What type of oscillator or inverter to use?

I need to build a DC-DC converter which ramps up a 12V battery to 1kV. What type of oscillator or inverter should i build that will create the greatest AC power output?

I can only use transistors, inductors and capacitors in this circuit. I CANNOT use microprocessors or timers.
Update: All i need is to create AC current. I'm just going to run it through a transformer, then a voltage multiplier to bring it back to DC.
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