A new scheme to accumulate positrons in a Penning-Malmberg trap with a linac-based positron pulsed source

The Gravitational Behaviour of Antimatter at Rest experiment (GBAR) is designed to perform a direct measurement of the weak equivalence principle on antimatter by measuring the acceleration of anti-hydrogen atoms in the gravitational field of the Earth. The experimental scheme requires a high densit...

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Bibliographic Details
Main Author: Dupre, P.
Format: Conference Proceeding
Language:English
Subjects:
ACCELERATION
ANTIPROTONS
ATOMIC AND MOLECULAR PHYSICS
CERN
COMPUTERIZED SIMULATION
DENSITY
ELECTRONS
EQUIVALENCE PRINCIPLE
GRAVITATIONAL FIELDS
HADRONIC ATOMS
HYDROGEN
LINEAR ACCELERATORS
MODERATORS
NEON
PARTICLE ACCELERATORS
POSITRON SOURCES
POSITRONIUM
POSITRONS
SODIUM 22
TRAPPING
TRAPS
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Summary:The Gravitational Behaviour of Antimatter at Rest experiment (GBAR) is designed to perform a direct measurement of the weak equivalence principle on antimatter by measuring the acceleration of anti-hydrogen atoms in the gravitational field of the Earth. The experimental scheme requires a high density positronium (Ps) cloud as a target for antiprotons, provided by the Antiproton Decelerator (AD) - Extra Low Energy Antiproton Ring (ELENA) facility at CERN. The Ps target will be produced by a pulse of few 10{sup 10} positrons injected onto a positron-positronium converter. For this purpose, a slow positron source using an electron Linac has been constructed at Saclay. The present flux is comparable with that of {sup 22}Na-based sources using solid neon moderator. A new positron accumulation scheme with a Penning-Malmberg trap has been proposed taking advantage of the pulsed time structure of the beam. In the trap, the positrons are cooled by interaction with a dense electron plasma. The overall trapping efficiency has been estimated to be {approx}70% by numerical simulations.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4796067