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| Home > Publications database > Radiation damage studies of monolithic silicon sensors for particle and astro-particle physics applications |
| Dissertation / PhD Thesis | PUBDB-2024-07838 |
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2024
Berlin
Abstract: The development and characterization of new detector technologies is an important research path in order to facilitate future high energy and astroparticle physics experiments. For both the harsh radiation environment of modern collider experiments and the proton, electron and heavy ion rich environment in the outer earth orbit, the radiation hardness of modern detectors is one of their most important figures of merit. This thesis explores the radiation hardness and optimization of detectors for both space-borne astroparticle physics and modern collider experiments. In the first part, the radiation hardness of the ULTRASAT space mission's camera is quantified. ULTRASAT is a wide-angle space telescope that will perform deep time-resolved surveys in the near ultraviolet spectrum. ULTRASAT is led by the Weizmann Institute of Science in Israel and the Israel Space Agency and is planned for launch in 2027. The Complementary Metal Oxide Semiconductor (CMOS) camera was designed and built by DESY. The radiation hardness of the CMOS Imaging Sensors was evaluated in terms of both cumulative damage and single event effects. Furthermore, the measured degradation is used to estimate the impact on the detection limits of the camera.In the second part, the radiation hardness of the depleted monolithic active pixel tracker MALTA is investigated. MALTA is a tracking sensor with a design that targets the ATLAS Inner Tracker outer pixel layer requirements. Several pixel geometries and silicon growing variations have been investigated in order to achieve better tracking performances for the future collider experiments. Both ULTRASAT and MALTA sensors have been designed and manufactured by Tower Semiconductor in the $180$ nm feature size process. This allows for a comparison between the radiation hardness of the two sensors and sets the scene for an overarching discussion of radiation hardness in the context of the two adjacent fields of high energy physics and astroparticle physics and how the lessons learned in each field could be brought together.
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