Not building ATM. Searching for good deals on parts atm.
Need a turbomolecular pump plus a regular (rotary vane, etc. etc. ) pump for my vac source, a big HV capacitor bank, the square magnet wire to rig some sodding big electromagnet coils, power supply I probably have sorted but if the one I have isn't big enough then I can hit ebay for a suitable one.
The electromagnets are probably going to be the most expensive part, or the turbopump, I intend to aim for a meter in diameter at least, for the magnets, an RF source to excite the particle stream (I'm after going for an accelerator of the cyclotron configuration) shouldn't be too hard to come up with. That much copper wire is going to eat a massive hole in my wallet no matter where and/or how I get hold of it.