A system and method for containing plasma and forming a Field Reversed Configuration magnetic topology are described in which plasma ions are contained magnetically in stable, non-adiabatic orbits in the FRC. A clamp is coupled to the first end of the tube. The output module outputs a predetermined value of said variable to a memory location where said variable is stored in said engine control module. To improve uniformity of depth of implantation, channeling effects are reduced by one or more techniques. A processor executes the stored watering program and controls the station module andor the encoder module in accordance with the stored watering program.