Hamburg 2016 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
T: Fachverband Teilchenphysik
T 69: Neutrinomasse III
T 69.6: Vortrag
Mittwoch, 2. März 2016, 18:05–18:20, VMP5 SR 0079
Krypton mode of the Windowless Gaseous Tritium Source of the KATRIN Experiment — •Moritz Machatschek for the KATRIN collaboration — KIT-IEKP, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Deutschland
The KArlsruhe TRItium Neutrino experiment, currently in its final construction & commissioning phase will perform a kinematic measurement of the neutrino mass, by precision spectroscopy of tritium beta decay at the endpoint of 18.6 keV. To reach the planned sensitivity of 200 meV (90 % C. L.) a precise knowledge of the systematic measurement uncertainties of the experiment is crucial.
Several important systematics arise in the 10 m long source containing the gaseous tritium, for instance related to the low density plasma generated by the beta decay. Together with the rear wall closing off the beam tube this defines an inhomogeneous potential, which has to be known to a level of 10 mV. One way to analyze it is gaseous, excited krypton 83mKr. The krypton will be added to the tritium with a low concentration of <10−4, which will not affect the normal tritium gas profile. 83mKr deexcites by internal conversion, exhibiting several lines with mono energetic electrons at 18 keV and around 31 keV. When measured by the KATRIN main spectrometer, the shape and position of these lines will carry information on the plasma potential distribution. In this talk an overview of the simulation and modelling of the krypton mode as well as the experimental implications for KATRIN will be given.
Supported by BMBF (05A14VK2) and by the Helmholtz Association