Würzburg 2018 – scientific programme
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T: Fachverband Teilchenphysik
T 55: Neutrinophysik VII
T 55.1: Talk
Wednesday, March 21, 2018, 16:30–16:45, Z6 - HS 0.001
Investigating the transmission function of KATRIN using gaseous 83mKrypton — •Lutz Schimpf for the KATRIN collaboration — Karlsruhe Institute of Technology (KIT), ETP, Postfach 3640, 76021 Karlsruhe
The Karlsruhe Tritium Neutrino experiment (KATRIN) aims to measure m(νe) with a sensitivity of 200 meV at 90 % confidence level. To determine the neutrino mass an integrated spectrum of the electron energy close to the endpoint is measured and a fit to the data containing the neutrino mass as a free parameter is performed. The measured beta spectrum is affected by various systematics, with the transmission function properties of the MAC-E filter spectrometer playing a major role. Although the transmission function of a MAC-E filter can be analytically calculated its shape is broadened and distorted by two main systematics. One is the short-term high voltage stability of the retardation potential in the main spectrometer, which is in the millivolts range. The other main systematic is the emission of synchrotron radiation while the electrons are magnetically guided from their origin in the tritium source towards the spectrometer and detector section. The usage of 83mKrypton as source gas allows to study the above described transmission function properties, since the discrete energy spectrum of krypton provides monoenergetic electrons with line widths in the range of 1 eV and below. Both the influences on the transmission function as well as its influence on the measured linewidth of the krypton spectrum will be presented. This work has been supported by BMBF (05A17VK2), KSETA and the Helmholtz Association (VH-NG-1055).