SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 15: Instrumentation VI

HK 15.5: Vortrag

Dienstag, 21. März 2023, 18:00–18:15, SCH/A117

A nuclear magnetic resonance magnetometer for position verification of a neutron spin-flipper — •Viktoria Ermuth for the tauSPECT collaboration — Institut für Physik, Johannes Gutenberg-Universität, Mainz

To measure the free neutron lifetime the τSPECT experiment stores ultracold neutrons fully using magnetic field gradients. By flipping the spin of spin-polarized neutrons and thereby transforming high-field-seeking neutrons, whose magnetic moments are aligned with the field, to the low-field-seeking state, where the magnetic moment is aligned opposite the field, the neutrons are filled into the magnetic trap. For the spin flip to be successful the frequency of the spin flipper has to be the Lamor frequency of the neutron at that point in the magnetic field. Therefore, it is necessary to know the magnetic field at the location of the spin flipper. The magnetic field is measured using a nuclear magnetic resonance (NMR) probe to monitor the stability of the magnetic field and provide a reference for the spin flipper. Although the NMR probe does not sit directly at the spin flipper, conclusions about the field at the spin flipper can be made. Despite of environmental challenges, like cryogenic temperatures in vacuum, it is possible to measure the magnetic field with a high accuracy and a constant offset and temperature dependency.
This talk will show the construction and functionality of such an NMR probe as well as commissioning data.