Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 55: Neutrinophysik VII

T 55.5: Talk

Wednesday, March 21, 2018, 17:30–17:45, Z6 - HS 0.001

Pixel-resolved transmission and alignment analysis in KATRIN using ^83mKrypton — •Wonqook Choi for the KATRIN collaboration — Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen

The goal of the KArlsruhe TRItium Neutrino (KATRIN) experiment is the determination of the electron neutrino mass with a sensitivity of m_ν= 0.2 eV/c² (90% C.L.) by measuring an integrated energy spectrum of electrons from tritium β-decay. The experiment uses a MAC-E filter where electrons that have sufficient kinetic energy pass an electrostatic barrier and arrive at the focal plane detector (FPD) where they are counted. An essential characteristic of the experiment concerns the transmission properties of the spectrometer, which are affected by inhomogeneities in the electrostatic and magnetic fields. These can be modeled by simulations which require precise knowledge of the FPD and beamline alignment. A major milestone during the preparation of KATRIN for tritium measurements was the krypton data-taking campaign in summer 2017. During this period we investigated electrons from gaseous and condensed ^83mKr sources. Since ^83mKr features several sharp conversion lines, it is ideally suited for comissioning measurements. The talk reports analysis results of ^83mKr conversion electron measurements and demonstrates the investigation of transmission and alignment properties of the KATRIN beamline. This project is supported by BMBF (05A17VK2), the Helmholtz Young Investigators Group (YIG) VH-NG-1055 and the Helmholtz Association.