Berlin 2018 – wissenschaftliches Programm

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VA: Fachverband Vakuumphysik und Vakuumtechnik

VA 3: Large Vacuum Systems

VA 3.2: Vortrag

Montag, 12. März 2018, 14:45–15:15, A 060

Loops - The tritium processing system of the KATRIN experiment — •Alexander Marsteller — Karlsruher Institut für Technologie, Karlsruhe, Deutschland

The Karlsruhe Tritium Neutrino (KATRIN) experiment aims to determine the effective neutrino mass with a sensitivity of m_ν= 0.2 eV/c² (90% C.L.) using electrons from the tritium β-decay. The β-electrons produced in the windowless gaseous tritium source (WGTS) are guided by magnetic fields ranging from 3.0 T to 5.6 T through the beamlines of the transport and pumping section to the huge main spectrometer for energy measurement. To reduce systematic uncertainty on the neutrino mass, the tritium density inside the WGTS needs to be stable to the promille level. In order to minimize the background rate from tritium (T₂) decaying in the spectrometer to less than 0.01 counts per second, the pumping sections have to reduce the tritium flow from the WGTS by at least 14 orders of magnitude. Therefore KATRIN combines a differential pumping section (DPS), using turbo-molecular pumps and a cryogenic pumping section (CPS) with a combined reduction factor of more than 10¹⁴.

This talk introduces the Loops system responsible for cycling tritium throughout the source section (WGTS and DPS) of the KATRIN experiment. Furthermore the magnetic shielding of the TMPs used in the Loops system of WGTS and DPS is introduced. This work was supported by BMBF (05A17VK2), KSETA and the HGF.