Bremen 2017 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 13: Magnetic Confinement

P 13.5: Poster

Dienstag, 14. März 2017, 16:30–18:30, HS Foyer

Development status of a levitated dipole experiment for pair-plasma production — •Haruhiko Saitoh1, Juliane Horn-Stanja1, Eve V. Stenson1, Uwe Hergenhahn1, Thomas Sunn Pedersen1, Markus Singer2, Matthew R. Stoneking3, and Nagato Yanagi41Max-Planck-Institut für Plasmaphysik — 2Technische Universität München — 3Lawrence University, USA — 4National Institute for Fusion Science, Japan

Magnetic dipole is a simple and most common field configuration in the Universe, which generates a variety of plasma phenomena in a strongly inhomogeneous magnetic field. One of scientific applications of the dipole field is its usage as a trapping geometry for electron-positron pair-plasmas. For this purpose, we, the APEX (A Positron Electron Experiment) collaboration [1], is developing a compact levitated dipole device, APEX-D, to be operated at the NEPOMUC slow positron facility [2]. In order to minimize perturbations to plasmas, the superconducting dipole field coil (F coil, "F" for floating) of APEX-D will be magnetically levitated in a vacuum chamber. We plan to fabricate a Bi-2223 high-temperature superconducting (HTS) F coil that is magnetically levitated by using a feedback-controlled levitation coil (L coil), after inductive excitation of a persistent current in the F coil. We report design studies and status of development on the APEX-D project.

[1] T. Sunn Pedersen et al., New J. Physics 14, 035010 (2012).

[2] C. Hugenschmidt et al., New J. Physics 14, 055027 (2012).

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