We report the manipulation of positron orbits in a toroidal dipole magnetic field configuration realized with electric fields generated by segmented electrodes. When the toroidal circulation motion of positrons in the dipole field is coupled with time-varying electric fields generated by azimuthally segmented outer electrodes, positrons undergo oscillations of their radial positions. This enables quick manipulation of the spatial profiles of positrons in a dipole field trap by choosing appropriate frequency, amplitude, phase, and gating time of the electric fields. According to numerical orbit analysis, we applied these electric fields to positrons injected from the NEPOMUC slow positron facility into a prototype dipole field trap experiment with a permanent magnet. Measurements with annihilation γ-rays clearly demonstrated the efficient compression effects of positrons into the strong magnetic field region of the dipole field configuration. This positron manipulation technique can be used as one of essential tools for future experiments on the formation of electron-positron plasmas.
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23 January 2018
NON-NEUTRAL PLASMA PHYSICS X: 12th International Workshop on Non-Neutral Plasmas
10–13 July 2017
Appleton, Wisconsin, USA
Research Article|
January 23 2018
Manipulation of positron orbits in a dipole magnetic field with fluctuating electric fields
H. Saitoh;
H. Saitoh
1
Max Planck Institute for Plasma Physics, Greifswald and Garching
, Germany
5
The University of Tokyo
, Kashiwa, Japan
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J. Horn-Stanja;
J. Horn-Stanja
1
Max Planck Institute for Plasma Physics, Greifswald and Garching
, Germany
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S. Nißl;
S. Nißl
1
Max Planck Institute for Plasma Physics, Greifswald and Garching
, Germany
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E. V. Stenson;
E. V. Stenson
1
Max Planck Institute for Plasma Physics, Greifswald and Garching
, Germany
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U. Hergenhahn;
U. Hergenhahn
1
Max Planck Institute for Plasma Physics, Greifswald and Garching
, Germany
6
Leibniz Institute of Surface Modification
, Leipzig, Germany
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T. Sunn Pedersen;
T. Sunn Pedersen
1
Max Planck Institute for Plasma Physics, Greifswald and Garching
, Germany
7
Ernst Moritz Arndt Universität
, Greifswald, Germany
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M. Singer;
M. Singer
2
Technische Universität München
, Garching, Germany
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M. Dickmann;
M. Dickmann
2
Technische Universität München
, Garching, Germany
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C. Hugenschmidt;
C. Hugenschmidt
2
Technische Universität München
, Garching, Germany
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M. R. Stoneking;
M. R. Stoneking
3
Department of Physics, Lawrence University
, Appleton, USA
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J. R. Danielson;
J. R. Danielson
4
University of California
, San Diego, USA
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C. M. Surko
C. M. Surko
4
University of California
, San Diego, USA
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AIP Conf. Proc. 1928, 020013 (2018)
Citation
H. Saitoh, J. Horn-Stanja, S. Nißl, E. V. Stenson, U. Hergenhahn, T. Sunn Pedersen, M. Singer, M. Dickmann, C. Hugenschmidt, M. R. Stoneking, J. R. Danielson, C. M. Surko; Manipulation of positron orbits in a dipole magnetic field with fluctuating electric fields. AIP Conf. Proc. 23 January 2018; 1928 (1): 020013. https://doi.org/10.1063/1.5021578
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