New source of dense, cryogenic positron plasmas -: art. no. 025002
New source of dense, cryogenic positron plasmas -: art. no. 025002
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DOI：
10.1103/physrevlett.95.025002
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发表时间：
2005-07-08
影响因子：
8.6
通讯作者：
Yamazaki, Y
中科院分区：
文献类型：
--
作者：
Jorgensen, LV;Amoretti, M;Yamazaki, Y
我们发展了一种基于预积累等离子体弹道转移的新方法，在低温环境中获得大而致密的正电子等离子体。该方法包括将从具有低磁场（0.14 T）和相对高的压力（10（-9）mbar）的区域发出的等离子体转移到浸没在具有优于10（-13）mbar的基础压力的3 T磁场中的15 K Penning-Malmberg阱中。在高场低温阱中实现的正电子积累率比以前最有效的UHV兼容方案高出一个半数量级以上。随后的叠加导致等离子体含有超过1.2x10（9）个正电子，比以前报道的高出4倍。使用旋转壁电场，包含约20 × 10（6）正电子的等离子体被压缩到2.6 × 10（10）cm（-3）的密度。这比早期的测量结果提高了6倍。
We have developed a new method, based on the ballistic transfer of preaccumulated plasmas, to obtain large and dense positron plasmas in a cryogenic environment. The method involves transferring plasmas emanating from a region with a low magnetic field (0.14 T) and relatively high pressure (10(-9) mbar) into a 15 K Penning-Malmberg trap immersed in a 3 T magnetic field with a base pressure better than 10(-13) mbar. The achieved positron accumulation rate in the high field cryogenic trap is more than one and a half orders of magnitude higher than the previous most efficient UHV compatible scheme. Subsequent stacking resulted in a plasma containing more than 1.2x10(9) positrons, which is a factor 4 higher than previously reported. Using a rotating wall electric field, plasmas containing about 20x10(6) positrons were compressed to a density of 2.6x10(10) cm(-3). This is a factor of 6 improvement over earlier measurements.