In principle, the choice of your pulse frequency and C 1 is very important. The pulse contains an alternating current component. C 1 is not only a filter for storing energy, but also a load, which will absorb energy. The narrower the pulse, the more high-frequency components, the smaller the capacitive reactance, the greater the energy consumed and the lower the voltage. You can do experiments and change the capacitance of the capacitor, and the result will change. Just try it.