Positron beams & diagnostics

The NEutron-induced POsitron source MUniCh (NEPOMUC), installed at the FRM II at the Heinz-Maier-Leibnitz Zentrum (MLZ), is one of the most intense antimatter sources in the world, capable of producing more than a billion low-energy (< 1 keV) anti-electrons (i.e., positrons) every second.   These can be used for a wide variety of surface science, materials science, solid state physics, and atomic physics applications.  More details can be found on the NEPOMUC website.

Within the scope of the APEX collaboration, we have conducted a number of studies to order to develop new settings for the NEPOMUC beam, so as to optimize for high rates of positrons with phase space distributions suitable to be injected into the traps we are building.  We also develop diagnostic techniques for positrons, non-neutral plasmas, and pair plasmas --- all of which require significantly different methods than are typically used for quasi-neutral, electron-ion plasmas.

Selected publications:

1.
Horn-Stanja, J.; Stenson, E.; Stoneking, M. R.; Singer, M.; Hergenhahn, U.; Nißl, S.; Saitoh, H.; Pedersen, T. S.; Dickmann, M.; Hugenschmidt, C. et al.; Danielson, J. R.: Injection of intense low-energy reactor-based positron beams into a supported magnetic dipole trap. Plasma Research Express (PREX) 2, 015006 (2020)
2.
Stenson, E. V.; Hergenhahn, U.; Stoneking, M. R.; Pedersen, T. S.: Positron-Induced Luminescence. Physical Review Letters 120, 147401 (2018)
3.
Stanja, J.; Hergenhahn, U.; Niemann, H.; Paschkowski, N.; Pedersen, T. S.; Saitoh, H.; Stenson, E. V.; Stoneking, M. R.; Hugenschmidt, C.; Piochacz, C.: Characterization of the NEPOMUC primary and remoderated positron beams at different energies. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 827, pp. 52 - 62 (2016)
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