Josephson voltage standards as ultra-stable low-noise voltage sources for precision Penning-trap experiments

Abstract:

A high-precision Penning-trap experiment was operated with a programmable 20 V Josephson voltage source, providing a significantly higher stability of the electrostatic trapping potential. This increased the motional frequency stability of a trapped ion by about a factor of two with respect to state-of-the-art voltage sources. An absolute axial frequency stability of 7.8(6) mHz corresponding to a relative precision of 9.7(8) x 10^-9 at 795 kHz was demonstrated using a trapped ⁹Be³⁺ ion as a measurement probe. The enhanced stability in the trapping potential opens up the possibility for improved determinations of the proton and antiproton magnetic moments and direct high-precision measurements of the nuclear magnetic moments of ²H, ³He, and ⁷Li. In the field of mass spectrometry, the developments will enable measurements of cyclotron frequency ratios and, thus, mass ratio measurements with unprecedented relative statistical uncertainties below the 10^-12 level.

A. Kaiser, S. Dickopf, M. Door, R. Behr, U. Beutel, S. Eliseev, A. Kaushik, K. Kromer, M.
Müller, L. Palafox, S. Ulmer, A. Mooser, K. Blaum, „Josephson voltage standards as ultrastable
low-noise voltage sources for precision Penning-trap experiments “, Appl. Phys. Lett.
124, 224002 (2024).

https://doi.org/10.1063/5.0206779

Related to Project B01