Creedon Machine Applet
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Upon further reflection, there are two solutions of interest... These are the "re-trapping" solution and the steady state solution. The "re-trapping" solution is the result when the forward wave first hits the load but before the retrapping wave goes back to the machine. In a sense, this is the result before the generator is aware of the actual load. Because the retrapping wave velocity is often very slow, this result may be the most useful for actual generators. This result does not lie on the load line. Eventually, after waves propagate back and forth between the generator and the load, the "steady state" solution will be reached. This result does lie on the load line. 27Aug07
Fixed a bug regarding "With Radiographic Diode" results where answer did not lie on the load line 11May07
It is assumed that the source transmission line transit time is much longer than the electrical pulse.
Solver assumes no reflection from self-limited load and MITL has same effective impedance as load. (I think this is usually a pretty good assumption, although not 100% accurate). Undermatched solver assumes a forward going wave in MITL with same voltage as in self-limited case and an MITL impedance equal to the vacuum impedance. (This is probably only a good assumption when very undermatched.)
Sources:
Private communications with Dave L. Johnson and Vern Bailey of Titan, PSD.
Vern Bailey's Beams2004 paper.
J. M. Creedon, Appl. Phys. 48, 1070 (1977).
Creedon JM. J Appl Phys 1975; 46: 2946-2955.
Copyright © 2006-2021 Raymond J. Allen