Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 66: Semiconductor Detectors: Radiation Hardness, new Materials and Concepts 2

T 66.7: Vortrag

Mittwoch, 23. März 2022, 17:45–18:00, T-H25

Time resolution comparison between LGADs and 3D silicon detectors — •Montague King, Christina Schwemmbauer, Leena Diehl, Dennis Sperlich, Marc Hauser, and Ulrich Parzefall — Albert-Ludwigs Universität, Freiburg, Germany

For the planned high luminosity upgrade of the LHC it is vital to develop detector systems with both excellent spatial and timing resolution in the inner tracking layers to be able to distinguish separate collisions in the same bunch crossing. This has to be achieved even after severe irradiation with expected fluences of up to 2.6 x 10¹⁶ n_eq/cm².

It has been shown that a timing resolution of 30 ps can be achieved with Low Gain Avalanche Diodes (LGADs). However, these devices have drawbacks, especially regarding spatial resolution, effective fill factor and radiation hardness. A second detector type, 3D-detectors with electrodes extending deeply into the silicon bulk, are expected to be able to achieve such a high timing resolution while having a superior spatial resolution and radiation hardness.

In this talk, the calibration of a setup developed specifically for fast timing measurements at the University of Freiburg will be presented. This setup utilises a ⁹⁰Sr electron source along with a reference sensor and scintillator to measure fluctuations in the time between signals from reference and tested sensor. Furthermore, first results measured for LGADs before and after irradiation as well as unirradiated 3D sensors will be discussed.