The Compact Linear Collider (CLIC), currently under study, aims to accelerate electrons and positrons towards the interaction point where they collide with a centre-of-mass energy of 0.5 to 3 TeV. In the main accelerator line, Main-Beam Quadrupole (MBQ) magnets are used to focus the beams. To have the best performance, these magnets need to be isolated from vibrations coming from the ground and external sources (water cooling, ventilation, etc.). The required integrated root mean square (r.m.s.) values of the vibrations down to 1 Hz are 1.5 nm vertically and 5 nm horizontally. The vibration isolation and positioning system has to integrate with the other control systems in the accelerator. This paper shows the proposed integrated design using stiff piezoelectric actuators, to be robust against external forces, and a new sensor especially developed for vibration isolation in an accelerator environment. The control system for the vibration isolation is validated in models and in tests with a prototype of the smallest type 1 magnet. These tests include the proposed water cooling and the nominal magnetic field. Additionally a prototype is used to prove the nano-positioning capability of the system.
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