Abstract
The next generation of linear colliders is very demanding concerning the alignment tolerances of their components. For the CLIC project, the reference axis of the components will have to be pre-aligned within 10 μm at 1 sigma with respect to a straight line in a sliding window of 200 m. A solution based on stretched wires with wire positioning sensors has been proposed in order to fulfill the alignment requirements in the Conceptual Design Report of the project. This solution has some drawbacks and laser based alternative solutions are under study in order to validate the wire solution and possibly replace it. A new proposal is introduced in this paper, using a laser beam over 150 m as a straight alignment reference, with the objective of having an uncertainty in the determination of its straightness within 10 μm. Sensors coupled to the components to be aligned, would provide after calibration the horizontal and vertical offsets with respect to the laser beam, within a few micrometers, in their coordinate system. The method is based on the laser beam space stabilization effect when a beam propagates in atmospheric air inside a pipe with standing acoustic wave. The principal schemes of corresponding optoelectronics devices and temperature stabilization solutions are also proposed, making probable the extension of the laser fiducial line up to a 500 m length.
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References
M. Anastasopoulos, N. Chritin, S. Griffet, J. Kemppinen, H. Mainaud Durand, V. Rude, and G. Sterbini, “Theoretical and practical feasibility demonstration of a micrometric remotely controlled pre-alignment system for the CLIC linear collider,” EuCARD-CON-2011-039, p. 547–549.
A Multi-TeV Linear Collider Based on CLIC Technology: CLIC Conceptual Design Report, CERN-2012-007.
A. Geiger, F. Lackner, H. Mainaud Durand, D. Piedigrossi, and G. Stern, “Feasibility study of multipoint based laser alignment system for CLIC,” International Workshops on Accelerator Alignment, Batavia, USA, 10–14 September 2012.
V. Batusov, J. Budagov, M. Lyablin, and A. Sissakian, “On some new effect of laser ray propagation in atmospheric air,” Phys. Part. Nucl. Lett. 7(5), 359–363 (2010).
V. Batusov, J. Budagov, M. Lyablin, and A. Sissakan, “Observation of specific features of laser beam with propagation in air standing acoustic waves,” Phys. Part. Nucl. Lett. 7(1), 33–38 (2010).
V. Batusov, J. Budagov, J. C. Gayde, J. Khubua, C. Lasseur, M. Lyablin, N. Russakovich, A. Sissakian, and N. Topilin, “A study of an air medium influence on the rectilinearty of laser ray proliferation towards the using for large distances and high precision metrology,” Phys. Part. Nucl. Lett. 4(1), 92–95 (2007).
V. Batusov, J. Budagov, and M. Lyablin, “A laser sensor of a seismic slope of the earth surface,” Phys. Part. Nucl. Lett. 10(1), 43–48 (2013).
V. Batusov, J. Budagov, J. Khubua, C. Lasseur, M. Lyab- lin, M. Russakovich, A. Sissakian, and N. Topilin, “On a laser beam fiducial line application for metrological purposes,” JINR Commun. E13-2007-98. Dubna, 2007.
O. Wallner, W. R. Leeb, and P. J. Winzer, “Minimum length of a single mode fiber spatial filter,” J. Opt. Soc. Am. A 19(12), (2002).
A. Freise and K. Strain, “Interferometer techniques for gravitational wave detection,” Living Rev. Relativity 13, 1 (2010).
http://en.wikipedia.org/wiki/Gaussian_beam#Laguerre-Gaussian_modes.
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Budagov, J., Glagolev, V., Lyablin, M. et al. A laser based fiducial line for high precision multipoint alignment system. Phys. Part. Nuclei Lett. 11, 286–293 (2014). https://doi.org/10.1134/S1547477114030042
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DOI: https://doi.org/10.1134/S1547477114030042