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Re: 3MV/meter




The spark length with a marx charged to 60kv X 10 stages (600kv erected)
(.28uF/stage) was 33" between sharp points (#10 wires) maximum.
The spark length becomes very nonlinear between points as voltage is 
increased.
Barry

 ----------
|From: "tesla-at-poodle.pupman-dot-com"-at-PMDF-at-PAXMB1
|To: Benson Barry; "Tesla-list-subscribers-at-poodle.pupman-dot-com"-at-PMDF-at-PAXMB1
|Subject: Re: 3MV/meter
|Date: Saturday, September 28, 1996 3:22AM
|
|<<File Attachment: 00000000.TXT>>
|From MALCOLM-at-directorate.wnp.ac.nzFri Sep 27 21:57:14 1996
|Date: Fri, 27 Sep 1996 17:46:46 +1200
|From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
|To: tesla-at-pupman-dot-com
|Subject: Re: 3MV/meter
|
|Hi all,
|        I have been using single shot methodology for measuring coil
|parameters and performance for several years now. In fact I used it
|to get the primary Q measurements which should be posted soon. With
|a cap voltage of 12kV on the coil in question I can get a single
|solid channel spark 17+" long to a discharge rod (Ecp about 7.2J).
|I have serious doubts about 3MV/metre though. The Ctot of the
|secondary of this coil is 26pF. Ignoring gap losses, the best it can
|theoretically do at this energy level is 744kV. The spark length
|according to my rule of thumb of around 35kV/inch is about 600kV at
|this energy. That seems reasonable considering the secondary only gets
|one ringup under these conditions.
|
|Richard wrote....
|
|> There was an old article By DC cox in a TCBA NEWS of yesteryear.  In this 

|> article he suggested single pulsing a Tesla coil to determine the actual
|> voltage output.
|>
|> He recommended DC charging of the normal tank capacitor and single firing 

|> the system.  The resultant non-ionic spark length would represent the
|> actual output capabilities.
|>
|> I have thought this out a bit and if you were to just align you gap for
|> normal presntation with air flow or whatever quench method you use, and
|> apply any DC voltage which will charge the cap to its air break over
|> point in the gap, it will fire as a close analog to real operation.  Next 

|> a grounded object which is relatively flat should be moved in or out from 

|> the toroid (which has a moderately pointed object on it (the capacity
|> will not assist in single shot storage).  Room lights should be out or
|> very dim.  At the point where a true streamer arcs (not just a brush
|> connect), this is the output of you coil based on the DC, 3 megavolt/
|> meter, air breakdown rule.  It is important to closely mime the real
|> conditions of your coil system to make this really hold.
|
|<snip>
|