## 3 Results  
The constructed prototype of the high-voltage pulsed power supply, implementing SiC technology and the Tesla coil-like transformer design, is depicted in Figure 8.  
All of the waveforms presented below were recorded using the LeCroy WaveRunner 6100A digital oscilloscope. The voltages on C\({}_{1}\) and C\({}_{2}\) were measured using a passive Tektronix P5100A probe, and the currents on L\({}_{1}\) and L\({}_{2}\) were measured using LeCroy CP031 Hall effect current probes. The output voltage was measured using a passive Tektronix P6015A high-voltage probe. The current on the primary and secondary side of transformer was measured using a type 6585 current monitor by Pearson. Figure 9 presents voltage and current waveforms for C and L elements of the resonant capacitor charger unit. The presented waveforms were recorded for 400 V of input voltage and under high load conditions. The charging process started at time zero, just after the previous output pulse generation  
Figure 8: (**a**) The constructed high-voltage power supply prototype and (**b**) its main internal components (equivalent circuit component names). Figure 7: (**a**) The S\({}_{3}\) switching module (8 IGBTs (Isolated Gate Bipolar Transistors) and 8 SiC antiparallel diodes are under the copper busbar visible at the top); (**b**) the C\({}_{3}\) output capacitance. process was finished. During normal operation, the initial voltage across capacitor C\({}_{2}\) did not drop to zero because the unused energy from the output pulse generation process always recharge it. To charge the capacitor C\({}_{2}\) from 0 V to its final voltage (400 V) 30 repetitions were needed, while in normal operation (under lighter loads), the typical number of repetitions was around 15-20. In the worst case (the lowest initial voltage of C\({}_{1}\) and highest amplitude of inductor L\({}_{1}\) current) the efficiency of energy transfer from DC voltage source to capacitor C\({}_{1}\) was above 98%. With the same efficiency, the energy was transferred from capacitor C\({}_{1}\) to C\({}_{2}\). The overall efficiency of the resonant capacitor charger unit was typically higher than 96%. Figure 10 shows voltage and current waveforms of the output pulse shaping circuitry. The waveforms were recorded for 300 V of input voltage (for higher voltage values, energy consumption in the load significantly affects current waveforms). The process started at time zero, when the capacitor C\({}_{2}\) was charged to its initial value. After switching S\({}_{3}\) on, the energy stored in capacitor C\({}_{2}\) was transferred through the transformer's magnetic circuit to the capacitor and parallel-connected load, either a DBD or PCD reactor. For 400 V of input voltage, the amplitude of the generated high-voltage pulse was around 20 kV, due to the high transformer winding ratio (n = 50). Any energy which was not consumed in the load for gas ionization backflowed to capacitor C\({}_{2}\). Figure 9: The measured voltage and current waveforms of capacitor resonant charger (measured at main L and C components—refer to Figure 2). For an ideal circuit, the current pulses should be quasi-sinusoidal. Distortions, especially visible in the current of the primary side of the transformer, were caused by the parasitic capacitances of transformer windings [17]. The energy transfer efficiency from C\({}_{2}\) to C\({}_{3}\) was above 84% and, therefore, the whole process of output pulse generation (energy transfer from C\({}_{2}\) to C\({}_{3}\) and back from C\({}_{3}\) to C\({}_{2}\)) was achieved with an efficiency of about 71%. To test the prototype in real application conditions, two types of loads were used. At first, a PCD reactor was created as a matrix of HV electrode needles above the low-potential flat metal plate. The electrical capacity of the reactor was 27 pF. Figure 11 shows the typical discharge formation during operation. Figure 12 shows the typical voltage and current waveforms of a PCD reactor discharge and calculated power and energy applied to the load.