Design of gradient coils based on the target field method in a high-permeability shield considering sidewall apertures
The combination of high-permeability ferrite and coils is often used to nullify ambient magnetic fields and is widely used in applications such as magnetic resonance imaging and high-sensitivity magnetic sensors. We propose the design method of transverse gradient coils based on the target field met...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-10-01
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| Series: | Results in Physics |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379723008100 |
| _version_ | 1827794350800633856 |
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| author | Kun Wang Danyue Ma Yao Dou Yanan Gao Siran Li Jing Wang Jinji Sun |
| author_facet | Kun Wang Danyue Ma Yao Dou Yanan Gao Siran Li Jing Wang Jinji Sun |
| author_sort | Kun Wang |
| collection | DOAJ |
| description | The combination of high-permeability ferrite and coils is often used to nullify ambient magnetic fields and is widely used in applications such as magnetic resonance imaging and high-sensitivity magnetic sensors. We propose the design method of transverse gradient coils based on the target field method in a high-permeability shield considering sidewall apertures (TFM-HPSCSA), which are installed in the ferrite shield to zero the residual magnetic field gradient. TFM-HPSCSA coils enable an innovative combination of magnetic field gradient linearity and structural luminescence. The coil current density distribution is set to avoid the central sidewall apertures. As a result, the contour distribution of the stream function under the optimized weight coefficients is calculated to obtain the wire alignments of the dBy/dx, dBy/dy and dBy/dz gradient coils. The deviations of the experimentally measured values from the finite element simulations of the three types coils are 0.63%, 1.17% and 0.48%, respectively, which verified the validity and the accuracy of the proposed method. In comparison to the traditional saddle gradient coil designed under the free space condition, the proposed dBy/dx coil produces a 30.5% improvement in the percentage range of regions with 5% magnetic field gradient nonlinearity. The increased linear range of the gradient magnetic field contributes to the improvement of the residual field nulling range in magnetic sensors and magnetic shielding systems in practical applications. |
| first_indexed | 2024-03-11T18:31:27Z |
| format | Article |
| id | doaj.art-ef62717424b74296ab6c79c691e7ad68 |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-03-11T18:31:27Z |
| publishDate | 2023-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj.art-ef62717424b74296ab6c79c691e7ad682023-10-13T11:04:27ZengElsevierResults in Physics2211-37972023-10-0153107017Design of gradient coils based on the target field method in a high-permeability shield considering sidewall aperturesKun Wang0Danyue Ma1Yao Dou2Yanan Gao3Siran Li4Jing Wang5Jinji Sun6Institute of Large-scale Scientific Facility and Centre for Zero Magnetic Field Science, Beihang University, Beijing 100191, ChinaInstitute of Large-scale Scientific Facility and Centre for Zero Magnetic Field Science, Beihang University, Beijing 100191, China; Hefei National Laboratory, Hefei 230088, China; National Institute of Extremely-Weak Magnetic Field Infrastructure, Hangzhou 310000, China; Corresponding authors at: Institute of Large-scale Scientific Facility and Centre for Zero Magnetic Field Science, Beihang University, Beijing 100191, China.Institute of Large-scale Scientific Facility and Centre for Zero Magnetic Field Science, Beihang University, Beijing 100191, ChinaInstitute of Large-scale Scientific Facility and Centre for Zero Magnetic Field Science, Beihang University, Beijing 100191, ChinaChina Academy of Space Technology, Beijing 100094, ChinaBeijing Institute of Electronic System Engineering, Beijing 100074, ChinaInstitute of Large-scale Scientific Facility and Centre for Zero Magnetic Field Science, Beihang University, Beijing 100191, China; Hefei National Laboratory, Hefei 230088, China; National Institute of Extremely-Weak Magnetic Field Infrastructure, Hangzhou 310000, China; Corresponding authors at: Institute of Large-scale Scientific Facility and Centre for Zero Magnetic Field Science, Beihang University, Beijing 100191, China.The combination of high-permeability ferrite and coils is often used to nullify ambient magnetic fields and is widely used in applications such as magnetic resonance imaging and high-sensitivity magnetic sensors. We propose the design method of transverse gradient coils based on the target field method in a high-permeability shield considering sidewall apertures (TFM-HPSCSA), which are installed in the ferrite shield to zero the residual magnetic field gradient. TFM-HPSCSA coils enable an innovative combination of magnetic field gradient linearity and structural luminescence. The coil current density distribution is set to avoid the central sidewall apertures. As a result, the contour distribution of the stream function under the optimized weight coefficients is calculated to obtain the wire alignments of the dBy/dx, dBy/dy and dBy/dz gradient coils. The deviations of the experimentally measured values from the finite element simulations of the three types coils are 0.63%, 1.17% and 0.48%, respectively, which verified the validity and the accuracy of the proposed method. In comparison to the traditional saddle gradient coil designed under the free space condition, the proposed dBy/dx coil produces a 30.5% improvement in the percentage range of regions with 5% magnetic field gradient nonlinearity. The increased linear range of the gradient magnetic field contributes to the improvement of the residual field nulling range in magnetic sensors and magnetic shielding systems in practical applications.http://www.sciencedirect.com/science/article/pii/S2211379723008100Target field methodHigh permeabilityCylindrical coilMagnetic field gradient |
| spellingShingle | Kun Wang Danyue Ma Yao Dou Yanan Gao Siran Li Jing Wang Jinji Sun Design of gradient coils based on the target field method in a high-permeability shield considering sidewall apertures Results in Physics Target field method High permeability Cylindrical coil Magnetic field gradient |
| title | Design of gradient coils based on the target field method in a high-permeability shield considering sidewall apertures |
| title_full | Design of gradient coils based on the target field method in a high-permeability shield considering sidewall apertures |
| title_fullStr | Design of gradient coils based on the target field method in a high-permeability shield considering sidewall apertures |
| title_full_unstemmed | Design of gradient coils based on the target field method in a high-permeability shield considering sidewall apertures |
| title_short | Design of gradient coils based on the target field method in a high-permeability shield considering sidewall apertures |
| title_sort | design of gradient coils based on the target field method in a high permeability shield considering sidewall apertures |
| topic | Target field method High permeability Cylindrical coil Magnetic field gradient |
| url | http://www.sciencedirect.com/science/article/pii/S2211379723008100 |
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