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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...
Published in: | Journal of Molecular Structure |
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ISSN: | 0022-2860 |
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2013
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URI: | https://cronfa.swan.ac.uk/Record/cronfa14494 |
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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 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 COLLEGE CODE 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 |
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7f645d598f0afb573309bc5f86ea46fa 8a92e003a0ce92f67bba506d7f03344f |
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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 |
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Journal of Molecular Structure |
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0022-2860 |
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10.1016/j.molstruc.2012.11.022 |
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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 |
2013-07-24T03:27:06Z |
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1822461606544539648 |
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11.048604 |