Aachen 2019 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 2: Halbleiterdetektoren I
T 2.9: Vortrag
Montag, 25. März 2019, 18:00–18:15, H02
Development of a novel proton irradiation site at the HISKP isochronous cyclotron Bonn — •Pascal Wolf1, Dieter Eversheim2, David-Leon Pohl1, Martin Urban2, and Norbert Wermes1 — 1Physikalisches Institut, Universität Bonn — 2Helmholtz Institut für Strahlen- und Kernphysik (HISKP), Universität Bonn
A novel proton irradiation site for silicon detectors is currently being developed at Bonn University. The site is located at the isochronous cyclotron of the Helmholtz Institut für Strahlen- und Kernphysik (HISKP). The cyclotron provides protons with up to 14 MeV kinetic energy with beam currents between a few nA and 1 µA. Light ions, such as deuterons, alphas up to 12C, can also be produced with kinetic energies from 7 to 14 MeV per nucleon. The beam spot at extraction can be adjusted from a few mm to approximately 2 cm in diameter. An electron-cyclotron-resonance (ECR) source with low source-noise enables a stable beam over time. Dedicated secondary-electron monitors with custom readout electronics have been developed for on-line beam-current and position monitoring. The intrinsic resolution of the readout electronics allows to measure the secondary-electron current with a precision of 1%. The goal is to measure the primary beam current with comparable precision in order to reduce the uncertainty on the proton fluence at the device. GEANT4 simulations of energy distributions along the beam line up to the setup conclude a proton hardness factor of κ≈ 3, allowing to irradiate up to 1016n.e.qcm2 in 60 minutes.