A Miniature Permanent Magnet Assembly with Localized and Uniform Field with an Application to Optical Pumping of Helium
Atomic state preparation can benefit from a compact and uniform magnetic field source. Simulations and experimental measurements have been used to design, build, and test such a source and then apply it to the optical pumping of atomic helium. This source is a 9.5 mm (3/8″) OD × 6.7 mm (1/4″) ID × 9...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-09-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/19/8886 |
| _version_ | 1797516861763485696 |
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| author | Garnet Cameron Jonathan Cuevas Jeffrey Pound David Shiner |
| author_facet | Garnet Cameron Jonathan Cuevas Jeffrey Pound David Shiner |
| author_sort | Garnet Cameron |
| collection | DOAJ |
| description | Atomic state preparation can benefit from a compact and uniform magnetic field source. Simulations and experimental measurements have been used to design, build, and test such a source and then apply it to the optical pumping of atomic helium. This source is a 9.5 mm (3/8″) OD × 6.7 mm (1/4″) ID × 9.5 mm (3/8″) long, NdFeB-N42 assembly of 1.6 mm (1/16″) thick customized annular magnets. It has octupole decay with a residual dipole far field from imperfect dipole cancelations. Fast B-field decay localizes the field, minimizing the need for shielding in applications. It has a greater than 50% clear aperture with a uniform and collimated magnetic field consistent with the prediction of several models. The device is applied to a high precision <sup>3,4</sup>He laser spectroscopy experiment using σ<sup>+</sup> or σ<sup>−</sup> optical pumping currently resulting in a measured 99.3% preparation efficiency and in accordance with a rate equation model. |
| first_indexed | 2024-03-10T07:06:47Z |
| format | Article |
| id | doaj.art-7bf55984d6ea4940b6f0f6615ecffe8a |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T07:06:47Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-7bf55984d6ea4940b6f0f6615ecffe8a2023-11-22T15:44:31ZengMDPI AGApplied Sciences2076-34172021-09-011119888610.3390/app11198886A Miniature Permanent Magnet Assembly with Localized and Uniform Field with an Application to Optical Pumping of HeliumGarnet Cameron0Jonathan Cuevas1Jeffrey Pound2David Shiner3Physics Department, College of Science, University of North Texas, 210 Avenue A, Denton, TX 76203, USAPhysics Department, College of Science, University of North Texas, 210 Avenue A, Denton, TX 76203, USAPhysics Department, College of Science, University of North Texas, 210 Avenue A, Denton, TX 76203, USAPhysics Department, College of Science, University of North Texas, 210 Avenue A, Denton, TX 76203, USAAtomic state preparation can benefit from a compact and uniform magnetic field source. Simulations and experimental measurements have been used to design, build, and test such a source and then apply it to the optical pumping of atomic helium. This source is a 9.5 mm (3/8″) OD × 6.7 mm (1/4″) ID × 9.5 mm (3/8″) long, NdFeB-N42 assembly of 1.6 mm (1/16″) thick customized annular magnets. It has octupole decay with a residual dipole far field from imperfect dipole cancelations. Fast B-field decay localizes the field, minimizing the need for shielding in applications. It has a greater than 50% clear aperture with a uniform and collimated magnetic field consistent with the prediction of several models. The device is applied to a high precision <sup>3,4</sup>He laser spectroscopy experiment using σ<sup>+</sup> or σ<sup>−</sup> optical pumping currently resulting in a measured 99.3% preparation efficiency and in accordance with a rate equation model.https://www.mdpi.com/2076-3417/11/19/8886optical pumpingannular permanent magnetminiature magnetlaser orbital angular momentumcollimated magnetic fieldfringe magnetic field |
| spellingShingle | Garnet Cameron Jonathan Cuevas Jeffrey Pound David Shiner A Miniature Permanent Magnet Assembly with Localized and Uniform Field with an Application to Optical Pumping of Helium Applied Sciences optical pumping annular permanent magnet miniature magnet laser orbital angular momentum collimated magnetic field fringe magnetic field |
| title | A Miniature Permanent Magnet Assembly with Localized and Uniform Field with an Application to Optical Pumping of Helium |
| title_full | A Miniature Permanent Magnet Assembly with Localized and Uniform Field with an Application to Optical Pumping of Helium |
| title_fullStr | A Miniature Permanent Magnet Assembly with Localized and Uniform Field with an Application to Optical Pumping of Helium |
| title_full_unstemmed | A Miniature Permanent Magnet Assembly with Localized and Uniform Field with an Application to Optical Pumping of Helium |
| title_short | A Miniature Permanent Magnet Assembly with Localized and Uniform Field with an Application to Optical Pumping of Helium |
| title_sort | miniature permanent magnet assembly with localized and uniform field with an application to optical pumping of helium |
| topic | optical pumping annular permanent magnet miniature magnet laser orbital angular momentum collimated magnetic field fringe magnetic field |
| url | https://www.mdpi.com/2076-3417/11/19/8886 |
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