Hannover 2020 – scientific programme
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P: Fachverband Plasmaphysik
P 16: Poster Session 3
P 16.5: Poster
Wednesday, March 11, 2020, 16:30–18:30, Empore Lichthof
Developments towards an electron-positron plasma in a magnetic dipole trap — •J. Horn-Stanja1, A. Deller1, U. Hergenhahn1, S. Nißl1, E. V. Stenson1, M. R. Stoneking1, T. Sunn Pedersen1, H. Saitoh2, C. Hugenschmidt3, M. Singer3, J. R. Danielson4, and C. M. Surko4 — 1Max Planck Institute for Plasma Physics, Germany — 2The University of Tokyo, Japan — 3Technische Universität München, Germany — 4University of California San Diego, USA
The electron-positron many-body system in the plasma state is distinguished by the mass equality of the constituents, leading to stability and wave-physics properties fundamentally different from those of conventional plasmas. The creation of such “pair plasma” in the magnetic field of a levitated dipole is the goal of the APEX/PAX collaboration.
Although lossless injection and second-long trapping of positrons has been demonstrated in experiments with a supported dipole at the first-class positron source NEPOMUC, the number of available positrons remains a key challenge. While a small positron Debye length in the pair plasma eventually requires the use of a multicell storage trap, current single-particle experiments will benefit from the recent development of the intense NEPOMUC primary beam at lower energies or the upcoming installation of a buffer gas trap at NEPOMUC which will provide dense positron pulses. First experiments using electrons and positrons simultaneously in a dipole trap are one such example.
In this contribution, we discuss recent and upcoming developments within the scope of the APEX project.