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脉冲慢正电子束流的直流化装置

A Device Used in Pulsed Slow Positron Beam's Stretching
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摘要 在基于加速器的北京慢正电子强束流装置上,用Penning-Trap技术实现了脉冲慢正电子束流的存储和直流化.实验表明,系统的真空度对正电子的存储效率有严重影响,脉冲正电子的释放方式决定了直流化后束流的能量分散;改变释放级信号波形以及释放方式可以得到能量分散小于1eV的准直流化慢正电子束流. A slow positron beam's stretching device has been designed and constructed on Beijing Slow Positron Beam, which based on a 1.3GeV linac. Positron was storage and stretching use Penning-Trap technique. Measurements show that the positron storage time strongly depends on the vacuum level in Penning Trap tube. Two modes was used to release the positrons from storage part, lowering Vc while VB kept constant and rising VB while Vc kept constant. This technique makes the pulsed positron beam to a quasi-continuous beam. The energy spread of positrons depend on in release mode. In the latter mode, we observe that the energy spread was reduced to a value less than 1.0eV. The time profile in user-defined waveform is more uniform. It is beneficial to reduce the probability of amplifier pileup especially in the case of measurement with high counting rate.
出处 《高能物理与核物理》 CSCD 北大核心 2006年第10期1010-1013,共4页 High Energy Physics and Nuclear Physics
基金 国家自然科学基金(10475096 10575112)资助~~
关键词 彭宁离子阱 直流化 慢正电子束流 正电子湮没 Penning-Trap, stretching, slow positron beam, positron annihilation
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参考文献6

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