Germanium detector test-stands at the Max Planck Institute for Physics and alpha interactions on passivated surfaces

2nd Workshop on Germanium Detectors and Technologies

Gooch, C.^1 ; Garbini, L.^1 ; Abt, I.^1 ; Schulz, O.^1 ; Palermo, M.^1 ; Majorovits, B.^1 ; Liao, H.-Y.^1 ; Liu, X.^1 ; Seitz, H.^1

Max-Planck-Institute for Physics, Föhringer Ring 6, München

80805, Germany^1

关键词: Design and construction;    Large scale experiments;    Low-background experiment;    Max Planck Institute;    Passivated surface;    Prototype detector;    Segmentation scheme;    Surface contaminations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/606/1/012008/pdf
DOI  :  10.1088/1742-6596/606/1/012008

来源: IOP

【 摘 要 】

The GeDetgroup at the Max Planck Institute for Physics in Munich, Germany, operates a number of test stands in order to conduct research on novel germanium detectors. The test stands are of a unique design and construction that provide the ability to probe the properties of new detector types. The GALATEA test stand was especially designed for surface scans, specifically a-induced surface events, a problem faced in low background experiments due to unavoidable surface contamination of detectors. A special 19-fold segmented coaxial prototype detector has already been investigated inside GALATEA with an a-source. A top surface scan provided insight into the physics underneath the passivation layer. Detector segmentation provides a direct path towards background identification and characterisation. With this in mind, a 4-fold segmentation scheme was implemented on a broad-energy point-contact detector and is being investigated inside the groups K1 test stand. A cryogenic test-stand where detectors can be submerged directly in liquid nitrogen or argon is also available. The goal is to establish segmentation as a viable option to reduce background in future large scale experiments.