The Protasis HVPS-1200 High Voltage Controller is a sophisticated, programmable power supply used to create electric field gradients within a dynamic focusing chamber.  It features eight independent +/- 150 volt power supplies.  With the cathode normally wired to the electrode closest to the chamber inlet, the remaining power supplies are normally wired in series to create up to +/- 1200 volts on the farthest anode near the chamber outlet.