Sympathetically cooled and compressed positron plasma

Sympathetically cooled and compressed positron plasma
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DOI:
10.1103/physreva.67.063406
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发表时间:
2003-06-01
期刊:
影响因子:
2.9
通讯作者:
Mitchell, TB
Mitchell, TB
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Jelenkovic, BM;Newbury, AS;Mitchell, TB

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本文报道了激光冷却的Be-9(+)离子在潘宁离子阱中对几千个正电子的共振冷却和压缩。观察到的两种物质的离心分离意味着正电子和Be-9(+)离子的近似刚性旋转,以及与Be-9(+)离子密度相当的正电子密度大于或接近4 × 10(9)cm(-3)。我们利用分离的尖锐性,将平行于磁场运动的正电子温度的上限设为5 K。在我们的室温潘宁阱中,正电子的寿命大于两周。
We report sympathetic cooling and compression of a few thousand positrons by laser-cooled Be-9(+) ions in a Penning ion trap. The observed centrifugal separation of the two species implies approximate rigid rotation of the positrons and Be-9(+) ions, and a positron density comparable to the Be-9(+) ion density of greater than or similar to4x10(9) cm(-3). We use the sharpness of the separation to place a 5-K upper limit on the positron temperature of motion parallel to the magnetic field. The positron lifetime is greater than two weeks in our room-temperature Penning trap.