Dortmund 2021 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 18: Neutrino physics without accelerators I
T 18.7: Vortrag
Montag, 15. März 2021, 17:35–17:50, Tr
Atom-Source Development for Project 8 — •Alec Lindman, Sebastian Böser, and Christian Matthe for the Project 8 collaboration — PRISMA+ Cluster of Excellence, JGU Mainz
The Project 8 experiment will make a direct measurement with sensitivity to much of the unexplored range of neutrino masses. Past experiments used molecular tritium, which has an unavoidable energy smearing from its final states. Project 8 will use atomic tritium to reach mβ≤40 meV. This requires O(1020) tritium atoms held at ∼60 mK in a several-cubic-meter magnetic trap. The efficiencies of cooling the atoms and their trapped lifetime require, coincidentally, 0.015 cm>1020 atoms/s from the source. Phase III of Project 8 includes building a smaller Atomic Tritium Demonstrator to confirm solutions are ready to produce, cool, and trap atomic tritium at a scale suitable for the final Phase IV experiment.
This talk will discuss experiments at JGU Mainz to develop a cold, high-flux atom source. Our tests extend to a hydrogen flow of 20 sccm, some 40 times the previously-published values for this type of source. Highlights include improved understanding of atom transport in the test stand, automated analysis of large datasets, measurements of the atom-beam profile, and a redesign that boosted the atomic signal 100-fold. Upgrades to the test stand and its instrumentation are underway to definitively determine whether the present atom source provides sufficient atomic flux. Designs for a higher-output source, if needed, and the cooling and trapping stages are in progress and will be installed on the test stand in due course.