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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 7: Applied Physics with Accelerators

AKBP 7.4: Talk

Wednesday, March 20, 2024, 10:15–10:30, E 020

Installation of the Future Neutron Irradiation Site at the Bonn Isochronous Cyclotron — •Maximilian Loepke, Reinhard Beck, Dieter Eversheim, and Dennis Sauerland — Helmholtz-Institut für Strahlen- und Kernphysik Bonn

The Bonn Isochronous Cyclotron provides a beam of protons, deuterons, α-particles with a kinetic energy ranging from 7 to 14 MeV per nucleon. Since 2019, a proton beam is utilized for irradiation of e.g. silicon pixel detectors for radiation hardness studies.

It is planned to extend the facility’s irradiation and experimentation capabilities by providing a neutron beam in the near future. The neutrons are produced by splitting-up deuterons into protons and neutrons in a thick carbon converter. Protons are stopped in the converter whereas the neutrons’ flux and angular energy distribution is optimized by a subsequent copper/tungsten collimator. After collimation, the neutron beam can be utilized for irradiation.

For the installation of the site, a CAD model of the experimental area was photogrammetrically created using the tools Meshroom and Meshlab. The collimator will be precisely aligned onto the beam axis. Beam axis determination and collimator alignment will be facilitated using a laser tracker. The beam diagnostics at the site will consist of a Secondary Electron Monitor (SEM) for non-destructive monitoring of beam current and position, a Faraday-Cup for SEM calibration and a scintillation screen for visual adjustment of the beam profile and the optics of the transfer beamline. This talk gives a detailed overview on the next steps of the installation of this irradiation site.

Keywords: Bonn; Isochronous Cyclotron; SEM; Experimental Area; Neutron Beam