Simulation and Optimization of Miniature Ring-Endcap Ion Traps
CAO Jian1,2,3, TONG Xin1,2, CUI Kai-Feng1,2,3, SHANG Jun-Juan1,2,3, SHU Hua-Lin1,2, HUANG Xue-Ren1,2**
1State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 2Key Laboratory of Atomic Frequency Standards, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 3Graduate University of Chinese Academy of Sciences, Beijing 100080
Abstract：With the decrease in dimension of ion traps employed in optical frequency standards and precision spectroscopy, the sensitivity of trapping behavior to trap geometry is more and more prominent. We present a guide for the design and construction of a miniature trap for a single ion confinement, and propose an optimized combination of rring/rendcap≈0.5 and z0≈r0 within the range of r0=0.7±0.2 mm. Compared with the trap used by Huang et al. [Phys. Rev. A 84 (2011) 053841], the design can lead to an increase in trap pseudo-potential of more than 20% and a reduction on potential anharmonicity of more than 90%. The improvements make the trap closer to an ideal hyperboloidal trap to confine a single ion tightly with the benefit of weaker micro-motion. Considering the imperfection of electrodes machining and traps alignment, we also demonstrate the importance of trap symmetry, especially on two endcap electrodes.
2014, Vol. 31 
