The gap current, gap voltage and spark gap current. These factor indicated also in surface quality (Ra) and material removal rate (MRR)

Caution, the discharge current is adjusted according to the impedance of the discharge circuit conditions. How quickly the capacitor voltage is reached (ideally 72% of the maximum capacitor voltage) depends on the charging current of the charging circuit. You should their relaxation generator well know (R, C, Lparasitär), are recognizable to the correct process parameters, which are also independent of each other.

Its depend on your circuit charging or discharging methods, could be constant current or constant voltage methods. if using constant current, the capacitor will charging as linear mode while on voltage charging will have curve before saturate.