A high-precision rf trap with minimized micromotion for an In+ multiple-ion clock
Abstract
We present an experiment to characterize our new linear ion trap designed for the operation of a many-ion optical clock using 115-In^+ as clock ions. For the characterization of the trap as well as the sympathetic cooling of the clock ions we use 172-Yb^+. The trap design has been derived from finite element method (FEM) calculations and a first prototype based on glass-reinforced thermoset laminates was built. This paper details on the trap manufacturing process and micromotion measurement. Excess micromotion is measured using photon-correlation spectroscopy with a resolution of 1.1nm in motional amplitude, and residual axial rf fields in this trap are compared to FEM calculations. With this method, we demonstrate a sensitivity to systematic clock shifts due to excess micromotion of |({\Delta}{\nu}/{\nu})| = 8.5x10^-20. Based on the measurement of axial rf fields of our trap, we estimate a number of twelve ions that can be stored per trapping segment and used as an optical frequency standard with a fractional inaccuracy of \leq 1x10^-18 due to micromotion.
Cite
@article{arxiv.1206.5111,
title = {A high-precision rf trap with minimized micromotion for an In+ multiple-ion clock},
author = {Karsten Pyka and Norbert Herschbach and Jonas Keller and Tanja E. Mehlstäubler},
journal= {arXiv preprint arXiv:1206.5111},
year = {2015}
}
Comments
19 pages with 14 pictures