Results on Ultra-Precise Magnet Yoke Sectors Assembly Tests

Due to beam dynamics requirements and to reduce the cost and power consumption for the next generation of particle accelerators, their magnet systems need to be more and more compact and precise. As a consequence, the required tolerances on machining and assembling of components like the electro-magnet iron yoke sectors are becoming tighter. R&D and prototypes procurement for future projects like the Compact Linear Collider require quadrupole yoke quadrants machined with micrometric precision, and assembled with an overall precision in the range of ±10 μm. A test program was launched at CERN in order to investigate the feasibility of such tight assembly tolerances. The program consists in testing three different types of assembly methods for ultra-precise dummy quadrants produced by electro discharge machining. The aim is to identify the best performing assembly procedures for magnet iron yokes. In this paper the first relevant results of this test program are presented and discussed.