Dresden 2017 – wissenschaftliches Programm
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VA: Fachverband Vakuumphysik und Vakuumtechnik
VA 2: Large Vacuum Systems
VA 2.1: Hauptvortrag
Montag, 20. März 2017, 11:00–11:45, HSZ 301
Commissioning of the complete KATRIN Vacuum System — •Joachim Wolf and KATRIN Collaboration — Karlsruhe Institute of Technology (KIT), IEKP, Postfach 3640, 76021 Karlsruhe
The Karlsruhe Tritium Neutrino (KATRIN) experiment uses the kinematics of electrons from the tritium β-decay to determine the effective neutrino mass with a sensitivity of mν= 200 meV/c2 (90% C.L.). The β-electrons are produced in the windowless gaseous tritium source (WGTS) at a pressure of 10−3 mbar. Superconducting magnets around the beam lines guide them through the transport and pumping section to the spectrometer, where their energy is analysed. Tritium decaying inside the spectrometer would increase the background rate. Therefore the pumping sections have to reduce the tritium flow from the WGTS by at least 14 orders of magnitude. Two techniques are employed for the tritium retention. The differential pumping section (DPS) uses cascaded turbo-molecular pumps and in the cryogenic pumping section (CPS) the tritium gas is cryosorbed on a 3-K-cold layer of argon frost that covers the beam tubes. The spectrometer section consists of the Pre-Spectrometer (8.5 m3, 10−11 mbar), the huge Main Spectrometer (1240 m3, 10−11 mbar), and the detector section, where electrons that pass the electrostatic filter of the Main Spectrometer are counted. The setup of the KATRIN experiment has been completed at KIT in 2016. This talk introduces the various parts of the experiment and their challenging vacuum requirements. Performance data from the ongoing commissioning phase are presented. We acknowledge the support by KSETA, BMBF (05A14VK2), HAP and the Helmholtz association.