Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Poster

HK 27.54: Poster

Dienstag, 28. März 2017, 16:45–18:45, F Foyer

Construction of a neutron source for silicon detector irradiation — •Eduard Friske — Uni Tübingen, Tübingen, Germany

The silicon strip sensors of the Silicon Tracking System used for the CBM experiment at FAIR are subject to high doses of ionizing and non-ionizing radiation. Simulations predict the total non-ionizing dose to reach ≈10¹⁴ n_eq/cm².

To verify the predicted changes in detector performance due to radiation damage, a tunable neutron source has been constructed. It uses the deuteron beam of a Van-de-Graaf accelerator to produce neutrons using D-D fusion. The gas cell containing the deuterium gas is cooled to cryogenic temperatures with liquid nitrogen to maximize gas density and increase the neutron output while retaining a compact source design.

The goal of the setup is to reach the simulated dose within several weeks. This long irradiation time allows to monitor the degradation and change in electrical properties of the irradiated sensor under realistic conditions. Live monitoring of the sensor is achieved by a collimated beta source creating hits which are read out by a commercial readout system.