GBAR实验中的正电子累积
Positron accumulation in the GBAR experiment
AI总结：
本文描述了GBAR实验中由三级缓冲气体阱和高场彭宁阱组成的正电子俘获装置，实现了1100秒内俘获1.4(2)×10^9个正电子，为反氢引力测量提供关键正电子源。
摘要：
我们介绍了GBAR正电子（e+）俘获装置的描述，该装置由一个三级缓冲气体阱（BGT）和一个高场彭宁阱（HFT）组成，并讨论了其性能。GBAR实验的总体目标是通过中和已冷却至低温的正反氢离子（H+），并观测随后自由下落中H的湮灭，来测量中性反氢（H）原子在地球引力场中的加速度。为了产生一个H+离子，需要约10^10个正电子（高效转化为正电子素（Ps））以及约10^7个反质子（p）。正电子由基于电子直线加速器的系统产生，首先在BGT中累积，随后被堆积在超高真空HFT中，我们已能在1100秒内俘获1.4(2)×10^9个正电子。
英文摘要：
We present a description of the GBAR positron (e+) trapping apparatus, which consists of a three stage Buffer Gas Trap (BGT) followed by a High Field Penning Trap (HFT), and discuss its performance. The overall goal of the GBAR experiment is to measure the acceleration of the neutral antihydrogen (H) atom in the terrestrial gravitational field by neutralising a positive antihydrogen ion (H+), which has been cooled to a low temperature, and observing the subsequent H annihilation following free fall. To produce one H+ ion, about 10^10 positrons, efficiently converted into positronium (Ps), together with about 10^7 antiprotons (p), are required. The positrons, produced from an electron linac-based system, are accumulated first in the BGT whereafter they are stacked in the ultra-high vacuum HFT, where we have been able to trap 1.4(2) x 10^9 positrons in 1100 seconds.
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