Bidirectional, Analog Current Source Benchmarked with Gray Molasses-Assisted Stray Magnetic Field Compensation
In ultracold-atom and ion experiments, flexible control of the direction and amplitude of a uniform magnetic field is necessary. It is achieved almost exclusively by controlling the current flowing through coils surrounding the experimental chamber. Here, we present the design and characterization o...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-11-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/21/10474 |
| _version_ | 1797512736641384448 |
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| author | Jakub Dobosz Mateusz Bocheński Mariusz Semczuk |
| author_facet | Jakub Dobosz Mateusz Bocheński Mariusz Semczuk |
| author_sort | Jakub Dobosz |
| collection | DOAJ |
| description | In ultracold-atom and ion experiments, flexible control of the direction and amplitude of a uniform magnetic field is necessary. It is achieved almost exclusively by controlling the current flowing through coils surrounding the experimental chamber. Here, we present the design and characterization of a modular, analog electronic circuit that enables three-dimensional control of a magnetic field via the amplitude and direction of a current flowing through three perpendicular pairs of coils. Each pair is controlled by one module, and we are able to continuously change the current flowing thorough the coils in the ±4 A range using analog waveforms such that smooth crossing through zero as the current’s direction changes is possible. With the electrical current stability at the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>10</mn><mrow><mo>−</mo><mn>5</mn></mrow></msup></semantics></math></inline-formula> level, the designed circuit enables state-of-the-art ultracold experiments. As a benchmark, we use the circuit to compensate stray magnetic fields that hinder efficient sub-Doppler cooling of alkali atoms in gray molasses. We demonstrate how such compensation can be achieved without actually measuring the stray fields present, thus speeding up the process of optimization of various laser cooling stages. |
| first_indexed | 2024-03-10T06:05:54Z |
| format | Article |
| id | doaj.art-c5c0a0ae66984bf2bcbfaa82c6692e16 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T06:05:54Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-c5c0a0ae66984bf2bcbfaa82c6692e162023-11-22T20:32:43ZengMDPI AGApplied Sciences2076-34172021-11-0111211047410.3390/app112110474Bidirectional, Analog Current Source Benchmarked with Gray Molasses-Assisted Stray Magnetic Field CompensationJakub Dobosz0Mateusz Bocheński1Mariusz Semczuk2Institute of Experimental Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, PolandInstitute of Experimental Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, PolandInstitute of Experimental Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, PolandIn ultracold-atom and ion experiments, flexible control of the direction and amplitude of a uniform magnetic field is necessary. It is achieved almost exclusively by controlling the current flowing through coils surrounding the experimental chamber. Here, we present the design and characterization of a modular, analog electronic circuit that enables three-dimensional control of a magnetic field via the amplitude and direction of a current flowing through three perpendicular pairs of coils. Each pair is controlled by one module, and we are able to continuously change the current flowing thorough the coils in the ±4 A range using analog waveforms such that smooth crossing through zero as the current’s direction changes is possible. With the electrical current stability at the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>10</mn><mrow><mo>−</mo><mn>5</mn></mrow></msup></semantics></math></inline-formula> level, the designed circuit enables state-of-the-art ultracold experiments. As a benchmark, we use the circuit to compensate stray magnetic fields that hinder efficient sub-Doppler cooling of alkali atoms in gray molasses. We demonstrate how such compensation can be achieved without actually measuring the stray fields present, thus speeding up the process of optimization of various laser cooling stages.https://www.mdpi.com/2076-3417/11/21/10474stray magnetic fieldscompensation coilssub-Doppler coolingbipolar current sourcebidirectional current source |
| spellingShingle | Jakub Dobosz Mateusz Bocheński Mariusz Semczuk Bidirectional, Analog Current Source Benchmarked with Gray Molasses-Assisted Stray Magnetic Field Compensation Applied Sciences stray magnetic fields compensation coils sub-Doppler cooling bipolar current source bidirectional current source |
| title | Bidirectional, Analog Current Source Benchmarked with Gray Molasses-Assisted Stray Magnetic Field Compensation |
| title_full | Bidirectional, Analog Current Source Benchmarked with Gray Molasses-Assisted Stray Magnetic Field Compensation |
| title_fullStr | Bidirectional, Analog Current Source Benchmarked with Gray Molasses-Assisted Stray Magnetic Field Compensation |
| title_full_unstemmed | Bidirectional, Analog Current Source Benchmarked with Gray Molasses-Assisted Stray Magnetic Field Compensation |
| title_short | Bidirectional, Analog Current Source Benchmarked with Gray Molasses-Assisted Stray Magnetic Field Compensation |
| title_sort | bidirectional analog current source benchmarked with gray molasses assisted stray magnetic field compensation |
| topic | stray magnetic fields compensation coils sub-Doppler cooling bipolar current source bidirectional current source |
| url | https://www.mdpi.com/2076-3417/11/21/10474 |
| work_keys_str_mv | AT jakubdobosz bidirectionalanalogcurrentsourcebenchmarkedwithgraymolassesassistedstraymagneticfieldcompensation AT mateuszbochenski bidirectionalanalogcurrentsourcebenchmarkedwithgraymolassesassistedstraymagneticfieldcompensation AT mariuszsemczuk bidirectionalanalogcurrentsourcebenchmarkedwithgraymolassesassistedstraymagneticfieldcompensation |