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  • Letter
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Injection and confinement of positron bunches in a magnetic dipole trap

A. Deller1,2,*, J. von der Linden1,†, S. Nißl1, K. Michishio3, N. Oshima3, H. Higaki4, and E. V. Stenson1

  • *Contact author: adam.deller@ipp.mpg.de
  • †Contact author: jens.von.der.linden@ipp.mpg.de
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Phys. Rev. E 110, L023201 – Published 9 August, 2024

DOI: https://doi.org/10.1103/PhysRevE.110.L023201

Abstract

We demonstrate the efficient injection of a pulsed positron beam into a magnetic dipole trap and investigate the ensuing particle dynamics in the inhomogeneous electric and magnetic fields. Bunches of ∼105e+ were transferred from a buffer-gas trap into the field of a permanent magnet using a lossless E×B drift technique. The Δt≈0.2µs pulses were short compared to the toroidal rotation period, τd≈16µs, and e+ confinement time, τc≈0.6 s. The redistribution dynamics were studied by measuring the delayed γ-ray emission as the trap was emptied. This work extends the record for the number of low-energy positrons held in a dipole trap by two orders of magnitude and represents a significant advance toward the confinement of an electron-positron pair plasma.

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Phys. Rev. E 110, L023201– Published 9 August, 2024
  • Received 25 April 2024
  • Accepted 3 July 2024
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