Design and Assembly of a Compact Penning Trap with In-Vacuum, Thermally-Stable Permanent Magnets

We present an updated design of a compact permanent-magnet Penning trap for atomic sensing and quantum information applications. Design advances include the in-vacuum placement of a pair of SmCo alloy magnets with low temperature coefficients to achieve a magnetic field stable to temperature fluctuations. The new design also includes a pair of printed circuit boards with a 12-fold segmented ring electrode for trapping, harmonic compensation, and the creation of various 'rotating wall' potentials. We describe the characterization of the magnetic field and the shimming process used to optimize magnetic field uniformity at the trap center. Plans for the addition of high-finesse mirrors for cavity-enhanced applications are also presented.