Mainz 2022 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 11: Beam Dynamics 2
AKBP 11.6: Vortrag
Mittwoch, 30. März 2022, 17:15–17:30, AKBP-H13
Proton Irradiation Site for Si-Detectors at the Bonn Isochronous Cyclotron — •Dennis Sauerland1, Paul-Dieter Eversheim1, Reinhard Beck1, Pascal Wolf2, and Jochen Dingfelder2 — 1Helmholtz-Institut für Strahlen und Kernphysik, Universität Bonn — 2SiLab, Physikalisches Institut, Universität Bonn
With the Bonn Isochronous Cyclotron either protons, deuterons or ions up to 12C4+ are accelerated to a kinetic energy ranging from 7 to 14 MeV per nucleon. The extracted beam is guided to one of five experimental sites.
At a new proton irradiation site, a 1 µA proton beam with a diameter of ≤ 6 mm is utilized to irradiate a target in air, e.g. cooled Si semiconductor detectors for radiation hardness tests. For homogeneous irradiation, the targets are scanned through the beam in a row-wise pattern with constant velocity and a row spacing much smaller than the beam diameter. During the irradiation procedure, the beam current and position is continuously measured non-destructively using a calibrated, secondary electron emission-based beam monitor, positioned at the exit window of the beamline. An on-the-fly beam monitor calibration can be obtained using a movable Faraday Cup. The diagnostics and the irradiation procedure ensure a homogeneous irradiation of the target with a fluence error of ≤ 2 %.
In this talk, an overview of the accelerator facility will be given, the irradiation site with its beam diagnostics will be presented in detail, along with an outlook on planned future developments at the facility.