Magnetic field considerations for a multi-cell Penning-Malmberg trap for positrons
Abstract
Multi-cell positron traps have been proposed to accumulate and store large numbers of positrons (e.g. ≥ 1010). 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.
- Publication:
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Journal of Plasma Physics
- Pub Date:
- September 2023
- DOI:
- Bibcode:
- 2023JPlPh..89d9305W
- Keywords:
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- plasma confinement;
- intense particle beams