Determination of space charge distributions in highly segmented large volume HPGe detectors from capacitance-voltage measurements

The space charge distribution of a large volume highly segmented HPGe detector was determined by a non-destructive capacitance-voltage measurement. The capacitances between the 36 segments and the core were measured simultaneously with a precision pulser which was implemented in the core preamplifier. The pulser measurement was compared to and validated by direct capacitance measurements. The three-dimensional doping profile was reconstructed using analytical and numerical methods. Consistent values for the impurity concentration in the range of 0.5 and 1.5x1010 cm-3 were obtained.