SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 15: Instrumentation VI

HK 15.3: Vortrag

Dienstag, 21. März 2023, 17:30–17:45, SCH/A117

Recent developments at the sources for ultra-cold neutrons located at the TRIGA research reactor Mainz — •Simon Kaufmann for the tauSPECT collaboration — Department of Chemistry, TRIGA site, Johannes Gutenberg University Mainz

Neutrons created by fission inside the TRIGA research reactor have kinetic energies in the range of MeV. When they are moderated in the range below kinetic energies of 350 neV, they are called ultra-cold neutrons (UCNs). Using materials with a larger Fermi potential than the kinetic energies allows to guide and trap these UCNs. This makes UCNs especially attractive for a variety of neutron based experiments.

In order to provide these UCNs, two UCN-sources are currently operated regularly at TRIGA’s beam ports C&D. While the source at beam port C is mainly operated in a continuous irradiation mode of the reactor, the one at beam port D is operated in a pulsed mode of the reactor. Both face the challenge of converting the kinetic energy of the neutrons from MeV down to neV with a solid deuterium crystal as the main converter. Their efficiency is strongly influenced by the structure of the crystal. This structure can be influenced by controlled thermal changes in order to increase the conversion efficiency.

This talk will present the latest measurements that were performed at beam port D with the aim to create a controlled thermal change sequence to increase and saturate the moderation efficiency.