New preprints from Astrophysics Letters describe work in progress on Work Package 4.5 for the Wide-field Spectroscopic Telescope (WST), a planned 12-meter-class facility focused on large spectroscopic surveys. The Wide-field Spectroscopic Telescope High-Resolution Multi-Object Spectrograph (MOS-HR / HR-MOS) is designed to deliver a resolving power of R = 40,000 and a multiplexing capability of about 2,000 targets. One paper details the mechanical design and optomechanical architecture for the high-resolution spectrograph. It presents an approach that divides the instrument into four larger modules, each made up of two sub-modules, using a vertical optical bench configuration with optical elements mounted on both sides. The authors describe steps for translating the baseline optical prescription into a full mechanical model, defining mounting and alignment interfaces, and conducting preliminary static, modal, and seismic analyses to assess performance under operational and survival loads. Another paper reports the current status of the HR-MOS, including the organization of an international team and how the optical design has evolved through trade-off studies driven by scientific requirements and technical constraints, as well as envelope dimensions and mass estimates, fiber specifications, and structural stability analyses. Both reports describe modular architecture and include mechanical performance evaluations alongside feasibility considerations.
WST High-Resolution Multi-Object Spectrograph: new mechanical and design-status reports
New preprints from Astrophysics Letters describe work in progress on Work Package 4.5 for the Wide-field Spectroscopic Telescope (WST), a planned 12-meter-class facility focused on large spectroscopic...
- WST is a planned 12-meter-class dedicated spectroscopic facility for large surveys.
- The HR-MOS is designed for resolving power R = 40,000 and multiplexing of about 2,000 targets.
- Instrument design work is organized under Work Package 4.5 and focuses on the high-resolution multi-object spectrograph module.
- The mechanical architecture divides the spectrograph into four larger modules, each with two sub-modules, using a vertical optical bench layout with optical elements mounted on both sides.
- Preliminary structural studies include static, modal, and seismic analyses to evaluate alignment accuracy, stability, and robustness under operational and survival loads.
arXiv:2607.01968v1 Announce Type: new Abstract: The Wide-field Spectroscopic Telescope (WST) is a planned 12-meter class dedicated spectroscopic facility for massive spectroscopic surveys. This paper presents the current status of Work Package 4.5, the High Resolution Multi-Object Spectrograph (HR-MOS) module. We describe the international team organization and optical design resulting from extensive trade-off studies, presenting its evolution driven by scientific requirements and technical constraints. Design parameters derived from science cases and astronomical community requirements are detailed. Given the critical importance of mass and volume budgets, we present envelope dimensions and mass estimates for HR-MOS. The spectrograph constructive parameters are defined, including optical fiber specifications, multiplex capability, and modular architecture. Finally, we present the structural analysis addressing mechanical stability and performance requirements for this high-resolution multi-object spectrograph.
3 hours agoarXiv:2607.01132v1 Announce Type: new Abstract: The Wide-field Spectroscopic Telescope (WST) is a planned 12-meter-class dedicated spectroscopic facility designed to address key scientific challenges through large spectroscopic surveys. This paper presents the current status of Work Package 4.5, which focuses on the High-Resolution Multi-Object Spectrograph (MOS-HR) module for WST. The MOSHR instrument is expected to provide a resolving power of R = 40,000 with a multiplexing capability of about 2,000 targets. The mechanical design activities carried out for the development of the HR spectrograph and for the definition of its optomechanical architecture are described. To account for both the scientific requirements of the spectrograph and the manufacturability constraints associated with such a complex instrument, the mechanical layout has been organized into four larger modules, each containing two sub-modules. Guided by feasibility considerations, such as mechanical performance, available volume, and fabrication and assembly aspects, each sub-module adopts a vertical optical bench configuration with optical elements mounted on both sides. Starting from the baseline optical design, the mechanical configuration has been developed to achieve the required alignment accuracy, structural stability, and environmental robustness. The workflow includes the translation of the optical prescription into a complete mechanical model, the definition of the main mounting and alignment interfaces, and preliminary static, modal, and seismic analyses to evaluate performance under operational and survival loads. As an outcome, the proposed design provides architecture that enables preliminary estimates of mass, volume, cost, and mechanical performance in terms of deformation, stress, and modal behavior of the modules.
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