P2-22: Design of multistage depressed collectors using 3D conformal finite-difference time-domain particle-in-cell simulations

The feasibility of designing a multistage depressed collector using conformal finite-difference time-domain particle-in-cell simulations has been studied. A feedback mechanism is implemented to provide stable time-dependent voltages for each stage of the depressed collector. An arbitrary space-time dependent spent beam distribution can be given in our time-domain simulations. We demonstrate the design of a five-stage depressed collector recovering a triangular spent beam distribution achieving an energy recovery efficiency of 70%.