Positron accumulation in the GBAR experiment

Positron accumulation in the GBAR experiment
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GBAR 实验中的正电子积累

DOI:
10.1016/j.nima.2022.167263
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发表时间:
2022
期刊:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
影响因子:
--
通讯作者:
Charlton M. et al.
Charlton M. et al.
中科院分区:
--
文献类型:
--
作者:
Blumer P.;Charlton M. et al.

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介绍了一种由三级缓冲气体阱(BGT)和高场潘宁阱(HFT)组成的GBAR正电子(e+)俘获装置,并讨论了它的性能。GBAR实验的总体目标是测量中性反氢(H <$)原子在地球引力场中的加速度,方法是中和一个冷却到低温的正反氢离子(H <$+),并观察自由落体后H <$的湮灭。为了产生一个H+离子,需要大约1 010个正电子和大约1 07个反质子,这些正电子被有效地转化为正电子素(Ps)。从电子直线加速器系统中产生的正电子首先在BGT中积累,然后在超高真空HFT中堆叠,在那里我们已经能够在1100 s内捕获1.4(2)× 109个正电子。
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 1 0 10 positrons, efficiently converted into positronium (Ps), together with about 1 0 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)× 10 9 positrons in 1100 s.
正电子聚束和静电传输系统,用于产生致密正电子云并将其发射到真空中
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