CERN Accelerating science

EuCARD Conference Paper
Report number	EuCARD-CON-2010-034
Date(s), location
Imprint	2010
Title	Development of an Eccentric CAM Based Active Pre-Alignment System for the CLIC Main Beam Quadrupole Magnet
Author(s)	Lackner, F (CERN) ; Artoos, K (CERN) ; Collette, C (CERN) ; Mainaud Durand, H (CERN) ; Hauviller, C (CERN) ; Kemppinen, J (CERN) ; Leuxe, R (CERN)
WP	9: Technology for normal conducting higher energy linear accelerators
Task	9.3: Linac & FF Stabilization
Abstract	CLIC (Compact Linear Collider) is a study for a future electron-positron collider that would allow physicists to explore a new energy region beyond the capabilities of today's particle accelerators. The demanding transverse and vertical beam sizes and emittance specifications are resulting in stringent alignment and a nanometre stability requirement. In the current feasibility study, the main beam quadrupole magnets have to be actively pre-aligned with a precision of 1 µm in 5 degrees of freedom (d.o.f.) before being mechanically stabilized to the nm scale above 1 Hz. This contribution describes the approach of performing this active pre-alignment based on an eccentric cam system. In order to limit the amplification of the vibration sources at resonant frequencies a sufficiently high Eigenfrequency is required. Therefore the contact region between cam and support was optimized for adequate stiffness based on the Hertzian theory. Furthermore, practical tests performed on a single degree of freedom mock-up will show the limitation factors and further improvements required for successful integration in a full scale quadrupole mock-up presently under design.

Email contact: [email protected]