Promotionsvortrag Physik: Spectrometry, Eye Lens Dosimetry Studies, and Electron Beam Monitoring with the Dosepix Detector

Ankündigung des Promotionsvortrags von: Herrn Florian Beißer

The performance of the hybrid, pixelated Dosepix detector is tested for various applications. The detector consists of 16 x 16 pixels with a pitch of 220 µm and is attached to a 300 µm thick silicon sensor.

The performance of a Dosepix-based spectrometer for mixed photon and electron fields is investigated via Monte-Carlo simulations. However, simulated setup fails to match the performance of comparable devices.

Studies of an active eye lens dosemeter prototype based on Dosepix yield promising results in terms of temperature dependence and clinical applicability. In addition, the expressiveness of the results of the prototype in terms of meaningfully estimating the dose of the eye lens is investigated with and without radiation protection glasses.

Finally, Dosepix detectors are used in combination with UV-cameras to monitor FLASH-capable electron beams at the ARES electron accelerator. While the Dosepix detectors could estimate the position of the beam with an accuracy of ≤0.7mm, the width determination is influenced by large systematic uncertainties up to 60%. Nevertheless, the introduced reconstruction still requires validation on independent data. A UV-sensitive camera is intended to image the emission of nitrogen fluorescence light along the beam as it traverses the air. The proof of concept for this method could be shown for the FXE beamline at the European XFEL, but not for the originally intended ARES beam.

(Vortrag auf Englisch)

Dem Vortrag schließt sich eine Diskussion von 15 Minuten an. Vortrag und Diskussion sind öffentlich. Diesen Verfahrensteilen folgt ein nicht öffentliches Rigorosum von 45 Minuten.