Non-neutral plasma manipulation techniques in development of a high-capacity positron trap

Journal Article · Wed Dec 01 00:00:00 EST 2021 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0067666· OSTI ID:1833731

Singer, M.  ^[1]; König, S.  ^[2]; Stoneking, M. R.  ^[3]; Steinbrunner, P. ^[4]; Danielson, J. R.  ^[5]; Schweikhard, L. ^[2]; Pedersen, T. Sunn  ^[1]

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1. Max-Planck Institute for Plasma Physics, 17491 Greifswald, Germany, University of Greifswald, 17489 Greifswald, Germany
2. University of Greifswald, 17489 Greifswald, Germany
3. Max-Planck Institute for Plasma Physics, 85748 Garching, Germany, Lawrence University, Appleton, Wisconsin 54911, USA
4. Max-Planck Institute for Plasma Physics, 17491 Greifswald, Germany
5. University of California, San Diego, La Jolla, California 92093, USA

Preliminary experiments have been performed toward the development of a multi-cell Penning–Malmberg trap for the storage of large numbers of positrons (≥10 ¹⁰ e ⁺ ). We introduce the master-cell test trap and the diagnostic tools for first experiments with electrons. The usage of a phosphor screen to measure the z-integrated plasma distribution and the number of confined particles is demonstrated, as well as the trap alignment to the magnetic field ( B = 3.1 T) using the m = 1 diocotron mode. The plasma parameters and expansion are described along with the autoresonant excitation of the diocotron mode using rotating dipole fields and frequency chirped sinusoidal drive signals. We analyze the reproducibility of the excitation and use these findings to settle on the path for the next generation multi-cell test device.

• Sponsoring Organization: USDOE
• Grant/Contract Number: SC0019271
• OSTI ID: 1833731
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Vol. 92 Journal Issue: 12; ISSN 0034-6748
• Publisher: American Institute of Physics
• Country of Publication: United States
• Language: English