Speaker
Description
David Frese, Marcus Lai, Genrich Zeller, Caroline Rodenbeck, Magnus Schlösser for the TLK ATS Team
The current world leading upper limit on the neutrino mass is provided by the KATRIN Experiment with $m_\nu<0.45\,$eV/c$^2$. To improve the sensitivity on the neutrino mass by at least one order of magnitude new technologies are necessary. In addition to new detector technologies, transitioning from a molecular tritium source to an atomic tritium source is required. The Karlsruhe Mainz Atomic Tritium Experiment (KAMATE) collaboration aims to find the most suitable technology to dissociate T$_2$ and cool and trap T. For this, dedicated tools for atomic tritium beam diagnostics are being investigated. Alongside to a Quadrupole Mass Spectrometer (QMS) and a wire detector, graphene-based atomic sensor is currently under development.
In this work, a graphene-setup is presented to investigate a nonradioactive hydrogen-beam emitted from a plasma-based dissociator. In contrast to molecular hydrogen, atomic hydrogen (and tritium) can chemisorb to graphene. This leads to sp³-bounds in the graphene lattice. This effect is investigated in a twofold manner: By analyzing the D'/D ratio in ex-situ Raman microscopy sp³-type defects can be distinguished from vacancy defects. In addition, in-situ sheet resistance measurements are conducted. By heating the graphene sample to 300°C, atoms desorb whereas vacancies remain which allows to measure the atomic adsorption as well. The poster will present Raman scans of loaded graphene samples, the contacting setup for the resistivity measurements and the first loading and heating results.
| Collaboration or Other Affiliation | Other |
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