Berlin 2018 – wissenschaftliches Programm

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VA: Fachverband Vakuumphysik und Vakuumtechnik

VA 3: Large Vacuum Systems

VA 3.3: Vortrag

Montag, 12. März 2018, 15:15–15:45, A 060

The first gaseous ^83mKr in the KATRIN experiment: hardware and simulation — •Fabian Friedel and KATRIN collaboration — Karlsruhe Institute of Technology (KIT), ETP, Postfach 3640, 76021 Karlsruhe

The aim of the Karlsruhe Tritium Neutrino (KATRIN) experiment is to determine the effective mass of the electron antineutrino with a sensitivity of 200  meV/c² (90% C.L.). This will be achieved by measuring the β-spectrum of tritium close to the kinematic endpoint at 18.6 keV. In the neutrino mass measurement the tritium will be injected into the Windowless Gaseous Tritium Source (WGTS). The β-electrons are guided magnetically through the 70 m long set-up and analyzed by an electrostatic filter and a silicium pixel detector. In July 2017 a commissioning milestone of the experiment has been achieved by measuring electrons from a gaseous ^83mKr source transmitted through the whole KATRIN set-up. The radioactive ^83mKr emitts monoenergetic conversion electrons at several energies between 17.8 keV and 32.1 keV. The Kr source was installed at the WGTS. It consisted of a zeolithe substrate where the parent radionuclide ^83mRb had been implanted. The main results of the operation of this krypton source will be presented. Furthermore TPMC simulations of the gas distribution inside the vacuum tube have been performed. This work has been supported by BMBF (05A17VK2), KSETA and the Helmholtz Association.