collimator

This is a collection of scripts to design 3d printed radial collimators.

Prerequisite & Setup

as this project is not stable yet and there are still pathes everywhere in the scripts it is suggested to put a link to the git in the user home

$ cd ~
$ ln -s [PATH TO collimator git] collimator.git

• FreeCAD
  • tested with FreeCAD 0.18 (Linux App Image)
  • To have the scripts availabe in the either change the User macros location or link the files inside FreeCAD_scripts to the default user macros location (ln -s collimator.git/FreeCAD_scripts/Collimator.FCMacro ~/.FreeCAD/MacroCollimator.FCMacro)

Steps to design a (Soller) collimator

1. create grid

• using python

  to come

• using Mathematica

  to come

2. create 3d model

• using FreeCAD

  • put the correct pathes in the /.FreeCAD/Macro

• OpenSCAD

  _to_come

3. validate 3d model

This is the procedure to do some raytracing on the files generated in the steps above.

• convert a .stl file into .inc as povray

$ python2.7 external_tools/py-stl-3.1/stl2pov.py RadialCollimator.stl RadialCollimator.inc

• For the follwoing steps some python dependencies need to be installed e.g. in conda enviroment:

conda create --name collimator_env python=3.7
conda activate collimator_env
conda config --env --append channels conda-forge
conda install silx moviepy scipy numpy matplotlib imageio jupyter pyyaml
pip install vapory

• run povray using

$ ./raytracing/run_rings_povray.sh
--- or --- if you happen to have a cluster at hand:
$ oarsub -l nodes=1/core=8,walltime=00:02:00 ./raytracing/run_rings_povray.sh

• look at the results in a jupter notebook

$ cd raytracing
$ jupyter notebook

Software dependencies

• python
• FreeCAD
• OpenSCAD
• povray

Further reading

• A novel 3D printed radial collimator for x-ray diffraction by S. Kowarik, L. Bogula, S. Boitano, F. Carlà, H. Pithan, P. Schäfer, H. Wilming, A. Zykov and L. Pithan

Thanks to ...

• py-stl-3.1 by Roland Smith ... the corresponding packages are parcially redistributed in \external_toos