Speaker
Description
The development status of a novel proton irradiation site for silicon detectors is presented. The site is located at the isochronous cyclotron of the HISKP (Helmholtz Institut für Strahlen- und Kernphysik) of the University of Bonn. The cyclotron provides protons with up to 14 MeV kinetic energy with beam currents between a few nA and 1 $\mu$A. Light ions, such as deuterons, $^{3,4}$He or $^{12}$C, 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. Preliminary beam-current calibrations are shown. GEANT4 simulations of energy distributions along the beam line up to the setup conclude a proton hardness factor of $\kappa\approx 3$, allowing to irradiate up to $10^{16}\frac{\text{n.e.q}}{\text{cm}^2}$ in 60 minutes. The intended irradiation parameters such as temperature, scanning and shielding are presented as well as plans for measurements of proton and deuteron hardness factors.
