Edit: Regarding Rick's circuits, I see no mention of changing the operating frequency and in general I see no parametric components unless the LAB is considered as such.
Thx, PM , I may be in the minority, but I see the disrupted impulses as the source for a parametric variation of inductance. The split-second that the circuit containing an inductance is closed, the only energy that can flow is via capacitive coupling, with the wire presenting as a large impedance. As conventional current begins to flow, the inductance quickly decreases, but some energy may already exist in the circuit when this happens. In addition, the core may be saturating at a different rate as the copper coil itself. Hence, you may get a situation where the inductance and currents are changing at different rates possibly leading to a pumping action. If this were the case, one would expect that extremely sharp, high voltage gradients would improve the effect, and this concept is indeed reflected often in different devices, most notably the Tesla Magnifying Transmitter. But personally I'd rather focus on more intuitive examples. (it's better to understand a combustion cycle engine before working on jet turbines ). Rick may be coming to similar conclusions but from a far less mathematical/ more holistic perspective.
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When you say something is impossible, you have made it impossible
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