Berlin 2018 – wissenschaftliches Programm
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VA: Fachverband Vakuumphysik und Vakuumtechnik
VA 3: Large Vacuum Systems
VA 3.1: Hauptvortrag
Montag, 12. März 2018, 14:00–14:45, A 060
Measurement and simulation of deuterium and tritium retention in the KATRIN beam line — •Carsten Röttele and KATRIN Collaboration — Karlsruhe Institute of Technology (KIT), ETP, Postfach 3640, 76021 Karlsruhe
The Karlsruhe Tritium Neutrino (KATRIN) experiment aims to determine the effective neutrino mass with a sensitivity of mν= 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 magnetically guided through the beamlines of the transport and pumping section to the huge main spectrometer for energy measurement. 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 results of first deuterium (D2) measurements probing the performance of the transport and pumping section, including first commissioning data for the 3-K-cold argon frost layer used to increase the cryo-sorption in the CPS. These results are compared with Test Particle Monte Carlo (TPMC) vacuum simulations with MOLFLOW+. The post-processing of the CPS TPMC results introduces a time dependent model of the reduction factor and of D2 and T2 migration along the beamline. This work was supported by GRK1694, BMBF (05A17VK2), KSETA and the HGF.