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Re: Primary Q's and Spark Gaps

To: teslaatgrendel.objincdotcom

Subject: Re: Primary Q's and Spark Gaps

From: EDHARRISatMPS.OHIOSTATE.EDU

Date: Thu, 07 Dec 1995 14:24:06 0500 (EST)

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Ed Philips wrote:
the response and inverting the above expression to get the
equivalent value of k. Note that, as long as k*Q is much above 3,
the timing depens on k only, and not on Q. By the way, running the
same SPICE simulation made it obvious that one would like much
higher values of k than you might expect from critical coupling,
which gives the maximum gain when the primary is fed from a current
source such as a vacuum tube. The simulation I ran charged the
capacitor to a fixed voltage and then discharged it into the primaryh
winding.
********************************************************************
Hi Ed,
I also ran some simulations and found that going beyond
critical coupling gives much better efficiency. Although there are now
two frequencies, efficiency is improved for k>kc. One of course would not
want to go to k=1 since all the resonant voltage gain would be lost. You
may be interested some papers/book which cover the Q,k parameter space for
pulse discharge circuits:
High Voltage Laboratory Technique  JD Craggs and JM Meek
Design Charts for Tesla Transformertype relativistic electron beam
generators  H Matsuzawa and S Suganomata
Review of Sicentific Instruments Vol53 No5 May 1982 p694
A Tesla transformer highvoltage generator
CR Hoffmann
Rev Sci Instr Vol46 No1 Jan 1975 p1
Transformer type accelerators for intense electron beams
EA Abramyan
IEEE Transactions on Nuclear Science, NS18 p447 (1971)
Ed Harris