Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 13: Semiconductor Detectors:Radiation Hardness, new Materials and Concepts
T 13.9: Vortrag
Montag, 21. März 2022, 18:15–18:30, T-H26
Upgraded Proton Irradiation Site at Bonn University — •Pascal Wolf1, Dennis Sauerland2, Jochen Dingfelder1, David-Leon Pohl1, and Norbert Wermes1 — 1Physikalisches Institut, Universität Bonn — 2Helmholtz Institut für Strahlen- und Kernphysik, Universität Bonn
The Bonn Isochronous cyclotron delivers 14 MeV (≈ 12.5 MeV on-device) protons with typical beam currents of 1 µA and beam diameters of a few millimeters to the irradiation site. Enhanced beam diagnostics as well as R/O electronics allow for online monitoring across several orders of magnitude of beam currents with a relative uncertainty of ≈ 1%. Devices are irradiated by being scanned through the beam in a row-wise pattern while housed in a thermally-insulated cooling box kept at ≈ -20 ∘C to minimize annealing. Online monitoring of the beam current at extraction facilitates a measurement of the fluence per scanned row with an accuracy of a few %, ensuring homogeneous irradiation. The setup allows one to power and read out DUTs during irradiation as well as pause irradiations for in-between measurements. Latest irradiations of thin CMOS pixel test structures yield a proton hardness factor with reduced uncertainty, compatible with previous measurements and simulation, facilitating irradiations up to 1016 neq / cm2 within a few hours. The setup, its reworked components, the irradiation procedure as well as the latest proton hardness factor measurements are presented in this talk.