Abstract
The KA rlsruhe TRI tium N eutrino (KATRIN) experiment is a next-generation direct neutrino mass experiment designed to investigate in a model-independent way the fundamental mass scale of neutrinos with sub-eV sensitivity. It combines an ultra-luminous molecular windowless gaseous tritium source with a high resolution electrostatic retarding spectrometer (MAC-E filter system) to measure the spectral shape of β-decay electrons close to the T2 end point at 18.6 keV with unprecedented precision. If no neutrino mass signal is found, the KATRIN sensitivity after 3 years of measurements is m ν 0.2 eV (90%CL.); a ν-mass signal of m ν = 0.35 ( 0.30 ) eV can be measured with 5 (3) σ evidence. The experiment is scheduled to start first tritium runs in late 2008.
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