Ion dynamics and oscillation frequencies in a linear combined trap

被引:10
作者
Nakamura, T
Ohtani, S
Wada, M
Okada, K
Katayama, I
Schuessler, HA
机构
[1] RIKEN, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan
[2] Univ Electrocommun, Inst Laser Sci, Tokyo 1828585, Japan
[3] Sophia Univ, Dept Phys, Chiyoda Ku, Tokyo 1028554, Japan
[4] High Energy Accelerator Res Org, KEK, Inst Particle & Nucl Study, Tsukuba, Ibaraki 3050801, Japan
[5] Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA
关键词
D O I
10.1063/1.1345514
中图分类号
O59 [应用物理学];
学科分类号
摘要
Ion traps have been pivotal in opening new frontiers for the precision spectroscopy of stable ions. We report on the demonstration of an additional ion trap: the linear combined trap. This device is particularly well suited for trapping ions with unstable nuclei, due to its large range of stability parameters that facilitates external injection online to an accelerator. The motion of an ion in such a linear combined trap is investigated theoretically and experimentally. In the trap ions oscillate harmonically in the radial direction and move nearly harmonically between fixed boundaries along the longitudinal axis. The presence of a homogeneous magnetic field and the applied dc and rf electric fields, lead to a set of coupled Mathieu equations. Their approximate solutions exhibit motional frequencies, which are combinations of shifted macromotion frequencies and the cyclotron frequency. The dependence of these motional frequencies on the applied trapping fields was studied in detail. For the measurements we used small clouds of laser cooled Be-9(+) ions and crystallized Be-9(+) ions. The observed oscillation frequencies are compared to both the results of zeroth order analytical solutions and to numerical simulations in which the frequency spectrum was obtained from the ion orbits by using the fast fourier transform formalism. The various motional resonances were experimentally recorded by applying a weak dipole excitation field to one of the trap electrodes, and by simultaneously observing at resonance the changes in the fluorescence intensity. Depending on the detuning of the cooling laser the ions gain energy during the motional excitation process in such a way that they are shifted further in or out of optical resonance by the Doppler effect. This leads to either positive or negative ion motion signals at the various ion oscillation frequencies. (C) 2001 American Institute of Physics.
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收藏
页码:2922 / 2931
页数:10
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