For long bursts feedback is probably necessary. In my no-feedback coil I see that the current rises above the designed limit of the first current beat when streamers appear. A combination of resistiveand capacitive loading (detuning), probably.
Yes, measurements indicate that capacitive and resistive arc loads are roughly of equal magnitude, i.e. a phase lead of about 45 degrees of arc current to arc voltage. For fast growing arcs it is more like 60 degrees.
My idea of a "perfect DRSSTC" would be one using a large primary inductance, which could store a lot of energy for a given max primary current and a corresponding long burst time to charge it up. That would reduce stress on the transistors. Most of this isLarger primary inductance reduces the primary current, but reduces the maximum output voltage too. Probably, once a certain voltage is achieved bursts length can control the streamer length. Again the question that I never saw properly addressed of how much voltage you need at the outputunexplored territory.of a Tesla coil.
Maximum output voltage is not necessarily decreased. More energy in the primary tank leads to a higher magnetic field if the geometry isn't changed. That would imply more secondary voltage. The question of arc length versus voltage is indeed difficult. Arcs of shorter duration need more voltage for a given length. Also I believe, that higher TC frequencies require less voltage but more power. Udo _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla