Berlin 2012 – scientific programme
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VA: Fachverband Vakuumphysik und Vakuumtechnik
VA 4: KATRIN Vacuum Systems
VA 4.2: Talk
Monday, March 26, 2012, 15:40–16:00, HFT-FT 131
The Tritium gas-flow reduction factor of the Differential Pumping Section (DPS2-F) in the vacuum system of KATRIN — •Andreas Kosmider1 and Strahinja Lukic2 — 1KIT - Karlsruher Institut für Technologie, Institut für Kernphysik, Postfach 3640, 76021 Karlsruhe, Germany — 2Laboratory for Physics - 010, Vinca Institute of Nuclear Sciences, M. Petrovica Alasa 12-14, 11001 Belgrade, Serbia
KATRIN, the world’s largest experiment for the direct measurement of the mass of the electron-neutrino, is currently being setup at KIT. Our goal is the determination of the neutrino-mass with a sensitivity of 0.2 eV. KATRIN will deploy a seminal vacuum system that will allow a reduction of the Tritium source gas-flow by a factor of 1022 over a path length of ≈ 70 m. The DPS2-F is a crucial module in this vacuum system featuring a 6 m long fourfold buckled beamline at liquid Nitrogen temperature and four Leybold MAG W 2800 TMP.
Design-values for the DPS2-F called for an reduction factor for Tritium in the order of 105. Simulations using the Molflow+ code delivered an expected value of the actually build system of 1.6 · 104 for Deuterium. The experiments carried out to verify these numbers are the main subject of this talk. They were carried out using the non-radioactive gases D, He, Ne, Ar & Kr injected at flow-rates between 1.8 · 10−3 and 2.8 · 10−2 mbar l/s. The output was measured using a finely calibrated residual gas analyzer. The simulations were confirmed and the gas-flow reduction factor for Tritium was estimated to be 2.5 · 104.