Surface projection of HPGe- detectors

Several encapsulated single Germanium detectors have been mounted in one unit and integrated in a cryostat, in order to build efficient spectrometers to detect γ radiation emitted by nuclei excited in nuclear reactions. This kind of crystal encapsulation offer advantages compared to standard set-up of HPGedetectors. The basic aim of the following work is to develop a new capsule technology, in particular concerning the high-vacuum tightness and the temperature influence during the CO2 welding procedure. The difficulty is the complexity of the detector and the germanium crystal respectively which reacts very sensitive to external influences. Consequently there is a risk that the germanium is no longer suitable for a detector because of an incorrectly employed manufacturing process. Another difficulty is the wall thickness and the material of the capsule as well as the complicated geometric shape of the detectors. To be able to understand all the circumstances of this partially complicated production, physical and economic aspects must be taken into account.