Dr Hélène Mainaud Durand, the Engineering department, CERN, Switzerland

Title
Advances in Large Volume Metrology in particles accelerators
Abstract
The next generation of particle accelerators for the post LHC era is under study at CERN. Both the Future Circular Collider and the Compact Linear Collider, if chosen and built, will produce a very large number of particle collisions at a very high energy. In practice, this means that two particle beams of sub-micrometric transversal dimensions will have to meet each other over a shooting length of tens of meters. The size of the beam has a direct impact on the performance of the collider, in particular in the number of collisions achieved, and  will have to be preserved over the length of the machine, especially concerning linear colliders. This translates into very tight tolerances concerning the position of the accelerator components, in the order of microns over several hundreds of meters. To achieve such tight tolerances, specific alignment methods have been studied, developed and qualified at CERN. These methods combining wire offsets measurements, hydrostatic levelling measurements and Frequency Scanning Interferometry, will be presented considering different applications cases.
Biography
Hélène Mainaud Durand is deputy leader of the Survey, Mechatronics and Measurement group (150 persons) in the Engineering department at CERN. She is more specifically in charge of all specific alignments in accelerators and detectors, needing sensors, actuators and a high accuracy of measurement, supervising a multi-disciplinary team of 15 persons. She is vice-president of the European Society of Precision Engineering and Nanotechnology. She is the author of more than 70 papers on survey and alignment in particle accelerators.