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Efficient injection of an intense positron beam into a dipole magnetic field
- Abstract We have demonstrated efficient injection and trapping of a cold positron beam in a dipole magnetic field configuration. The intense 5 eV positron beam was provided by the NEutron induced POsitron source MUniCh facility at the Heinz Maier-Leibnitz Zentrum, and transported into the confinement region of the dipole field trap generated by a supported, permanent magnet with 0.6 T strength at the pole faces. We achieved transport into the region of field lines that do not intersect the outer wall using the drift of the positron beam between a pair of tailored plates that created the electric field. We present evidence that up to 38% of the beam particles are able to reach the intended confinement region and make at least a 180° rotation around the magnet where they annihilate on an insertable target. When the target is removed and the plate voltages are switched off, confinement of a small population persists for on the order of 1 ms. These results lend optimism to our larger aims to apply a magnetic dipole field configuration for trapping of both positrons and electrons in order to test predictions of the unique properties of a pair plasma.
Author: | H Saitoh, J Stanja, E V Stenson, U Hergenhahn, H Niemann, T Sunn Pedersen, M R Stoneking, C Piochacz, C Hugenschmidt |
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URN: | urn:nbn:de:gbv:9-opus-59577 |
DOI: | https://doi.org/10.1088/1367-2630/17/10/103038 |
ISSN: | 1367-2630 |
Parent Title (English): | New Journal of Physics |
Publisher: | IOP Publishing |
Place of publication: | Bristol |
Document Type: | Article |
Language: | English |
Date of first Publication: | 2015/10/19 |
Release Date: | 2022/11/28 |
Tag: | antimatter plasma; dipole magnetic field; electron–positron plasma; pair plasma; positron beam |
GND Keyword: | - |
Volume: | 17 |
Article Number: | 103038 |
Page Number: | 9 |
Faculties: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik |
Licence (German): | Creative Commons - Namensnennung |