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A: Fachverband Atomphysik
A 3: Precision spectroscopy of atoms and ions I (joint session A/Q)
A 3.2: Vortrag
Montag, 14. März 2022, 14:15–14:30, A-H2
Implementing Sympathetic Laser Cooling and a Josephson Junctions based Voltage Source for the Measurement of the Nuclear Magnetic Moment of 3He2+ — •Annabelle Kaiser1, Antonia Schneider1, Andreas Mooser1, Stefan Dickopf1, Marius Müller1, Alexander Rischka1, Stefan Ulmer2, Jochen Walz3, and Klaus Blaum1 — 1Max-Planck Institute for Nuclear Physics, Heidelberg, Germany — 2RIKEN, Wako, Japan — 3Johannes Gutenberg-University and Helmholtz-Institute, Mainz, Germany
The Heidelberg 3He-experiment is aiming at the first direct high-precision measurement of the nuclear magnetic moment of 3He2+, with a relative uncertainty on the 10−9 level. The helion nuclear magnetic moment is an important parameter for the development of hyperpolarized 3He-NMR-probes for absolute magnetometry.
The measurement is performed using a cryogenic four Penning-trap setup, with techniques presented in [1]. To achieve the mandatory frequency stability for spin-state detection, a single 3He2+ ion will be prepared at temperatures of a few mK via sympathetic laser cooling with 9Be+. To further improve the stability, the noise generated by the voltage sources applied to the trap electrodes can be reduced by implementing Josephson junctions as a voltage source. The tuning will be achieved by switching a low-noise DAC in series to the Josephson junctions, aiming at an absolute voltage stability better than 70nV over two minutes. The setup and status of the project will be presented.
[1] Mooser et al, J. Phys.: Conf. Ser. 1138 012004 (2018)