The Cern Proton-Synchrotron (PS) is a fascinating machine. While there are many synchrotrons around the world, this one started its operation in 1959. The PS, which is nowadays part of the acceleration chain of the Large Hadron Collider (LHC), measures 628 meters of circumference. It was the first strong-focusing synchrotron (or alternating-gradient focusing), at a time when synchrotrons look like the BLN Cosmotron.
The PS main magnet units combine dipole and quadrupole magnetic functions, weight more than 30 tons and are around 4.2 meters long.
There are a 100 of these magnets along the PS ring. Some coils have been replaced, but they are still the same and the yokes are untouched.
For more details about the PS and its history, there is a complete and nicely written report available on the Cern website: http://cds.cern.ch/record/1359959
In 1959 John Adams (leader of the construction team at that time) announced the successful acceleration of protons up to 24GeV.
If you pay attention, on the picture you can spot a small scale model on the desk.
That is the target of this blog post.
There is plenty of documentations and archives at Cern, and it was impressive to find the original mechanical drawings of the magnets. So I started Fusion360 and played with the drawings. Of course, there are yet 3D models files, but they are extremely detailed and it would shortcut the fun.
Let start with the yokes:
The magnet blocks stand:
Coils, supports and feet:
And let’s print it :
The scale is 1:20 and pictures bellow show the difference with the real thing:
The STL files are in this repository : https://github.com/pierre-muth/PSMagnet
Thanks for reading !
Images from Cern are free of charge for educational and informational use. The Cern term of use for audiovisual media can be find here : https://copyright.web.cern.ch/ . This project was realized as a hobby, outside Cern.