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Mecatronics 2008, 7th France-Japan (5th Europe-Asia) Congress on Mechatronics, Le Grand Bornand : France (2008)
Active stabilization studies at the sub-nanometer level for future linear colliders
N. Geffroy1, L. Brunetti1, B. Bolzon1, A. Jérémie1, B. Caron2, J. Lottin2

The next collider which will be able to contribute significantly to the comprehension of matter is a high energy linear collider. The luminosity of this collider will have to be of 1035cm-2s-1, which imposes a vertical beam size of 0,7nm. The relative motion between the last two focusing magnets should not exceed a third of the beam size above 4Hz. Ground motion and acoustic noise can induce vibrations that have to be compensated with active stabilisation. In this paper, we describe the three aspects needed for such a development. We have assessed sensors capable of measuring sub-nanometre displacements, performed numerical calculations using finite element models to get the dynamic response of the structure, and developed a feedback loop for the active stabilisation. Combining the expertise into a mecatronics project made it possible to obtain a displacement RMS at 5Hz of 0.13nm at the free end of our prototype.
1 :  LAPP - Laboratoire d'Annecy le Vieux de Physique des Particules
2 :  SYMME - Laboratoire SYstèmes et Matériaux pour la MEcatronique
Physique/Mécanique/Matériaux et structures en mécanique

Sciences de l'ingénieur/Mécanique/Matériaux et structures en mécanique
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