München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 43: Astroparticle Physics III

HK 43.7: Talk

Wednesday, March 20, 2019, 18:15–18:30, HS 16

Characterization of the TRISTAN prototype detectors with electrons — •Daniel Siegmann for the KATRIN collaboration — Max Planck Institut for Physics — Föhringer Ring 6

The KATRIN (Karlsruhe Tritium Neutrino) experiment investigates the energetic endpoint of the tritium beta-decay spectrum to determine the effective mass of the electron anti-neutrino with a sensitivity of 200 meV (90% C.L.) after an effective data taking time of three years starting in March 2019.

After the data taking for the neutrino mass survey is completed the TRISTAN (TRitium Invetigations of STerile to Active Neutrino mixing) project will upgrade the current detector in the KATRIN experiment to search for the signature of a keV sterile neutrino in the entire tritium beta decay spectra. One of the greatest challenges is to handle high signal rates as a result of the strong activity of the KATRIN tritium source. Therefore, a novel 3500 multi-pixel silicon drift detector is being designed which is able to handle rates up to 100 kcps in each pixel while maintaining an excellent energy resolution of 300 eV (FWHM) at 20 keV.

To fulfill these requirements in the future multiple smaller 7 channel prototypes were designed and characterized. The investigation of various detector entrance window technologies and their effect on the detector response for electrons are discussed in this talk.

This work is supported by the Max Planck society and the TU Munich (``Chair for Dark Matter, Susanne Mertens'').