1D shimming coil design and optimisation algorithm by Dr. Yujie Zhao University of St. Andrews, Scotland https://yujiephysics.wordpress.com/2023/11/09/nmr-maget-shimming-and-current-driver-design/
Highlights: In the project, our primary goal was not to develop a practical compensation system but to explore the mathematical methods, electronic and digital technologies required for future customized systems in our measurement installations.
Along this path, we have made significant progress:
➢Proposed a shimming coil architecture using a planar spiral coil system.
➢Tested Python algorithms for numerical optimization of functionals with a large number of variables.
➢Explored the Python symbolic calculus library SymPy, enabling complex calculations like derivatives.
➢Developed and tested a low-cost multi-channel PWM driver circuit with a current booster, facilitating the powering of numerous individual coils.
➢ Presented a scheme for testing electronic drivers using the Arduino microcontroller.
➢ Tested the MCP2221 USB-to-I2C adapter, allowing direct computer control of the multi-channel PWM drivers PCA9685 without the need for a microcontroller.
➢ Demonstrated effective heat management of electronic devices using voltage regulators and transistors.
➢ Identified potential manufacturing technologies for planar spiral coils.
➢ Successfully manufactured a working prototype of a four-channel electronic driver.
For more details, please read the report: "Design and optimisation of 1D shimming coils.pdf". The purpose of each project folder can be found in the report Appendix. You will have to tinker a little to install the Python libraries for MCP2221 and PCA9685. In the report we provide relevant links to the Adafruit website.