Dortmund 2021 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 72: Experimental techniques in astroparticle physics III
T 72.9: Vortrag
Mittwoch, 17. März 2021, 18:00–18:15, Tv
Quantitative Long-Term Monitoring of the Gas Composition in the KATRIN Experiment Using Raman Spectroscopy — •Genrich Zeller — Karlsruhe Institute of Technology
The Karlsruhe Tritium Neutrino (KATRIN) experiment aims at measuring the effective electron neutrino mass with a sensitivity of 0.2 eV/c2 (90% C.L.) by investigating the energy spectrum of tritium beta-electrons near the kinematic endpoint of 18.6 keV. Analysis of the first neutrino mass data from 2019 set the known neutrino mass limit to 1.1 eV. This achievement was made possible, because most of the system components met, or even surpassed, the requirements during long-term operation. One important component is the laser Raman (LARA) system, which provides continuous high-precision information on the composition and tritium purity of the gas in the experiment’s windowless gaseous tritium source (WGTS). In this talk, the performance and achievements of the LARA system are presented. The concentrations cx for all six hydrogen isotopologues were monitored simultaneously, with a measurement precision of the order 10−3 throughout the complete KATRIN data taking. From these, the tritium purity, єT, is derived with precision of <10−3 and trueness of < 3· 10−3, fulfilling and surpassing the requirements for KATRIN. This work is supported by the Helmholtz Association (HGF), the Ministry for Education and Research BMBF (05A17PM3, 05A17PX3, 05A17VK2, and 05A17WO3), the Helmholtz Alliance for Astroparticle Physics (HAP), and the Helmholtz Young Investigator Group (VH-NG-1055).