Abstract
An increased low-energy positron flux is obtained from the reactor based NEPOMUC source when using its primary beam at energies as low as 20 eV. First experiments with this beam in a supported magnetic dipole trap resulted in the maximum current of injected positrons to date. According to single-particle simulations, remaining limitations in the injection efficiency, observed in the experiment, can be attributed to the spatial spread of the beam. In the first trapping measurements with this beam, top-down asymmetries in the electrostatic trapping potential are found to be detrimental to confinement.
Highlights
The APEX (A Positron Electron eXperiment) project aims for the first creation of a magnetically confined electron-positron pair plasma in the laboratory [1]
To increase this would require a stronger source or, for example, stacking of multiple bunches into the trap. The latter has been successfully demonstrated for linear traps [11, 12], its implementation for a magnetic dipole trap using a reactor-based source is not straightforward. We focus on the former using an obvious candidate for a stronger source: the lower-brightness but higher-flux Neutron-induced positron source Munich (NEPOMUC) primary beam which is usually extracted with an energy of one thousand electron-volts
At NEPOMUC, the primary positron beam has been extracted from the source section with kinetic energies comparable to those used in previous experiments with the remoderated beam, i.e. 5 and 20 eV, for the first time
Summary
An increased low-energy positron flux is obtained from the reactor based NEPOMUC source when using its primary beam at energies as low as 20 eV. First experiments with this beam in a supported magnetic dipole trap resulted in the maximum current of injected positrons to date. According to single-particle simulations, remaining limitations in the injection efficiency, observed in the experiment, can be attributed to the spatial spread of the beam. In the first trapping measurements with this beam, top-down asymmetries in the electrostatic trapping potential are found to be detrimental to confinement
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