A Method of Measuring the Axial Secular Motion Temperature of Trapping Large Size Ion Clouds
YANG Yu-Na1,2,3**, LIU Hao1,2,3, HE Yue-Hong1,2,3, LI Hai-Xia1,2,3, CHEN Yi-He1,2, SHE Lei1,2, CHEN Liang2, LI Jiao-Mei1,2
1Key Laboratory of Atomic Frequency Standards (KLAFS), Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 2State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 3University of the Chinese Academy of Sciences, Beijing 100049
A large cloud of 40Ca+ is successfully trapped and manipulated in a linear ion trap. The axial length of the ion cloud is measured under a series of end-cap voltages. We propose a method of measuring the axial secular motion temperature of the ion cloud by analyzing its image on an electron-multiplying CCD. The method is based on the Boltzmann equation that the axial density distribution of ions at secular motion temperature T satisfies. The axial secular motion temperature of the ion cloud is also obtained by measuring the Doppler broadened line width. For the same trapping parameters, the axial secular motion temperature by analyzing the image of ion cloud is 840 K and by fitting the experimental resonance line profile is 700 K.
. [J]. 中国物理快报, 2013, 30(3): 30501-030501.
YANG Yu-Na, LIU Hao, HE Yue-Hong, LI Hai-Xia, CHEN Yi-He, SHE Lei, CHEN Liang, LI Jiao-Mei. A Method of Measuring the Axial Secular Motion Temperature of Trapping Large Size Ion Clouds. Chin. Phys. Lett., 2013, 30(3): 30501-030501.
2013, Vol. 30 
