The GEM Supply Unit (GSU) consists of two dedicated power supply blocks: High Voltage Unit (HVU) and (optional) Low Voltage Unit (DCU).

HVU has 7 or 12 independently adjustable high voltage supplies while DCU contains 2 fixed supplies with high current capability.

Outputs of HVU are connected together to form equivalent of voltage divider.

It has special capabilities which makes it specially suited for GEM detectors. All voltages are generated as a sum of voltage sources instead of independent sources used in conventional solutions. This approach enables safe operation of detector as well as precise regulation of inter-electrode voltage instead of absolute electrode value. Moreover, after detection of HVU over-current event it can immediately and safely disconnect outputs, preventing GEM from being destroyed by an electric arc. 

Features 7 or 12 series connected, individually adjustable high voltage outputs 0 - 1,5kV for each channel (up to 10kV total voltage) individually programmable slope for each channel positive or negative polarity of HVU (depends on the version) fixed +/-5V up to 12A outputs (available depending on version) local or remote control mode two interfaces (USB, RS232) suitable for control using LabView etc. dedicated PC application available