Excess micromotion compensation of trapped ions in a linear Paul trap for trace isotope analysis |
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| Authors: | Kyunghun Jung Yuta Yamamoto Shuichi Hasegawa |
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| Affiliation: | 1. Nuclear Professional School, The University of Tokyo, Ibaraki, Japan;2. Department of Nuclear Engineering and Management, The University of Tokyo, Tokyo, Japan;3. Department of Nuclear Engineering and Management, The University of Tokyo, Tokyo, Japan |
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| Abstract: | Excess micromotion of trapped calcium ions was detected and compensated in our linear Paul trap apparatus for trace isotope analysis. The micromotion was detected by Charge-coupled device (CCD). camera and radio frequency (rf) correlation method. We found that 230 and 2280 V of compensation voltages were needed for x- and y-axis compensation in our apparatus, respectively. The z-axis micromotion was confirmed by the experiment and its cause was investigated by finding a shape of z-axis confinement field. The confinement field was indeed distorted in our apparatus and it gave rise to the trapped ion to shift from potential center. And the micromotion of r-direction was transferred to the z-axis by the distorted confinement field. The z-axis micromotion was suppressed by increasing cap voltage of trap. |
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| Keywords: | Trace isotope analysis ion trap calcium ion isotope micromotion |
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