The power supply has four components. It is basically an alternator driving a step up transformer. The other two components are a power source for the rotor and a relay/breaker box for the alternator output. One of the reasons for building the power supply this way is to isolate the experiments from the power lines. If that is not done it would cause a lot of RFI and other electrical noise to be transmitted into the power lines. A conventional power supply of this capacity would be expensive and would tend to break or blow up when overloaded. Overloads are expected to occur due to HV arcing.