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This research group is working on the development of silicon detectors, mainly for tracking and vertex detectors in particle physics.
The groups involvement in the past included the Delphi Micro Vertex Detector (LEP accelerator) and later the CMS Tracker. After the production of the sensors for the Belle II Silicon Vertex Detector (SVD), where the group contributed to its design and quality assurance during production, we are focussing our R&D now to the development of prototypes for the Phase-II upgrades of both the CMS Tracker and the Highly Granularity Calorimeter (HGC). Both subdetectors of the CMS experiment are scheduled for a full replacement during the so-called "long shutdown 3" and a startup later on (~2025).
Beside this, the group is working (on a lower level) at proton-CT for MedAustron cancer hadron therapy and is involved in RD50 and AIDA-2020.
Our research topics are in the context of semiconductor detectors. One focus is on radiation hardness studies where the limits of the NIEL hypothesis is investigated. A further aspect is the development of new analytical methods, e.g. the use of Spreading Resistance Profiling (SRP) in self-built probe stations. This allows to obtain detailed information on the doping profiles and cross-section of the detectors. This information is used in turn to improve the precision of TCAD simulations.
The Know-How of the department covers the design, the electrical and microscopic characterization of silicon sensors, the construction and wire bonding of detector modules and the test of such detector modules using in-house lab tests. For this purpose we operate two clean rooms (ISO 6-7 cleanroom class), which are equipped with several probe stations for sensor tests, a fully automated wire bonder (Delvotec G5) and a 3D coordinate measurement and assembly robot system (Mitutoyo).
Contact: Thomas Bergauer
Since the active areas (and thus the number of needed sensors) of the current and future silicon tracking devices become increasingly larger, the production process of the detectors must be commercialized. We are working since several years on this topic and are collaborating very closely with the semiconductor foundry Infineon for this purpose.
The following video (in German) presents this activities.