Quantitative Long-Term Monitoring of the Circulating Gases in the KATRIN Experiment Using Raman Spectroscopy

0532615 - ÚJF 2021 RIV CH eng J - Journal Article
Aker, M. - Altenmuller, K. - Beglarian, A. - Behrens, J. - Berlev, A. I. - Dragoun, Otokar - Kovalík, Alojz - Lebeda, Ondřej - Ryšavý, Miloš - Schlosser, M. - Šefčík, Michal - Slezák, Martin - Vénos, Drahoslav … Total 129 authors
Quantitative Long-Term Monitoring of the Circulating Gases in the KATRIN Experiment Using Raman Spectroscopy.
Sensors. Roč. 20, č. 17 (2020), č. článku 4827. E-ISSN 1424-8220
R&D Projects: GA MŠMT LM2015056; GA MŠMT LTT19005
Institutional support: RVO:61389005
Keywords : KATRIN * Raman spectroscopy * tritium * gas composition monitoring
OECD category: Particles and field physics
Impact factor: 3.576, year: 2020
Method of publishing: Open access
https://doi.org/10.3390/s20174827

The Karlsruhe Tritium Neutrino (KATRIN) experiment aims at measuring the effective electron neutrino mass with a sensitivity of 0.2 eV/c(2), i.e., improving on previous measurements by an order of magnitude. Neutrino mass data taking with KATRIN commenced in early 2019, and after only a few weeks of data recording, analysis of these data showed the success of KATRIN, improving on the known neutrino mass limit by a factor of about two. This success very much could be ascribed to the fact that most of the system components met, or even surpassed, the required specifications during long-term operation. Here, we report on the performance of the laser Raman (LARA) monitoring system which provides continuous high-precision information on the gas composition injected into the experiment's windowless gaseous tritium source (WGTS), specifically on its isotopic purity of tritium-one of the key parameters required in the derivation of the electron neutrino mass. The concentrationsc(x)for all six hydrogen isotopologues were monitored simultaneously, with a measurement precision for individual components of the order 10(-3)or better throughout the complete KATRIN data taking campaigns to date. From these, the tritium purity,epsilon(T), is derived with precision of <10(-3)and trueness of <3 x 10(-3), being within and surpassing the actual requirements for KATRIN, respectively.
Permanent Link: http://hdl.handle.net/11104/0311051