Study of the effect of the motor vibration on the interface points between the GLAO and ICOS subsystems of the Multi-Object Spectrograph (MOSAIC) for the Extremely Large Telescope

• Grant number: 25/02438-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: April 01, 2025
• End date: December 31, 2025
• Field of knowledge: Physical Sciences and Mathematics - Astronomy - Astronomical Instrumentation
• Principal Investigator: Beatriz Leonor Silveira Barbuy
• Grantee: Bruno Caixeta Piazza
• Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated research grant: 20/15245-2 - The multi-object spectrograph (MOSAIC) for the extremely large telescope: spectroscopy of stellar populations in the milky way and external galaxies, AP.ESP

Abstract

A fundamental aspect of advances in astrophysics relies on the quality and precision of data collected by high-performance instruments, such as the multi-object spectrograph MOSAIC (Multi-Object Spectrograph for Astrophysics, Inter-galacticmedium studies and Cosmology), designed for the Extremely Large Telescope (ELT) - the largest telescope in the world operating in the optical/near-infrared spectrum. This project aims to investigate the impact of vibration transmission associated with the operation of MOSAIC's main motor on the interface between the GLAO and ICOS subsystems. Considering that the motor is mounted on an elastic structure, the vibrations may beamplified, thereby compromising the stability and accuracy of the measurements. To this end, these effects must be evaluated through the adaptation of an existing finite element model and the conduction of dynamic simulations, with the objective of identifying the structure's resonance frequencies and developing mitigation strategies. Therefore, the project seeks to ensure the robust operation of MOSAIC and to provide observationsin accordance with the specifications of the European Southern Observatory (ESO),contributing to the acquisition of precise astronomical data and the advancement ofastrophysical research.