Development Of Electrical Quality Assurance Procedures And Methods For The Silicon Tracking System Of The Cbm Experiment

Development of Electrical Quality Assurance Procedures and Methods for the Silicon Tracking System of the CBM Experiment

Position-sensitive silicon detectors have been used in particle physics experiments for more than 40 years. Technological advances have made it possible to build large-area silicon trackers with millions of channels. Double-sided silicon microstrip detectors have been selected as the sensor technology for the Silicon Tracking System (STS) of the Compressed Baryonic Matter (CBM) experiment at the Facility for Antiproton and Ion Research (FAIR). The goal of the CBM experiment is to investigate the properties of strongly interacting matter at high baryon density in relativistic heavy ion collisions. The challenge is to perform measurements at interaction rates of up to 10 MHz. This will give access to extremely rare observables such as multi-strange hyperons or hadrons with charm quarks. Up to 700 particles per collision are expected within detector acceptance. Their tracks and thus their momentum are measured in the STS with high resolution. The STS consists of 876 microstrip sensors with a total area of about 4 m^2. Each sensor has 1024 strips per side, resulting in a total of about 1.8e6 channels. To ensure high-precision measurement, the STS must use high-quality microstrip sensors. The fraction of defective strips should not exceed 1.5% per sensor. The sensors must also meet CBM specifications for the electrical parameters. The work presented in this thesis focuses on the quality assurance of microstrip sensors. For this purpose, a highly automated probe station was designed and built at the University of Tubingen. The methods for determining the electrical characteristics of microstrip sensors were developed. This made it possible to investigate the prototype sensors for STS in detail. The results and challenges are discussed in detail. Suggestions are provided that can help improve sensor design. As a result of the conducted quality assurance, the acceptance criteria for CBM microstrip sensors at the series production stage were defined. The developed quality control methods made it possible to reliably identify defective strips. This allows for the selection of high-quality sensors for the construction of the STS and ensures high data quality during the operation of the CBM experiment.

Electrical Power Transmission and Distribution

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