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Accurate Calibration of Raman Systems

At the Karlsruhe Tritium Neutrino Experiment

  • Book
  • © 2014

Overview

Authors:
  1. Magnus Schlösser

    1. Tritium Laboratory Karlsruhe, Karlsruhe Institute of Technology Institute for Technical Physics, Eggenstein-Leopoldshafen, Germany

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  • Nominated as an outstanding Ph.D. thesis by Karlsruhe Institute of Technology, Germany
  • Demonstrates how the tritium source composition of a neutrino mass experiment can be accurately measured by Raman spectroscopy
  • Explains how Raman systems can be calibrated accurately for all six hydrogen without the use of a sample-based method
  • Contains Raman depolarization measurement of all six hydrogen isotopologues which agree within the experimental uncertainty with the theoretical predictions
  • Includes supplementary material: sn.pub/extras

Part of the book series: Springer Theses (Springer Theses)

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Table of contents (8 chapters)

  1. Front Matter

    Pages i-xii
    Download chapter PDF

  2. Introduction

    • Magnus Schlösser
    Pages 1-30

  3. The KATRIN Experiment

    • Magnus Schlösser
    Pages 31-51

  4. Theory of Quantitative Raman Spectroscopy

    • Magnus Schlösser
    Pages 53-74

  5. Experimental Setup

    • Magnus Schlösser
    Pages 75-100

  6. Calibration Based on Theoretical Intensities and Spectral Sensitivity (Method I)

    • Magnus Schlösser
    Pages 101-149

  7. Calibration Based on Accurate Gas Samples (Method II)

    • Magnus Schlösser
    Pages 151-169

  8. Comparison of Calibration Methods

    • Magnus Schlösser
    Pages 171-175

  9. Summary and Outlook

    • Magnus Schlösser
    Pages 177-182

  10. Back Matter

    Pages 183-225
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Keywords

About this book

Neutrinos can arguably be labeled as the most fascinating elementary particles known as their small but non-zero rest mass points to new mass generating mechanisms beyond the Standard Model, and also assigns primordial neutrinos from the Big Bang a distinct role in shaping the evolution of large-scale structures in the universe. The open question of the absolute neutrino mass scale will be addressed by the Karlsruhe Tritium Neutrino (KATRIN) experiment, currently under construction.
This thesis reports major contributions to developing and implementing new laser-spectroscopic precision tools to continuously monitor the isotope content of the windowless gaseous tritium source of KATRIN. The method of choice, Raman spectroscopy, is ideally suited for in-situ monitoring of all six hydrogen isotopologues. In a series of beautiful experiments the author obtained two independent novel calibration methods, first based on a comparison of experimental Raman depolarization ratios with corresponding quantum-chemical calculations, and second on a gas sampling technique. Both methods yield consistent cross-calibration results and, as well as yielding improvements in precision, will be of major importance in reducing systematic effects in long-term neutrino mass measurements. The methods developed in this thesis also have great potential to further broaden the applications of Raman spectroscopy to study extended sources such as in atmospheric physics.

Authors and Affiliations

  • Tritium Laboratory Karlsruhe, Karlsruhe Institute of Technology Institute for Technical Physics, Eggenstein-Leopoldshafen, Germany

    Magnus Schlösser

About the author

Dr. Magnus Schlösser is an experimental physicist with research interests in optical spectroscopy and astroparticle physics. He graduated at the Karlsruhe Institute of Technology in 2009 and was awarded a PhD with distinction in 2013. The PhD project was conducted at the interface of his research interests by developing, characterising and calibrating a Raman system for the accurate measurement of the isotopic purity of the gaseous tritium source at the Karlsruhe Tritium Neutrino Experiment. During the time of the PhD studies he contributed to more than 10 scientific publications and has presented his work at international and national scientific conferences, as well as to the public. Currently, he is investigating further applications of optical spectroscopy for tritium process technology and beyond, with the aim of enhanced sensitivity, high versatility and long-term stability.

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