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Spectroscopic Investigations of Intermolecular Effects in the KATRIN Tritium Source Loop

Krasch, Bennet ORCID iD icon 1
1 Institut für Beschleunigerphysik und Technologie (IBPT), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

The Karlsruhe Tritium Neutrino (KATRIN) experiment aims to measure the effective electron anti-neutrino mass with sensitivity of $m(\nu_\mathrm{e})=0.2$ eV (90% C.L.) by investigating the shape of the energy spectrum of the electrons released during the decay of molecular tritium near the kinematic endpoint of 18.6 keV. KATRIN uses a high luminosity tritium windowless gaseous tritium source (WGTS) with an activity of 100 GBq stabilised at the per mil level and a high voltage system with ppm stability at the spectrometer, which has an ultra-high vacuum inside.

In order to achieve the design sensitivity, it is essential to understand and quantify all the systematic effects that have an influence on the shape of the spectrum. The main focus of this work is the design, construction and set-up of a new tritium-compatible experiment for the systematic investigation of the molecular and intermolecular effects of all six hydrogen isotopologues under WGTS-like conditions. The composition of the gas at KATRIN is significantly determined by three contributions: chemical (H$_2$, HD, HT, D$_2$, DT, T$_2$), ortho-para (o-H$_2$, p-H$_2$, o-D$_2$, p-D$_2$, o-T$_2$, p-T$_2$) and dimers as the simplest form of two bound molecules (T$_2$)$_2$. ... mehr

Volltext §
DOI: 10.5445/IR/1000158844
Veröffentlicht am 23.05.2023
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Astroteilchenphysik (IAP)
Institut für Beschleunigerphysik und Technologie (IBPT)
Publikationstyp Hochschulschrift
Publikationsdatum 23.05.2023
Sprache Englisch
Identifikator KITopen-ID: 1000158844
HGF-Programm 51.13.01 (POF IV, LK 01) Neutrinophysik und Dunkle Materie
Weitere HGF-Programme 54.11.11 (POF IV, LK 01) Accelerator Operation, Research and Development
Verlag Karlsruher Institut für Technologie (KIT)
Umfang xi, 163 S.
Art der Arbeit Dissertation
Fakultät Fakultät für Physik (PHYSIK)
Institut Institut für Astroteilchenphysik (IAP)
Prüfungsdatum 17.02.2023
Schlagwörter neutrino mass, intermolecular effects, Raman and infrared absorption sspectroscopy, tritium technology, cryogenic, gas composition monitoring
Referent/Betreuer Drexlin, Guido
Engel, Ralph
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