High power generator and method of supplying high power pulses

A high power (HP) generator includes a plurality of low power (LP) generators, a coupling in which the LP generators are electrically connected, and a control unit. During operation, a coupling-value at an output of the coupling is higher than an LP-generator-value at an output of one of the LP generators. The control unit is configured to select a contribution of each LP generator in order to generate a rise and/or a decay of a pulse at the output of the coupling. At least one LP generator includes an LP-generator-value limiting circuit. The LP-generator-value limiting circuit includes at least one of (i) a series circuit of a diode and a capacitor configured to clamp an overvoltage present at ends thereof, and a discharge circuit to discharge the capacitor, or (ii) a resistor and a switching element, or (iii) a variable electrically controllable impedance with a power dissipating part.