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
影响因子:
2.9
通讯作者:
Mitchell, TB
中科院分区:
文献类型:
--
作者:
Jelenkovic, BM;Newbury, AS;Mitchell, TB
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.