Münster 2017 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 81: Neutrinophysik 7 (Doppelbetazerfall, sterile Neutrinos)
T 81.5: Vortrag
Mittwoch, 29. März 2017, 17:55–18:10, VSH 118
Silicon drift detector prototypes for the keV-scale sterile neutrino search with TRISTAN — •Konrad Altenmüller1,2, Tobias Bode3, Olivier Gevin2, Marc Korzeczek4, Thierry Lasserre2,5, Olivier Limousin2, Daniel Maier2, Susanne Mertens3, and Martin Slezak3 — 1Physik Department, Technische Universität München — 2CEA Saclay / IRFU, France — 3Max-Planck-Institut für Physik, München — 4IEKP, Karlsruher Institut für Technologie — 5IAS, Technische Universität München
The TRISTAN project is an upgrade of the KATRIN experiment to search for the signature of keV-scale sterile neutrinos in the electron spectrum of tritium. Since the detector in the KATRIN setup is designed to count electrons within a controlled energy range rather than to do electron spectroscopy, a new detector and read-out system are needed. An array of up to 10 000 silicon drift detectors could meet the requirements of a few hundreds eV energy resolution and ultra-low electronics noise while handling a high electron flux at the same time. Prototypes of 7-pixel arrays with 20-30 nm deadlayer were produced in different designs by MPG Halbleiterlabor. In this talk the results of the characterization with a proven multichannel ASIC (IDeF-X by CEA), originally developed for spaceborne applications, and with an ultra-low noise ASIC by XGLab are presented; the achieved energy resolution, noise performance, and charge sharing characteristics are reported. Also the analysis methods and consequences for the final TRISTAN setup are discussed.