Quantitative long-term monitoring of the circulating gases in the KATRIN experiment using Raman spectroscopy
Name
sensors-20-04827-v2.pdf
Size
6.48 MB
Format
Adobe PDF
Checksum (MD5)
102c09b4c2a70ade290f84942099d01f
Author(s)
Formaggio, Joseph A
Xu, Weiran
Date Issued
August 2020
Journal
Sensors
Publisher
Multidisciplinary Digital Publishing Institute
Citation
Aker, Max et al. "Quantitative long-term monitoring of the circulating gases in the KATRIN experiment using Raman spectroscopy." Sensors 20, 17 (August 2020): 4827 ©2020 Author(s)
Version
Final published version
Abstract
The Karlsruhe Tritium Neutrino (KATRIN) experiment aims at measuring the effective electron neutrino mass with a sensitivity of 0.2 eV/c[superscript 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 concentrations c[subscript x] for all six hydrogen isotopologues were monitored simultaneously, with a measurement precision for individual components of the order 10[superscript -3] or better throughout the complete KATRIN data taking campaigns to date. From these, the tritium purity, ε[subscript T] is derived with precision of 10[superscript -3] and trueness of 3 x 10[superscript -3], being within and surpassing the actual requirements for KATRIN, respectively.
Subjects
United States Department of Energy (grants DE-FG02-97ER41020, DE-FG02-94ER40818, DE-SC0004036, DE-FG02-97ER41033, DE-FG02-97ER41041, DE-AC02-05CH11231, DE-SC0011091, and DE-SC0019304)
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.3390/s20174827
