Heidelberg 2022 – wissenschaftliches Programm
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ST: Fachverband Strahlen- und Medizinphysik
ST 9: Detectors and Applications II
ST 9.4: Vortrag
Donnerstag, 24. März 2022, 14:45–15:00, ST-H4
Studies towards a Time-of-Flight system equipped with LGADs — •Valerie Hohm1, Kevin Kröninger1, Sebastian Pape1,2, and Jens Weingarten1 — 1TU Dortmund, Department of Physics — 2CERN
Treatment planning is a crucial part in particle therapy of cancer in order to prevent healthy tissue from being irradiated falsely. One approach to improve the precision in proton therapy is the usage of proton computed tomography (pCT) for imaging. In such a system the paths of the protons as well as their energy loss in a phantom are measured to create an image of the phantom.
To measure the energy loss of protons, a Time-of-Flight (ToF) system can be used. The time an ionising particle needs to traverse two detectors in a given distance depends on its energy. For a precise energy measurement, the time resolution of the used detectors needs to be as small as possible.
In high-energy physics so called Low Gain Avalanche Detectors (LGADs) were developed for the ATLAS and CMS experiment upgrades. These n-in-p silicon sensors with an additional gain layer are designed for a typical charge amplification in the range of 10 to 30 for unirradiated LGADs which results in a time resolution up to 30 ps.
This talk focuses on the usage of LGADs in a ToF system. The feasibility of the system for the energy measurement in a proton tomography system will be presented as well as first measurements with a prototype.