Positron accumulation in the GBAR experiment

P. Blumer, M. Charlton,M. Chung, P. Clade, P. Comini,P. Crivelli,O. Dalkarov,P. Debu,L. Dodd,A. Douillet, S. Guellati,P. -A Hervieux, L. Hilico,P. Indelicato,G. Janka,S. Jonsell,J. -P. Karr,B. H. Kim,E. S. Kim,S. K. Kim,Y. Ko,T. Kosinski,N. Kuroda, B. M. Latacz,B. Lee, H. Lee,J. Lee, A. M. M. Leitee, K. Leveque,E. Lim,L. Liszkay, P. Lotrus,D. Lunney,G. Manfredi, B. Mansoulie,M. Matusiak, G. Mornacchi, V. Nesvizhevsky, F. Nez, S. Niang, R. Nishi,B. Ohayon,K. Park,N. Paul, P. Perez,S. Procureur,B. Radics, C. Regenfus,J. -M. Reymond,S. Reynaud,J. -Y. Rousse,O. Rousselle, A. Rubbia, J. Rzadkiewicl, Y. Sacquin,F. Schmidt-Kaler,M. Staszczak, K. Szymczyk, T. Tanaka, B. Tuchming, B. Vallage, A. Voronin,D. P. van der Werf,S. Wolf,D. Won,S. Wronka,Y. Yamazaki,K. H. Yoo,P. Yzombard, C. J. Baker

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment（2022）

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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 1010 positrons, efficiently converted into positronium (Ps), together with about 107 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) × 109 positrons in 1100 s.

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关键词

Positron,Accumulator,Antimatter,Antihydrogen,Gravitation

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