Design and test of a 700 mm long hexapole composed of rectangular rare earth cobalt permanent magnets

Bechtold, V.; Friedrich, L.; Baran, W.; Ervens, W.; Kessler, S.

doi:10.1109/tmag.1981.1061379

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…Applications of permanent magnet systems made from these materials include beam focussing in particle accelerators [3, 41, ECR discharges used as ion source [5,61, and modifications of the properties of glow discharges [7,8,9,10,111. We use Nd,Fe,,B magnets to modify the operating conditions of our hollow cathode and Penning discharges [8,111.…”

Section: Introductionmentioning

confidence: 99%

Field Calculations for Permanent Magnets used for Glow Discharges

Heise

Kock

1995

Contrib. Plasma Phys.

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If a permanent magnet has both a homogeneous polarization inside the material and a linear demagnetization characteristic in external fields, its magnetic field can be expressed using a surface pole model. For magnets satisfying these conditions and, in addition, having a rectangular shape, the fields at any given-point in space can be calculated analytically. An algorithm for this calculation is presented in a form that can easily be implemented into a computer program. In our experiments we used Nd,Fe,,B magnets to support low pressure glow discharges by magnetic fields. The magnets can be seen as composed of elementary magnets with rectangular shape, for which the magnetic field distribution is calculable. We present results of field calculations for various configurations of permanent magnets that we used in hollow cathode and Penning discharges.

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Section: Introductionmentioning

confidence: 99%

Field Calculations for Permanent Magnets used for Glow Discharges

Heise

Kock

1995

Contrib. Plasma Phys.

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Hexapole magnet system for thermal energy He3 atom manipulation

Jardine

Fouquet

Ellis

et al. 2001

Review of Scientific Instruments

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We present design and construction details for a novel high field, small bore permanent hexapole magnet. The design is intended for focusing atomic beams of He3 at thermal energies. The magnet uses an optimized polepiece design which includes vacuum gaps to enable its use with high intensity atomic and molecular beams. The 0.3 m long, 1 mm internal radius magnet achieves a polepiece tip field of 1.1 T using NdFeB permanent magnets and Permendur 49 polepieces. The polepiece shanks are designed to saturate so that the hexapole properties are determined predominantly by the shape of the polepiece tip. The performance of the hexapole assembly is demonstrated with an 8 meV He3 beam in the beam source of the Cambridge spin echo spectrometer and the measured focused beam results show excellent agreement with theoretical predictions and negligible beam attenuation.

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Design and test of a 700 mm long hexapole composed of rectangular rare earth cobalt permanent magnets

Cited by 2 publications

References 4 publications

Field Calculations for Permanent Magnets used for Glow Discharges

Field Calculations for Permanent Magnets used for Glow Discharges

Hexapole magnet system for thermal energy He3 atom manipulation

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