Design and Manufacture of a Hybrid Final Focus Quadrupole Model for CLIC

A tunable hybrid quadrupole magnet design has been proposed for the final focus in the Compact Linear Collider (CLIC) that is currently under study. The proposed design is a combination of an iron dominated electromagnetic quadrupole with a bore diameter of 8.25 mm with permanent magnet blocks placed between the poles made of soft magnetic CoFe alloy “Permendur”. The possibility of using Sm₂Co₁₇ and Nd₂Fe₁₄B as material for the permanent magnet blocks has been investigated. It is shown that a very high field gradient of 530 T/m (Sm₂Co₁₇)and 590 T/m (Nd₂Fe₁₄B)can be achieved.