Machacek J R, Buckman S J, Sullivan J P
Plasma Research Laboratory, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia.
Rev Sci Instrum. 2020 Mar 6;91(3):033311. doi: 10.1063/1.5128012.
We describe the operation of a pulsed positronium beam based on a two-stage buffer gas positron trap (BGT) or a Surko trap. The BGT allows the areal density and temporal spread of the positron beam to be tailored. This tailored positron beam is used to form a positronium beam via charge exchange with an atomic or molecular gas. The resulting positronium beam is energy tunable, and the collimated beam relies on the angular differential positronium production cross section of the atomic or molecular gas used.
我们描述了基于两级缓冲气体正电子阱（BGT）或苏尔科阱的脉冲正电子素束的运行情况。BGT可使正电子束的面密度和时间展宽得到调整。这种经过调整的正电子束通过与原子或分子气体进行电荷交换来形成正电子素束。所产生的正电子素束能量可调，且准直束依赖于所用原子或分子气体的角微分正电子素产生截面。
