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International Particle Accelerator Conference - IPAC'12, New Orleans : États-Unis (2012)
Development of Nanometer-scale Stabilization at the Interaction Point of the ATF2 Final Focus Prototype at KEK ( Japan)
P. Bambade1, F. Bogard1, S. Wallon1, R. Apsimon, D.R. Bett, N. Blaskovic Kraljevic, P. Burrows, G.B. Christian, M.R. Davis, C. Perry, A. Heo, S.W. Jang, E.-S. Kim, Y. Honda2, T. Tauchi2, N. Terunuma2
ATF Collaboration(s)

The ATF2 final focus prototype features an ultra-low emittance beam focused down to a less than 40 nm vertical beam size at the focal point. The development of dedicated instrumentation enabling the fluctuations of the beam to be measured with a few nm accuracy, as input to a feedback control loop, is reported. A set of special low-noise cavity-BPMs has been prepared with a decay constant short compared to the 300 ns time separation of ILC-like bunch trains which will be used. Installation is planned in a new vacuum vessel, custom made to provide adjustment capabilities in three dimensions for in situ relative alignment and calibration purposes. A fast kicker and feedback algorithm are in preparation for deployment later in the year.
1 :  LAL - Laboratoire de l'Accélérateur Linéaire
2 :  KEK - High Energy Accelerator Research Organization
Physique/Physique/Physique des accélérateurs