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Universität Tübingen

1. Bähr, Alexander. Development of DEPFET sensors with advanced functionality for applications in X-ray astronomy .

Degree: 2018, Universität Tübingen

Athena is ESA’s next generation observatory for X-ray astronomy. One of its two focal-plane instruments is the WFI, a large area, pixelated silicon-detector for imaging spectroscopy that will provide an unmatched field of view and the capability to observe even brightest radiation sources with high throughput. The WFI’s sensor will be based on the combined sensor-amplifier structure DEPFET. This concept provides a high flexibility in terms of device readout and permits to add various functional features into each pixel of the detector. It is for instance, possible to implement a pixel wise electronic shutter and furthermore, provide every pixel with an additional storage area. In this thesis, these DEPFET concepts with enhanced functionality are evaluated with respect to a potential use as building block for Athena’s WFI. The focus was thereby on the application of a DEPFET based sensors as high count rate spectrometer and the influence and mitigation of readout artifacts on the spectral response of the sensor. To improve the understanding of the different concepts, a series of device simulations was carried out. Parts of these simulations were used as input for the layout of novel devices. To study the properties of the different DEPFET devices, a flexible measurement setup was designed, assembled and operated. With that setup, the properties of different DEPFETs were investigated. Especially time dependent readout artifacts were studied and models to describe these were developed. In the course of this thesis it was furthermore possible to confirm the basic functionality of the first devices providing an additional storage area. Based on the device simulations as well as measurements, spectral simulations were conducted. These show that a DEPFET is capable to do spectroscopy even at fastest timings. However, the spectral performance will deteriorate drastically due to readout artifacts. While the pixel-wise built-in shutter provides good spectral response it severely limits the throughput at fast timings due to the required deadtime. An additional storage area provides both, good spectral performance and high throughput even at fastest timings.; Athena ist das nächste große Observatorium für Röntgenastronomie der ESA. Eines der zwei Instrumente in Athenas Fokalebene ist der WFI, ein großflächiger, pixelierter Silizium Sensor für ortsaufgelöste Röntgenspektroskopie, der gleichzeitig ein bisher nicht erreichtes Gesichtsfeld und höchste Zählratenfähigkeit bietet. Der Sensor des WFI basiert auf der kombinierten Sensor-Verstärker Struktur DEPFET. Neben der hohen Flexibilität bezüglich der Auslese, ist es möglich verschiedenste zusätzliche Eigenschaften in jeden Pixel eines größeren Sensors zu Implementieren. So ist es zum Beispiel möglich jeden Pixel mit einer elektronischen Blende zu versehen. Diese kann außerdem um einen Speicherbereich für Elektronen erweitert werden. In dieser Arbeit wurden diese verbesserten DEPFET Konzepte in Hinblick auf einen Einsatz für den WFI untersucht. Der Fokus wurde dabei auf die… Advisors/Committee Members: Santangelo, Andrea (Prof. Dr.) (advisor).

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APA (6th Edition):

Bähr, A. (2018). Development of DEPFET sensors with advanced functionality for applications in X-ray astronomy . (Thesis). Universität Tübingen. Retrieved from http://hdl.handle.net/10900/84631

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Bähr, Alexander. “Development of DEPFET sensors with advanced functionality for applications in X-ray astronomy .” 2018. Thesis, Universität Tübingen. Accessed November 20, 2018. http://hdl.handle.net/10900/84631.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Bähr, Alexander. “Development of DEPFET sensors with advanced functionality for applications in X-ray astronomy .” 2018. Web. 20 Nov 2018.

Vancouver:

Bähr A. Development of DEPFET sensors with advanced functionality for applications in X-ray astronomy . [Internet] [Thesis]. Universität Tübingen; 2018. [cited 2018 Nov 20]. Available from: http://hdl.handle.net/10900/84631.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bähr A. Development of DEPFET sensors with advanced functionality for applications in X-ray astronomy . [Thesis]. Universität Tübingen; 2018. Available from: http://hdl.handle.net/10900/84631

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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