coupling of these coils cause the output
> voltage to rise to the maximum value at the first swing, while in
> a Tesla coil there are always at least one (for k=0.6) polarity
> reversal before the output voltage reaches the maximum absolute value.
> 
> Antonio Carlos M. de Queiroz