Doppler Cooled Ions in a Compact, Reconfigurable Penning Trap

Abstract

We report the design and experimental demonstration of a compact, reconfigurable Penning ion trap constructed with rare-earth permanent magnets placed outside of a trap vacuum enclosure. We describe the first observation of Doppler laser cooling of ions in a permanent magnet Penning trap. We detail a method for quantifying and optimizing the trap magnetic field uniformity in situ using a thermal beam of neutral ${}^{40}$Ca precursor atoms. Doppler laser cooling of ${}^{40}$Ca${}^{+}$ is carried out at 0.65~T, and side-view images of trapped ion fluorescence show crystalline order for both two- and three-dimensional arrays. Measured ${}^{40}$Ca${}^{+}$ trap frequencies confirm the magnetic field characterization with neutral ${}^{40}$Ca. The compact trap described here enables a variety of cold ion experiments with low size, weight, power, and cost requirements relative to traditional electromagnet-based Penning traps.

arXiv comment5 pages, 4 figures, supplemental material

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Cited by in corpus (11)

• Broadening of the drumhead mode spectrum due to in-plane thermal fluctuations of two-dimensional trapped ion crystals in a Penning trap
• Second-Scale ${}^9{\text{Be}}^{+}$ Spin Coherence in a Compact Penning Trap
• Normal Modes, Rotational Inertia, and Thermal Fluctuations of Trapped Ion Crystals
• Bilayer crystals of trapped ions for quantum information processing
• Individual-Ion Addressing and Readout in a Penning Trap
• A magneto-optical trap with millimeter ball lenses
• Comparison of Spontaneous Emission in Trapped Ion Multiqubit Gates at High Magnetic Fields
• Equilibration of the planar modes of ultracold two dimensional ion crystals in a Penning trap
• Rapid cooling of the in-plane motion of two-dimensional ion crystals in a Penning trap to millikelvin temperatures
• Penning-trap eigenfrequency measurements with optical radiofrequency detectors
• Absorption Spectroscopy of ${}^{40}$Ca Atomic Beams Produced via Pulsed Laser Ablation: A Quantitative Comparison of Ca and CaTiO${}_3$ Targets