Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 18: Laser development and applications III
Q 18.1: Talk
Tuesday, March 18, 2014, 10:30–10:45, DO26 207
Enhanced sensitivity of Raman spectroscopy for tritium gas analysis using a metal-lined hollow glass fiber — •Simone Rupp1, Timothy M. James2, Helmut H. Telle2, Magnus Schlösser1, and Beate Bornschein1 — 1Institute of Technical Physics, Karlsruhe Institute of Technology, Germany — 2Department of Physics, Swansea University, United Kingdom
Raman spectroscopy is emerging as an advantageous tool for the compositional analysis of tritium-containing gases. Allowing for inline and real-time monitoring of flowing gases, it is of high interest for process control and tritium accountancy in, for example, the fuel cycle of fusion power plants, or neutrino mass experiments using tritium beta decay. Several Raman systems have been set up by our group over the past years and were successfully developed towards a high measurement precision and sensitivity. However, due to the sensitivity limits of conventional Raman spectroscopy, further improvements require new technologies. One promising approach is the use of a hollow glass fiber (capillary) acting as the Raman gas cell. The elongated scattering volume and the large light collection angle lead to a significant enhancement of the Raman signal compared to conventional setups. Such a Raman system has been constructed by our group and tested with tritiated hydrogen gases, yielding a sensitivity enhancement of at least one order of magnitude. In this contribution, a comparison of conventional and capillary Raman systems is given, and it is demonstrated that the use of a metal-lined hollow glass fiber as the Raman cell enables highly sensitive compositional analyses of tritium-containing gas.