Simulation of Experiment 24A

Some of my 34  measurements serve for Microsim 8 modelling. The schematics file for the simulation can be downloaded as Induktor24A.sch
Operating the inductor with 8 mm secondary-spark. The sparking time is adapted to the experiment (3.2ms; sorry: no predictive way!). The breakdown voltage of the sparkgap was estimated by a first simulation run without spark (breakdown voltage set to DC=1000kV), then reading the first peak of U2~22.5kV, then setting DC=22kV. The log-decrement of the oscillations is dominated by the value of the "iron resistor" Rfe, which, within reasonable limits, regarding results from 50Hz "transformer tests", was looked at, as a fitting parameter for the damping behavior of the oscillations. The simulation result, giving a qualitatively satisfying representaton of the experiment, is not yet really satisfactory, because of:

1.) Simulated voltage U1 too high ( i.e. U1max = 94V(sim.) vs. 66V(exp.) )
2.) Superposition of higher frequency "ripple" on ringdown (treated somehow in "Theory").
     (however: the small ripple is real: can be observed experimentally at the start of  primary current).
3.) Phase-information of simulation only in raw agreement with experiment.

Simulated Waveform Waveform Photo 33A