Development of a permanent magnet alternative for a solenoidal ion source

The most sensitive desktop-sized ionizer utilising electron bombardment is currently the solenoidal ion source. We present an alternate design for such an ion source whereby the solenoidal windings of the electromagnet are replaced by a shaped cylindrical permanent magnet in order to reduce the comp...

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Veröffentlicht in:Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2014-12, Vol.340, p.85-89
Hauptverfasser: Martens, J., Fahy, A., Barr, M., Jardine, A., Allison, W., Dastoor, P.C.
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container_title Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms
container_volume 340
creator Martens, J.
Fahy, A.
Barr, M.
Jardine, A.
Allison, W.
Dastoor, P.C.
description The most sensitive desktop-sized ionizer utilising electron bombardment is currently the solenoidal ion source. We present an alternate design for such an ion source whereby the solenoidal windings of the electromagnet are replaced by a shaped cylindrical permanent magnet in order to reduce the complexity and running costs of the instrument. Through finite element modelling of the magnetic field in COMSOL and experimental measurements on a small-scale prototype magnet stack, we demonstrate the required shape of the permanent magnet in order to generate the needed field, and the necessity of soft iron collars to smooth fluctuations along the central axis.
doi_str_mv 10.1016/j.nimb.2014.07.033
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source ScienceDirect Journals (5 years ago - present)
subjects Beam interactions
Collars
Electron bombardment
Electron impact ionizer
Ion sources
Iron
Magnetic fields
Mathematical analysis
Modelling
Neutral species detection
Permanent magnet
Permanent magnets
title Development of a permanent magnet alternative for a solenoidal ion source
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