Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 19: Precision Spectroscopy of Atoms and Ions II (joint session A/Q)
A 19.1: Talk
Wednesday, March 13, 2024, 11:00–11:15, HS 1098
An ultra stable dc voltage source for ion trap experiments — •Dina-C. Rensink1, Peter Micke2,5, Markus Wiesinger2, Christian Will2, Hüseyin Yildiz1, Christian Smorra1,4, Jochen Walz1,3, and Stefan Ulmer6,4 — 1Johannes Gutenberg-Universität Mainz — 2Max-Planck-Institut für Kernphysik, Heidelberg — 3Helmholtz-Institut Mainz — 4RIKEN, Wako, Japan — 5Helmholtz-Institut Jena — 6Heinrich-Heine-Universität Düsseldorf
Highly stable voltages are crucial for precision ion traps. We are developing and characterizing a suitable voltage source for the BASE (Baryon-Antibaryon Symmetry Experiment) collaboration at CERN, which operates several Penning traps. These precision traps are used to perform test of the fundamental symmetry (CPT) between matter and antimatter with (anti-)protons, for instance via comparison of the g-factors. The determination of these quantities requires several frequency measurements whose precision can be limited by the stability of the voltages which bias the trap electrodes.
For this purpose, one ultra-stable LTZ1000 voltage reference and five 20 bit DACs have been combined into a programmable 5-channel voltage source. This scalable setup aims at long-term stability, low temperature drift, µV resolution over a ± 10 V range, and an output current of up to 20 mA per channel. Prior tests with a 2-channel prototype indicate a fractional stability of < 5 · 10−8 at τ = 102...103 s (at 7 V). The status of the project will be presented and the performance of the voltage source will be discussed.