Hamburg 2016 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 50: Neutrinomasse II
T 50.9: Vortrag
Dienstag, 1. März 2016, 18:45–19:00, VMP5 SR 0079
Requirements on read-out electronics for future keV-scale sterile neutrino search with KATRIN — •Kai Dolde — Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
Recent publications show the great potential of the KATRIN (KArlsruhe TRItium Neutrino) experiment in the search for sterile neutrinos in the mass range of a few keV down to active-to-sterile mixing angles at least one order of magnitude smaller than current laboratory limits of sin2θ < 10−3 . In order to be sensitive to the tiny kink-like signature of sterile neutrinos in tritium beta decay, KATRIN requires a novel sophisticated detector and read-out system. Several silicon prototype detectors are under construction at the moment to explore the most suitable detector design for this purpose. The selection of appropriate read-out electronics is strongly triggered by the requirements of allowing only very small systematic uncertainties due to ADC Non-Linearities to reach the expected sensitivity.
This talk investigates the impact of ADC Non-Linearities on the tritium beta decay spectrum, depending on the digitization method of analogue signals of a multi-pixel silicon detector, peak sensing or waveform digitization. The simulations show a higher achievable sensitivity using waveform digitizers and moreover strongly favor additional variable post-acceleration of the electrons to smear out the periodic structure of the ADC Non-Linearities.
This work has been supported by the German BMBF (05A14VK2) and by the Ministry of Science, Research and the Arts, Baden-Wuerttemberg (MWK).