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TY - CONF AU - Stern, G. AU - Geiger, A. AU - Guillaume, S. AU - Mainaud Durand, H. AU - Piedigrossi, D. AU - Sandomierski, J. AU - Sosin, M. ED - Petit-Jean-Genaz, Christine ED - Arduini, Gianluigi ED - Michel, Peter ED - Schaa, Volker RW TI - Experiments of Laser Pointing Stability in Air and in Vacuum to Validate Micrometric Positioning Sensor J2 - Proc. of IPAC2014, Dresden, Germany, June 15-20, 2014 C1 - Dresden, Germany T2 - International Particle Accelerator Conference T3 - 5 LA - english AB - Aligning accelerator components over 200m with 10 μm accuracy is a challenging task within the Compact Linear Collider (CLIC) study. A solution based on laser beam in vacuum as straight line reference is proposed. The positions of the accelerator’s components are measured with respect to the laser beam by sensors made of camera/shutter assemblies. To validate these sensors, laser pointing stability has to be studied over 200m. We perform experiments in air and in vacuum in order to know how laser pointing stability varies with the distance of propagation and with the environment. The experiments show that the standard deviations of the laser spot coordinates increase with the distance of propagation. They also show that the standard deviations are much smaller in vacuum (8 μm at 35m) than in air (2000 μm at 200m). Our experiment validates the concept of laser beam in vacuum with camera/shutter assembly for micrometric positioning over 35m. It also gives an estimation of the achievable precision. PB - JACoW CP - Geneva, Switzerland SP - 1793 EP - 1795 KW - laser KW - vacuum KW - experiment KW - alignment KW - linear-collider DA - 2014/07 PY - 2014 SN - 978-3-95450-132-8 DO - 10.18429/JACoW-IPAC2014-TUPRI094 UR - http://jacow.org/ipac2014/papers/tupri094.pdf ER -