Electrostatic Plasma Confinement Fusor

I wish to build a Fusor. Now, in order to build it, a high voltage is required generally achieved through Neon Sign Transformers. If I want to achieve voltages 25 kV or more, how am I supposed to do it? I could possibly use a voltage multiplier but I am not sure if it is a great idea. A voltage multiplier can not provide a very large current, so it may get discharged even before any fusion occurs. What are the other options that I have? Any suggestion is welcome.