Injection and confinement of positron bunches in a magnetic dipole trap
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 ∼10^{5}e^{+} 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, τ_{d}≈16µs, and e^{+} confinement time, τ_{c}≈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.
Authors
- H. Higaki (ORCID: https://orcid.org/0000-0002-9989-3229)
- Jens von der Linden (ORCID: https://orcid.org/0000-0003-2747-7813)
- Nagayasu Oshima (ORCID: https://orcid.org/0000-0002-5713-112X)
- S. Nißl (ORCID: https://orcid.org/0000-0002-1176-3906)
- A. Deller (ORCID: https://orcid.org/0000-0002-3430-1501)
- E. V. Stenson (ORCID: https://orcid.org/0000-0003-1868-1513)
- Koji Michishio (ORCID: https://orcid.org/0000-0003-1381-7856)
Institutions
- Hiroshima University (JP)
- University of California San Diego (US)
- Max Planck Institute for Plasma Physics (DE)
- National Institute of Advanced Industrial Science and Technology (JP)
Publication Details
- Journal
- Physical review. E
- Published
- 2024-08-09
- DOI
- https://doi.org/10.1103/physreve.110.l023201
- Citations
- 5
- Primary Topic
- Particle accelerators and beam dynamics
- Type
- article
- Field-Weighted Citation Impact
- 6.49
Funders
- Alexander von Humboldt-Stiftung
- UC San Diego Foundation
- Deutsche Forschungsgemeinschaft
- Helmholtz Association
- University of California, San Diego
- European Research Council
- Japan Society for the Promotion of Science