Demonstration of a Spherical Penning Trap for Single Electrons
Zirui Fang, Xing Fan
A spherical Penning trap has well-separated, clean microwave resonances, making it attractive for precision measurements of the electron magnetic moment and for dark-photon and axion searches with trapped electrons. We demonstrate single-electron trapping in a spherical Penning trap and characterize its microwave resonance structure. The design, single-electron detection, microwave mode characterization, and advantages of this geometry are presented.
physics.atom-phCross-listedarXiv:2606.03639•Jun 3, 2026