Colloquium Stef Janssens (CERN)

17 oktober 2014

Friday 17 October, 11:00h, at Nikhef in H331

Speaker: Stef Janssens (CERN)

Title: "Stabilisation and precision pointing quadrupole magnets in the Compact Linear Collider"

Abstract:
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. To this end, a stiff vibration isolation and positioning system has been designed that integrates with the other control systems in the accelerator. In this talk, the proposed integrated design using stiff piezoelectric actuators will be presented together with its control system and the validation through models and in tests with a prototype test stand.

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