# IDM2016

17-22 July 2016
Master Cutlers Hall
Europe/London timezone

## Charge migration study of a massive cryogenic Ge detector for the detection of light dark matter using the Neganov-Luke Effect

18 Jul 2016, 15:00
20m
Venue: Cutlers' Main Hall (First Floor); Chair: Chamkaur Ghag; Session Manager: Andrew Scarff ()

### Speaker

Mrs. Nadine Foerster (Karlsruhe Institute of Technology)

### Description

The EDELWEISS-III collaboration aims to increase the sensitivity for light dark matter ($\sim 1-10\, \mathrm{GeV/c^2}$) by lowering the energy threshold of its detectors. One technique is to operate the massive high purity cryogenic Germanium detectors at high electric fields (up to $50\, \mathrm{V/cm}$). Particle interactions create electron and hole pairs, which drift to the electrodes and produce phonons on their way. This leads to an amplification of the heat signal, proportional to the applied voltage (Neganov-Luke effect). As charge trapping effects in the bulk and the surface can appreciably degrade the signals, it is important to have a good understanding of the charge migration processes in the Germanium crystals and to find an optimal voltage configuration for the detectors. This contribution presents the results of a detailed study of the detector performance in the high electric field case, including measurements with an EDELWEISS-type detector at ground level. Various voltage configurations were analysed and the experimental data were compared to the results of a hot carrier transport simulation.

### Primary author

Mrs. Nadine Foerster (Karlsruhe Institute of Technology)

### Presentation Materials

 Slides
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