The Wide-field Spectroscopic Telescope (WST): design trade-offs for the low-resolution multi-object spectrograph instrument
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 design and performance trade-offs for the Low-Resolution Multi-Object Spectrograph (MOS-LR) instrument. With a multiplex of 30,000 covering a field of view of 3.1 square degrees, this instrument will provide unprecedented survey efficiency, an order of magnitude beyond those of current facilities. Covering the 370 to 930 nm range at a resolving power of 3,000 with a sky-projected fiber diameter of 1 arcsec, this instrument faces extreme challenges in design, manufacturing, and maintenance. We present a systematic approach to trading off optical and mechanical design options, taking into account constraints such as volume and mass, but also projected availability of detectors and gratings etc.
Keywords
Cite
@article{arxiv.2607.24546,
title = {The Wide-field Spectroscopic Telescope (WST): design trade-offs for the low-resolution multi-object spectrograph instrument},
author = {Dimitri Buffat and Will Saunders and Kjetil Dohlen and Laurence Tresse and David Lee and Roland Bacon and Andrea Bianco and Laurane Fréour and Roelof de Jong and Etienne Burtin and Olaf Iwert and Virgile Meyer and Elizabeth George},
journal= {arXiv preprint arXiv:2607.24546},
year = {2026}
}