10-11 December 2019
Marriott
Europe/Berlin timezone

Addition of a buffer-gas trap system to the NEPOMUC positron beam line

10 Dec 2019, 17:15
25m
Marriott Conference room - Munich (Marriott)

Marriott Conference room - Munich

Marriott

Berliner Str. 93 80805 München Germany
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Invited talk Positrons Positrons

Speaker

Dr E. V. Stenson (Technische Universität München, University of California San Diego, Max Planck Institut für Plasmaphysik)

Description

The buffer-gas trap (BGT) is a well-established method for accumulating a steady-state stream of positrons into dense, cool, single-component clouds/plasmas, which can in turn be used to generate pulses or beams tailored to the application at hand [1]. BGTs are regularly employed in the creation of anti-atoms, the generation of positronium, studies of atomic and molecular interactions with antimatter, and a variety of surface and materials science techniques, just to name a few examples.

The e+ beams most commonly accumulated in BGTs come from Ne-moderated Na-22 and have a flux of <$10^7$ e+/s; this results in an upper limit on how many positrons can be accumulated and a lower limit on the time required to do so. The NEutron-induced POsitron source MUniCh (NEPOMUC) at FRM-II can deliver significantly more positron flux, up to 10$^9$ e+/s [2]. Preparations are underway to outfit NEPOMUC with a BGT system, after which an experimental program will determine the optimal combination of beam settings and trap settings for maximizing positrons/pulse. This will be a key step toward trapping enough positrons to create a magnetically confined plasma of half matter and half antimatter (a compelling frontier in plasma physics research and the goal of the APEX Collaboration) [3].

[1] J. R. Danielson, et al. Rev. Mod. Phys. 87, 247 (2015).
[2] C. Hugenschmidt, et al. New J. Phys. 14, 055027 (2012).
[3] T. Sunn Pedersen, et al. New J. Phys. 14, 035010 (2012).

Primary authors

Dr E. V. Stenson (Technische Universität München, University of California San Diego, Max Planck Institut für Plasmaphysik) Dr J. R. Danielson (University of California San Diego) Prof. C. M. Surko (University of California San Diego) C. L. Manson (University of California San Diego) Dr S. Ghosh (University of California San Diego) Dr M. Dickmann (Universität der Bundeswehr München) Dr F. Guatieri (Technische Universität München) Prof. C. Hugenschmidt (Technische Universität München) S. Nißl (Max Planck Institute für Plasmaphysik, Technische Universität München) Dr A. Deller (Max Planck Institute für Plasmaphysik) Prof. T. Sunn Pedersen (Max Planck Institut für Plasmaphysik, Universität Greifswald) the APEX Collaboration

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