Performance of the Optimized Mechanical Design of the CLIC Main-Beam Quadrupole Magnet Prototype

The Main-Beam Quadrupole (MBQ) magnets of CLIC, the Compact Linear Collider understudy at the CERN Laboratory in Geneva, are part of a critical magnet family, considering the industrial production challenges. An R&D program on the MBQ magnets was launched in 2010 for studying and investigating several assembly solutions in order to minimize the procurement cost of a large series of magnets comprising more than 4000 units. In this paper, the performance of the latest configuration is presented, comparing the results of magnetic measurements with previous magnet model variants. Innovative solutions for an efficient and fast fiducialization of the MBQ quadrupoles and alignment with respect to beam trajectory were also studied and developed inside the PACMAN Project, a CERN project supported by the European Union via the 7th Framework Programme Marie Curie actions. The advantages of the mechanical design of the iron yoke and the assembly and alignment procedures are presented and discussed.