التفاصيل البيبلوغرافية
| العنوان: |
Magnetic field design in a cylindrical high-permeability shield: The combination of simple building blocks and a genetic algorithm. |
| المؤلفون: |
Packer, M., Hobson, P. J., Davis, A., Holmes, N., Leggett, J., Glover, P., Hardwicke, N. L., Brookes, M. J., Bowtell, R., Fromhold, T. M. |
| المصدر: |
Journal of Applied Physics; 3/7/2022, Vol. 131 Issue 9, p1-22, 22p |
| مصطلحات موضوعية: |
MAGNETIC fields, GREEN'S functions, MAGNETIC shielding, GENETIC algorithms, MAGNETIC control |
| مستخلص: |
Magnetically sensitive experiments and newly developed quantum technologies with integrated high-permeability magnetic shields require increasing control of their magnetic field environment and reductions in size, weight, power, and cost. However, magnetic fields generated by active components are distorted by high-permeability magnetic shielding, particularly when they are close to the shield's surface. Here, we present an efficient design methodology for creating desired static magnetic field profiles by using discrete coils electromagnetically coupled to a cylindrical passive magnetic shield. We utilize a modified Green's function solution that accounts for the interior boundary conditions on a closed finite-length high-permeability cylindrical magnetic shield and determine simplified expressions when a cylindrical coil approaches the interior surface of the shield. We use an analytic formulation of simple discrete building blocks to provide a complete discrete coil basis to generate any physically attainable magnetic field inside the shield. We then use a genetic algorithm to find optimized discrete coil structures composed of this basis. We use our methodology to generate an improved linear axial gradient field, d B z / d z , and a transverse bias field, B x. These optimized structures generate the desired fields with less than 1 % error in volumes seven and three times greater in spatial extent than equivalent unoptimized standard configurations. This coil design method can be used to optimize active–passive magnetic field shaping systems that are compact and simple to manufacture, enabling accurate control of magnetic field changes in spatially confined experiments at low cost. [ABSTRACT FROM AUTHOR] |
|
Copyright of Journal of Applied Physics is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
