New sensor and non-contact geometrical survey for the vibrating wire technique

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 811; pp. 115 - 123
• Main Authors: Geraldes, Renan, Junqueira Leão, Rodrigo, Cernicchiaro, Geraldo, Terenzi Neuenschwander, Regis, Citadini, James Francisco, Droher Rodrigues, Antônio Ricardo
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2016
• Subjects: Alignment; Amplifiers; Coordinate measuring machines; Detectors; Fiducialization; Geometrical survey; Magnetic bench; Magnets; Particle accelerator alignment; Quadrupole; Sensors; Spectrometers; Synchrotron light source; Wire; Quadrupole; Synchrotron light source; Fiducialization; Geometrical survey; Magnetic bench; Particle accelerator alignment
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/j.nima.2015.12.016

The tolerances for the alignment of the magnets in the girders of the next machine of the Brazilian Synchrotron Light Laboratory (LNLS), Sirius, are as small as 40µm for translations and 0.2mrad for rotations. Therefore, a novel approach to the well-known vibrating wire technique has been developed and tested for the precise fiducialization of magnets. The alignment bench consists of four commercial linear stages, a stretched wire, a commercial lock-in amplifier working with phase-locked loop (PLL), a coordinate measuring machine (CMM) and a vibration sensor for the wire. This novel sensor has been designed for a larger linear region of operation. For the mechanical metrology step of the fiducialization of quadrupoles an innovative technique, using the vision system of the CMM, is presented. While the work with pitch and yaw orientations is still ongoing with promising partial results, the system already presents an uncertainty level below 10µm for translational alignment.