Alternatively, you could look at a voltage multiplier circuit - this is probably the simplest and cheapest way of obtaining kilovolts at microampere currents. I made one many years ago to power a laser (admittedly only several kV, not 100 kV) and it was quite simple and effective. See:
Not only will the components have to be rated at the right voltage, the physical construction will have to be very special indeed. Roughly, the breakdown voltage of dry air is about 30kV per centimetre So the hi voltage connections will have to be 4-5cm apart and away from any other surfaces. The old adage "It the volts that jolt and the mills (milliamps) that kills" is true but the jolt from 100kV won't do you any good at all.
I don't want to cause any offence, but to be honest this is one of those questions where if you have to ask how to do this, then you should possibly not be doing it.
If you are determined, I would certainly suggest you build a lower voltage one first and learn about some of the problems.
Measuring and characterising what you have built will also be non trivial and liable to kill test equipment without suitable precautions.
Ditto. In addition corona discharge will be a major problem. I built a 50KV multiplier diode tester for [a TV maker] and had to make all circuit nodes from large spheres to control it.
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job is much easier if you have a metal lathe to turn the shapes.
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Suitable wire doesn't just have thick insulation, there is a semiconducting sheath around the copper to reduce the voltage field gradient.
I don't think this will be "on the safe side" of anything unless you are familiar with working with these voltages and take appropriate precautions. The tone of the question does not imply familiarity.
A neon transformer is rated at several milliamps or more and a sure way to kill yourself unless you are familiar with hv technology and very, very carefull. One hand behind the back when making *any* live adjustments etc and don't work alone.
I tend to use Cockroft Walton multipliers to generate hi voltages. Start with as long as required, 1" wide glass epoxy base, with each diode and cap in a zig zag pattern along the length of the strip, using stake on vero pins or similar. Google C/W multiplier to see how it works etc. The nice thing about this method is that each diode and cap only need to withstand approx (Vout / number of stages) voltage, so you can use off the shelf silicon diodes and low cost polypropylene caps. Spray with silicon grease, dry, test, then perhaps encapsulate in your favourite hv compound...
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