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Magnetic field considerations for a multi-cell Penning–Malmberg trap for positrons

Part of: Non-neutral plasmas: achievements and perspectives

Published online by Cambridge University Press:  14 September 2023

D.R. Witteman Open the ORCID record for D.R. Witteman [Opens in a new window] ,
M. Singer Open the ORCID record for M. Singer [Opens in a new window] ,
J.R. Danielson Open the ORCID record for J.R. Danielson [Opens in a new window]  and
C.M. Surko Open the ORCID record for C.M. Surko [Opens in a new window]
D.R. Witteman
Affiliation:
Department of Physics, University of California San Diego, San Diego, CA 92093, USA
M. Singer
Affiliation:
Max-Planck Institute for Plasma Physics, 17491 Greifswald, Germany Institute for Physics, University of Greifswald, 17489 Greifswald, Germany
J.R. Danielson
Affiliation:
Department of Physics, University of California San Diego, San Diego, CA 92093, USA
C.M. Surko*
Affiliation:
Department of Physics, University of California San Diego, San Diego, CA 92093, USA
*
†Email address for correspondence: csurko@ucsd.edu
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Abstract

Multi-cell positron traps have been proposed to accumulate and store large numbers of positrons (e.g. ${\ge }10^{10}$). This design arranges lines of Penning–Malmberg traps (‘cells’) on and off the magnetic axis in a vacuum chamber in a common, uniform magnetic field. Confinement considerations impose additional constraints on the magnetic field beyond the usual on-axis homogeneity requirements. These requirements are discussed. A prototype magnetic field and associated coil geometry is suggested to achieve good single-component plasma confinement in all cells. Experimental confinement data as a function of electrode alignment with respect to a nominally uniform magnetic field are also presented. These results are related to the field-alignment considerations of the magnet design study.

Keywords

plasma confinementintense particle beams
Type
Research Article
Information
Journal of Plasma Physics , Volume 89 , Issue 4 , August 2023 , 935890405
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Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press

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