Characterisation of the KATRIN tritium source and evaluation of systematic effects

The Karlsruhe Tritium Neutrino (KATRIN) Experiment aims to measure the effective electron antineutrino mass with a sensitivity of 200 meV (90 % C. L.) by analysing the kinematic endpoint of the tritium beta-electron spectrum. In this thesis, the systematic effects of KATRIN are evaluated. Since most of them are linked to the tritium source, the source cryostat performance is fully characterised in this work. With a dedicated measurement campaign performed with krypton-83m, energy scale-related systematic effects are investigated and the great capabilities of KATRIN in high-resolution spectroscopy of keV-scale electrons are demonstrated

Improving the Detection Limit in a Capillary Raman System for In Situ Gas Analysis by Means of Fluorescence Reduction

Raman spectroscopy for low-pressure or trace gas analysis is rather challenging, in particular in process control applications requiring trace detection and real-time response; in general, enhancement techniques are required. One possible enhancement approach which enjoys increasing popularity makes use of an internally-reflective capillary as the gas cell. However, in the majority of cases, such capillary systems were often limited in their achievable sensitivity by a significant fluorescence background, which is generated as a consequence of interactions between the laser light and optical glass components in the setup. In order to understand and counteract these problems we have investigated a range of fluorescence-reducing measures, including the rearrangement of optical elements, and the replacement of glass components--including the capillary itself--by metal alternatives. These studies now have led to a capillary setup in which fluorescence is practically eliminated and substantial signal enhancement over standard Raman setups is achieved. With this improved (prototype) setup, detection limits of well below 1 mbar could be obtained in sub-second acquisition times, demonstrating the potential of capillary Raman spectroscopy for real-time, in situ gas sensing and process control applications, down to trace level concentrations

First stability measurements of the KATRIN WGTS cryostat performance

<p>The KATRIN experiment measures the electron antineutrino mass with a sensitivity of 0.2eV/<em>c</em>2. This goal sets strong requirements on the systematic uncertainties of the measurement. One main systematic uncertainty is related to the stability of operational parameters of the Windowless Gaseous Tritium Source (WGTS). These have to be monitored and controlled on the per mille level. To achieve the temperature stability of one per mille at the two operational temperatures 30K and 100K, a novel cooling system with liquid noble gases was developed by the KATRIN collaboration. The poster reports of the first tests of the WGTS cooling system during the last year, which demonstrated the outstanding performance of the cryostat with a temperature stability being one order of magnitude better than envisaged. The same was demonstrated for the magnetic field stability of the seven superconducting magnets of the WGTS with field strengths up to 3.9T.</p

Nationale Forschungsdateninfrastruktur (NFDI) e. V.: Aufbau und Ziele

Bund und Länder haben den Verein Nationale Forschungsdateninfrastruktur (NFDI) e. V. gegründet, um ein systematisches und nachhaltiges Forschungsdatenmanagement in Deutschland zu fördern. Im Verein vernetzen sich bis zu 30 Konsortien, die mit ihren Mitgliedsorganisationen die Wissenschaftslandschaft in Deutschland abbilden. Gemeinsam erarbeiten diese im Verein Datenstandards nach den FAIR Prinzipien und weitere Lösungen rund um das disziplinenübergreifende Forschungsdatenmanagement. In diesem Artikel stellt das Direktorat Aufbau und Ziele des neu gegründeten Vereins vor

Nationale Forschungsdateninfrastruktur (NFDI) e. V.: Aufbau und Ziele

Bund und Länder haben den Verein Nationale Forschungsdateninfrastruktur (NFDI) e. V. gegründet, um ein systematisches und nachhaltiges Forschungsdatenmanagement in Deutschland zu fördern. Im Verein vernetzen sich bis zu 30 Konsortien, die mit ihren Mitgliedsorganisationen die Wissenschaftslandschaft in Deutschland abbilden. Gemeinsam erarbeiten diese im Verein Datenstandards nach den FAIR Prinzipien und weitere Lösungen rund um das disziplinenübergreifende Forschungsdatenmanagement. In diesem Artikel stellt das Direktorat Aufbau und Ziele des neu gegründeten Vereins vor

Survey of Open Data Concepts Within Fundamental Physics: An Initiative of the PUNCH4NFDI Consortium

Enke H, Haungs A, Schörner-Sadenius T, et al. Survey of Open Data Concepts Within Fundamental Physics: An Initiative of the PUNCH4NFDI Consortium. Computing and Software for Big Science. 2022;6(1): 6.**Abstract** PUNCH4NFDI (Particles, Universe, NuClei and Hadrons for the NFDI) aims at developing concepts and tools for the efficient management of digital research products in fundamental physics research. At the heart of the research products are scientific data sets that should be made interoperable and available to a broad scientific community and the public for a sustainable usage (“open data”). The first PUNCH4NFDI “Open Data Workshop” gave the opportunity for an initial survey of existing and planned open data initiatives within the PUNCH science field. The paper addresses the conceptual differences and commonalities of the participating communities presented in the workshop. Existing open data collections were presented and discussed. This is an inquiry into the community’s requirements for a better use of open data and in this context also of “Open Science”

First operation of the KATRIN experiment with tritium

The determination of the neutrino mass is one of the major challenges in astroparticle physics today. Direct neutrino mass experiments, based solely on the kinematics of β β -decay, provide a largely model-independent probe to the neutrino mass scale. The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to directly measure the effective electron antineutrino mass with a sensitivity of 0.2 eV 0.2 eV (90% 90% CL). In this work we report on the first operation of KATRIN with tritium which took place in 2018. During this commissioning phase of the tritium circulation system, excellent agreement of the theoretical prediction with the recorded spectra was found and stable conditions over a time period of 13 days could be established. These results are an essential prerequisite for the subsequent neutrino mass measurements with KATRIN in 2019