Gießen 2024 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 61: Instrumentation XIV

HK 61.5: Talk

Thursday, March 14, 2024, 17:00–17:15, HBR 14: HS 1

Effects of heavy ions irradiation on polycrystalline diamond detectors — •Matteo Alfonsi, Chiara Nociforo, Mladen Kiš, Michael Träger, Joshua Galvis Tarquino, Tobias Blatz, Christos Karagiannis, Martin Winkler, and Haik Simon — GSI Helmholtzzentrum für Schwerionenforschung GmbH Planckstraße 1, 64291 Darmstadt, Germany

The Super Fragment Separator at the FAIR accelerator complex will adopt Chemical Vapor Deposition diamond detectors as radiation-hard, high rate counters. They must monitor and optimize the beam transmission for ions rates up to 10⁷ ions/spill, and calibrate the other beam diagnostics devices in duty at higher beam intensities. The target vacuum chamber hosts a 7 × 7 mm² single crystal diamond and a 25 × 25 mm² polycrystalline diamond: they are required to detect crossing particles with high efficiency (> 98%) in case of heavy species (Ar to U), and to survive several years accumulating, due to the target proximity, a dose of few MGy per year. Laboratory measurements and beam test campaigns were arranged in the past years for the validation of the proposed sensors, in particular for the polycrystalline technology. Here we report the outcome of the irradiation of a sensor based on a 20 × 20 mm² polycrystalline diamond produced by Element Six, with high intensity 1 GeV/nucleon Pb and U beams at GSI (Darmstadt). The detector signal shape characteristics and the ion counting efficiency have been monitored by interleaving periods of low ions rates in which we evaluate possible damages or performance degradation, during and after a total bombardment of almost 10¹² heavy ions.

Keywords: Diamond Detectors; Radiation-hard detectors; Beam-line instrumentation