Phase space of positron trajectories exiting a charged particle source through a magnetic field point cusp

A configuration of magnetic fields using properties of cylindrically symmetric permanent magnets is presented as a candidate to produce a high purity charged particle source or trap. Cylindrically symmetric hollow permanent magnets produce magnetic field point cusps on the axis of symmetry. A magnet...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2014-08, Vol.332, p.401-403
Main Authors: Kiester, A.S., Pacheco, J.L., Ordonez, C.A., Weathers, D.L.
Format: Article
Language:English
Subjects:
Charged particles
Classical trajectory Monte Carlo simulation
Cusps
Ion source
Ion sources
Kinetic energy
Magnetic fields
Permanent magnets
Plasma trap
Point cusp
Positrons
Trajectories
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Summary:A configuration of magnetic fields using properties of cylindrically symmetric permanent magnets is presented as a candidate to produce a high purity charged particle source or trap. Cylindrically symmetric hollow permanent magnets produce magnetic field point cusps on the axis of symmetry. A magnetic field point cusp reflects all particles that lie outside a narrow region of phase space, a region dependent on particle kinetic energies and on the magnetic field intensity. An analysis of the phase space of positron trajectories entering and exiting a magnetic field point cusp is presented and quantified with respect to magnetic field intensity and particle kinetic energy. Preliminary experimental results support the use of point cusps for ion source applications.
ISSN:0168-583X
1872-9584
DOI:10.1016/j.nimb.2014.02.106