Spec-S5
With first-light in the 2030s, Spec-S5 will be the premier instrument to probe both epochs of accelerated expansion. By mapping 10x more linear modes than DESI + Rubin + CMB-S4 it will dramatically increase our knowledge of early universe physics by mapping the imprint of primordial features over an enormous volume of the distant universe. Follow the links above to learn more about our key science, instrument design, meetings, documents, and community. Read our white paper
Creating a supportive and productive working environment
The Spec-S5 Project respects all individuals and expects a positive, supportive, and inclusive environment amongst its members and stakeholders. Read our Code of Conduct
Response to 2026 SCAC townhall
Spec-S5 was omitted from the Subcommittee’s facilities list, despite being rated “absolutely central” scientifically and “ready to initiate construction” by the 2024 HEPAP Facilities Subpanel. This letter urged the panel to prioritize Spec-S5 in its roadmap and support the design, R&D, and cost development needed to advance toward approval and construction. Read the letter here and sign to support:https://tinyurl.com/4zm9k572