Quantitative Long-Term Monitoring of the Circulating Gases in the KATRIN Experiment Using Raman Spectroscopy
Creators: name: Aker, Max
name: Altenmüller, Konrad
name: Beglarian, Armen
name: Behrens, Jan
name: Berlev, Anatoly
name: Besserer, Uwe
name: Bieringer, Benedikt
name: Blaum, Klaus
name: Block, Fabian
name: Bornschein, Beate
name: Bornschein, Lutz
name: Böttcher, Matthias
name: Brunst, Tim
name: Caldwell, Thomas C.
name: Chilingaryan, Suren
name: Choi, Wonqook
name: Díaz Barrero, Deseada D.
name: Debowski, Karol
name: Deffert, Marco
name: Descher, Martin
name: Doe, Peter J.
name: Dragoun, Otokar
name: Drexlin, Guido
name: Dyba, Stephan
name: Edzards, Frank
name: Eitel, Klaus
name: Ellinger, Enrico
name: Engel, Ralph
name: Enomoto, Sanshiro
name: Fedkevych, Mariia
name: Felden, Arne
name: Formaggio, Joseph F.
name: Fränkle, Florian
name: Franklin, Gregg B.
name: Friedel, Fabian
name: Fulst, Alexander
name: Gauda, Kevin
name: Gil, Woosik
name: Glück, Ferenc
name: Größle, Robin
name: Gumbsheimer, Rainer
name: Hannen, Volker
name: Haußmann, Norman
name: Helbing, Klaus
name: Hickford, Stephanie
name: Hiller, Roman
name: Hillesheimer, David
name: Hinz, Dominic
name: Höhn, Thomas
name: Houdy, Thibaut
name: Huber, Anton
name: Jansen, Alexander
name: Karl, Christian
name: Kellerer, Jonas
name: Kippenbrock, Luke
name: Klein, Manuel
name: Köhler, Christoph
name: Köllenberger, Leonard
name: Kopmann, Andreas
name: Korzeczek, Marc
name: Kovalík, Alojz
name: Krasch, Bennet
name: Krause, Holger
name: La Cascio, Luisa
name: Lasserre, Thierry
name: Le, Thanh-Long
name: Lebeda, Ondřej
name: Lehnert, Bjoern
name: Lokhov, Alexey
name: Machatschek, Moritz
name: Malcherek, Emma
name: Marsteller, Alexander
name: Martin, Eric L.
name: Meier, Matthias
name: Melzer, Christin
name: Mertens, Susanne
name: Müller, Klaus
name: Niemes, Simon
name: Oelpmann, Patrick
name: Osipowicz, Alexander
name: Parno, Diana S.
name: Poon, Alan W.P.
name: Lopez Poyato, Jose M.
name: Priester, Florian
name: Rest, Oliver
name: Röllig, Marco
name: Röttele, Carsten
name: Robertson, R.G. Hamish
name: Rodenbeck, Caroline
name: Ryšavỳ, Milos
name: Sack, Rudolf
name: Saenz, Alejandro
name: Schäfer, Peter
name: Schaller (Née Pollithy), Anna
name: Schimpf, Lutz
name: Schlösser, Klaus
name: Schlösser, Magnus
name: Schlüter, Lisa
name: Schrank, Michael
name: Schulz, Bruno
Publisher: name: Humboldt-Universität zu Berlin
Year: 2020
Subjects: subject: Raman spectroscopy
subject: tritium
subject: gas composition monitoring
subject: KATRIN
subject: 530 Physik

description: The Karlsruhe Tritium Neutrino (KATRIN) experiment aims at measuring the effective electron neutrino mass with a sensitivity of 0.2 eV/c2, 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 concentrations cx 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, εT, is derived with precision of &lt;10−3 and trueness of &lt;3 × 10−3, being within and surpassing the actual requirements for KATRIN, respectively.