Stochastic cooling of the radial motion in a Penning trap

V. Lagomarsino, G. Manuzio, G. Testera
1991 Physical Review A. Atomic, Molecular, and Optical Physics  
Doppler and sideband cooling are long-standing techniques that have been used together to prepare trapped atomic ions in their ground state of motion. In this paper we study how these techniques can be extended to cool both radial modes of motion of a single ion in a Penning trap. We numerically explore the prerequisite experimental parameters for efficient Doppler cooling in the presence of an additional oscillating electric field to resonantly couple the radial modes. The simulations are
more » ... imulations are supported by experimental data for a single 40 Ca + ion Doppler cooled to ∼100 phonons in both radial modes at a magnetron frequency of 52 kHz and a modified cyclotron frequency of 677 kHz. For these frequencies, we then show that mean phonon numbers of 0.35(5) for the modified cyclotron and 1.7(2) for the magnetron motions are achieved after 68 ms of sideband cooling.
doi:10.1103/physreva.44.5173 pmid:9906571 fatcat:3fa5e3yvqrclxit5abnvzgjr3a