Abstract
Abstract
A study of positron capture in a two-(pressure) stage buffer gas accumulation apparatus is presented for a variety of species, including some molecules which are known to be either efficient for positron trapping, or are frequently used to cool the particles when held in these devices. Absolute accumulation efficiencies are reported for all species. A detailed optimisation procedure, which has identified the main processes responsible for positron capture and loss in the trap, has been deployed to explore accumulation efficiency as the gas pressure and the electrostatic well depth in the trap are systematically varied. Accumulation exploiting energy loss via molecular vibrational transitions has been observed for the first time for a number of gases, though at much lower efficiency than achieved using electronic excitation processes.
Funder
Engineering and Physical Sciences Research Council
Subject
Condensed Matter Physics,Atomic and Molecular Physics, and Optics
Cited by
3 articles.
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1. A buffer-gas trap for the NEPOMUC positron beam: optimization studies with electrons;Journal of Plasma Physics;2023-12
2. Positron accumulation in the GBAR experiment;Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment;2022-10
3. Tribological Behaviors Analysis of Synthesized Chromel Composite;Materials Research;2022