Positron accumulation in the GBAR experiment
Abstract
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.
Cite
@article{arxiv.2205.04530,
title = {Positron accumulation in the GBAR experiment},
author = {P. Blumer and M. Charlton and M. Chung and P. Clade and P. Comini and P. Crivelli and O. Dalkarov and P. Debu and L. Dodd and A. Douillet and S. Guellati and P. -A Hervieux and L. Hilico and P. Indelicato and G. Janka and S. Jonsell and J. -P. Karr and B. H. Kim and E. S. Kim and S. K. Kim and Y. Ko and T. Kosinski and N. Kuroda and B. M. Latacz and B. Lee and H. Lee and J. Lee and A. M. M. Leitee and K. Leveque and E. Lim and L. Liszkay and P. Lotrus and D. Lunney and G. Manfredi and B. Mansoulie and M. Matusiak and G. Mornacchi and V. Nesvizhevsky and F. Nez and S. Niang and R. Nishi and B. Ohayon and K. Park and N. Paul and P. Perez and S. Procureur and B. Radics and C. Regenfus and J. -M. Reymond and S. Reynaud and J. -Y. Rousse and O. Rousselle and A. Rubbia and J. Rzadkiewicl and Y. Sacquin and F. Schmidt-Kaler and M. Staszczak and K. Szymczyk and T. Tanaka and B. Tuchming and B. Vallage and A. Voronin and D. P. van der Werf and S. Wolf and D. Won and S. Wronka and Y. Yamazaki and K. H. Yoo and P. Yzombard and C. J. Baker},
journal= {arXiv preprint arXiv:2205.04530},
year = {2023}
}