Freiburg 2024 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 11: Precision Spectroscopy of Atoms and Ions I (joint session A/Q)
A 11.1: Vortrag
Dienstag, 12. März 2024, 11:00–11:15, HS 1098
Implementing a Josephson Voltage Standard on a Penning Trap for the Nuclear Magnetic Moment Measurements of 2D, 3He and 7Li — •Annabelle Kaiser1, Stefan Dickopf1, Marius Müller1, Ralf Behr2, Ute Beutel1, Ankush Kaushik1, Luis Palafox2, Stefan Ulmer3,4, Andreas Mooser1, and Klaus Blaum1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2Physikalisch Technische Bundesanstalt, Braunschweig, Germany — 3RIKEN, Wako, Japan — 4HHU Düsseldorf, Germany
Penning traps are versatile tools for high-precision measurements of e.g. the hyperfine structure from which atomic masses, binding energies and electron as well as nuclear magnetic moments can be extracted. For the latter, a spin-flip needs to be resolved with a change in signal that is barely detectable before the background noise, using methods described in [1]. This requires an ultra-stable trapping environment and extremely cold ion temperatures. A new technique will be presented, which reduces the noise originating from the voltage sources generating the electrostatic trapping potential: By implementing a tunable 10 V Josephson voltage standard, the stability of the ion’s axial frequency was measured to be twice as stable (10 ppb over 8 minutes, at 800 kHz absolute frequency) as with the typical low-noise voltage sources UM1-14. An environment this stable enables the direct high-precision measurements of the nuclear magnetic moment of 2D, 3He and 7Li. First results of the frequency stability improvement will be presented, along with the status of the project.
[1] Mooser et al., J. Phys.: Conf. Ser. 1138 012004 (2018)
Keywords: Precision Measurements; Penning Traps; Ultra Stable Voltage Sources; g-factor measurements