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 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. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000566576Publication status
publishedExternal links
Journal / series
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated EquipmentVolume
Pages / Article No.
Publisher
ElsevierSubject
Positron; Accumulator; Antimatter; Antihydrogen; GravitationOrganisational unit
03503 - Rubbia, André / Rubbia, André
08718 - Crivelli, Paolo (Tit.-Prof.)
Funding
173597 - Gravitational Behaviour of Anti-Hydrogen at Rest (GBAR) (SNF)
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