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Accurate calibration of the laser Raman system for the Karlsruhe Tritium Neutrino Experiment

Magnus Schlösser, Simone Rupp, Hendrik Seitz, Sebastian Fischer, Beate Bornschein, Tim M James, Helmut Telle, Timothy James

Journal of Molecular Structure

Swansea University Authors: Helmut Telle, Timothy James

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DOI (Published version): 10.1016/j.molstruc.2012.11.022

Abstract

The Karlsruhe Tritium Neutrino (KATRIN) experiment aims to measure the neutrino mass via high-precision electron spectroscopy of the tritium beta-decay with a sensitivity of m<sub>nu</sub> = 200meV/c<super>2</super> (90%C.L.). This can only be achieved if systematic uncertain...

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Published in: Journal of Molecular Structure
ISSN: 0022-2860
Published: 2013
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URI: https://cronfa.swan.ac.uk/Record/cronfa14494
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spelling 2019-07-16T15:57:56.1453400 v2 14494 2013-03-27 Accurate calibration of the laser Raman system for the Karlsruhe Tritium Neutrino Experiment 7f645d598f0afb573309bc5f86ea46fa Helmut Telle Helmut Telle true false 8a92e003a0ce92f67bba506d7f03344f Timothy James Timothy James true false 2013-03-27 FGSEN The Karlsruhe Tritium Neutrino (KATRIN) experiment aims to measure the neutrino mass via high-precision electron spectroscopy of the tritium beta-decay with a sensitivity of m<sub>nu</sub> = 200meV/c<super>2</super> (90%C.L.). This can only be achieved if systematic uncertainties are minimized. An important parameter is the isotopic composition of the tritium gas used as the gaseous beta-electron source, which is measured inline by Raman spectroscopy. The KATRIN experiment requires a measurement trueness of better than 10% of said composition; to achieve this, accurate calibration of the Raman system for all hydrogen isotopologues (H<sub>2</sub>; HD; D<sub>2</sub>; HT; DT; T<sub>2</sub>) is required. Here we present two independent calibration methods, namely (i) a gas sampling technique, which promises high accuracy, but which is difficult to apply to tritiated species; and (ii) an approach via theoretical Raman signals (theoretical intensities plus spectral sensitivity), which in principle includes all six isotopologues. For the latter method we incorporated ab-initio off-diagonal matrix elements of the polarizability from the literature; these have been verified by depolarization measurements. The system’s spectral sensitivity was determined by a NIST-traceable SRM2242 luminescence standard. Both methods exhibited their individual merits and difficulties, but in cross calibration proved to be successful: a comparison for the non-radioactive isotopologues (H<sub>2</sub>; HD; D<sub>2</sub>) yielded agreement to better than 2% for the relative Raman response function. This is within the estimated (dominant) uncertainty of the theoretical Raman signal approach of about 3%. Therefore, one can be confident that, when using this approach, the trueness requirement of 10% for the KATRIN-relevant species (T<sub>2</sub>; DT; D<sub>2</sub> and HT) will in all likelihood be exceeded. Journal Article Journal of Molecular Structure 0022-2860 24 7 2013 2013-07-24 10.1016/j.molstruc.2012.11.022 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2019-07-16T15:57:56.1453400 2013-03-27T12:41:46.6066322 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Magnus Schlösser 1 Simone Rupp 2 Hendrik Seitz 3 Sebastian Fischer 4 Beate Bornschein 5 Tim M James 6 Helmut Telle 7 Timothy James 8 0014494-16072019155722.pdf 2013dSchloesserMJMolStructurexxxxinpress.pdf 2019-07-16T15:57:22.6430000 Output 612919 application/pdf Accepted Manuscript true 2019-06-16T00:00:00.0000000 true eng
title Accurate calibration of the laser Raman system for the Karlsruhe Tritium Neutrino Experiment
spellingShingle Accurate calibration of the laser Raman system for the Karlsruhe Tritium Neutrino Experiment
Helmut Telle
Timothy James
title_short Accurate calibration of the laser Raman system for the Karlsruhe Tritium Neutrino Experiment
title_full Accurate calibration of the laser Raman system for the Karlsruhe Tritium Neutrino Experiment
title_fullStr Accurate calibration of the laser Raman system for the Karlsruhe Tritium Neutrino Experiment
title_full_unstemmed Accurate calibration of the laser Raman system for the Karlsruhe Tritium Neutrino Experiment
title_sort Accurate calibration of the laser Raman system for the Karlsruhe Tritium Neutrino Experiment
author_id_str_mv 7f645d598f0afb573309bc5f86ea46fa
8a92e003a0ce92f67bba506d7f03344f
author_id_fullname_str_mv 7f645d598f0afb573309bc5f86ea46fa_***_Helmut Telle
8a92e003a0ce92f67bba506d7f03344f_***_Timothy James
author Helmut Telle
Timothy James
author2 Magnus Schlösser
Simone Rupp
Hendrik Seitz
Sebastian Fischer
Beate Bornschein
Tim M James
Helmut Telle
Timothy James
format Journal article
container_title Journal of Molecular Structure
publishDate 2013
institution Swansea University
issn 0022-2860
doi_str_mv 10.1016/j.molstruc.2012.11.022
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 1
active_str 0
description The Karlsruhe Tritium Neutrino (KATRIN) experiment aims to measure the neutrino mass via high-precision electron spectroscopy of the tritium beta-decay with a sensitivity of m<sub>nu</sub> = 200meV/c<super>2</super> (90%C.L.). This can only be achieved if systematic uncertainties are minimized. An important parameter is the isotopic composition of the tritium gas used as the gaseous beta-electron source, which is measured inline by Raman spectroscopy. The KATRIN experiment requires a measurement trueness of better than 10% of said composition; to achieve this, accurate calibration of the Raman system for all hydrogen isotopologues (H<sub>2</sub>; HD; D<sub>2</sub>; HT; DT; T<sub>2</sub>) is required. Here we present two independent calibration methods, namely (i) a gas sampling technique, which promises high accuracy, but which is difficult to apply to tritiated species; and (ii) an approach via theoretical Raman signals (theoretical intensities plus spectral sensitivity), which in principle includes all six isotopologues. For the latter method we incorporated ab-initio off-diagonal matrix elements of the polarizability from the literature; these have been verified by depolarization measurements. The system’s spectral sensitivity was determined by a NIST-traceable SRM2242 luminescence standard. Both methods exhibited their individual merits and difficulties, but in cross calibration proved to be successful: a comparison for the non-radioactive isotopologues (H<sub>2</sub>; HD; D<sub>2</sub>) yielded agreement to better than 2% for the relative Raman response function. This is within the estimated (dominant) uncertainty of the theoretical Raman signal approach of about 3%. Therefore, one can be confident that, when using this approach, the trueness requirement of 10% for the KATRIN-relevant species (T<sub>2</sub>; DT; D<sub>2</sub> and HT) will in all likelihood be exceeded.
published_date 2013-07-24T03:16:35Z
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score 11.0133505

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