Analytical and numerical analysis of energy recovery systems for neutral beam injectors

In the next generation of Tokamaks, efficient neutral beam injection using positive ion beams, will require direct energy recovery of the residual charged beam fraction. Numerical and analytical calculations are presented on two different recovery schemes: the individual beam let system (system A) and the combined ion deflector - electron - suppressor system (system B). The performance of these systems are analyzed with respect to power handling capacity and efficiency. The power handling capacity of system A seems higher however this system is only efficient with very low divergence beams. System B offers less constraints