This tool can create an OpenSCAD geometry of a halbach cylinder which generates a homogeneous magnetic field inside. It can also generate the files needed, to perform a FEM simulation with Gmsh + GetDP. The design is fully parameterized so that it can easily be adapted. The parameters of the magnet are encapsulated in a json file. In addition to parameters, custom SCAD code can be specified in the json file, so that structures which are not parameterized, ie coil mounting planes, can be realized. An example can be found in examples/mri1.json.
To frabricate the individual slices by milling or 3d printing, you can import the OpenSCAD model into FreeCAD and then export a separate file for every slice.
- pip install -U pip
- pip install -r requirements.txt
- run 'python HalbachMRIDesigner.py examples/mri1.json --contour --quiver' with python 3.8 or higher
- the generated .scad file should look like examples/cylinder.scad
- in OpenSCAD it should look like this
- install OpenSCAD (https://openscad.org/)
- change Edit->Preferences->Advanced
- Turn off rendering at 1000000
- CGAL Cache size 1000
- PolySet Cache size 1000
- open cylinder.scad
- File->export->CSG
- Import .csg file into FreeCAD
Install sparselizard from here and spylizard from here.
To create files needed for a FEM simulation, add "--fem" to the command line when executing HalbachMRIDesigner.py. The generated .pro file can then be loaded into ONELAB(https://onelab.info/) for performing the FEM simulation.
- Benjamin Menkuec (code and ideas)
- Lukas Winter (ideas)
- Thomas O'Reilly (ideas, (https://github.com/LUMC-LowFieldMRI/HalbachOptimisation))
GNU Version 3