Laser cooling of a small number of Be+ ions in a penning trap |
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Authors: | H Imajo S Urabe K Hayasaka M Watanabe R Hayashi |
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Institution: | (1) Communications Research Laboratory, Kansai Advanced Research Center, 588-2 Iwaoka, Iwaoka-cho, Nishi-ku, Kobe-shi, 651-24 Hyogo, Japan;(2) Faculty of Engineering, Kagoshima University, Kohrimoto, Kagoshima-shi, 890 Kagoshima, Japan |
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Abstract: | Be+ ions stored in a Penning trap were cooled by a laser beam perpendicular to the magnetic field. The cooled ions are strongly coupled and phase transitions of up to 100 ions were observed. In experiments with only a few ions stored in the trap, a stepwise decrease in fluorescence intensity was observed. All steps are of the same size and so every step is attributed to a single ion. The discrete changes in fluorescence occurred more frequently when the background pressure was increased, caused by collisions between stored ions and background neutral molecules. |
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Keywords: | 32 80 Pj 05 70 Fh 34 40 +n |
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