The Thirty-Meter-Telescope
Project Update
Science in the 2020s Tucson Feb. 2018
Christophe Dumas TMT International Observatory 1 TMT Proprietary TMT.PMO.PRE.XX.XXX.RELXX 1 History of project
Thirty-Meter-Telescope (TMT) = Merging of 3 earlier concepts. Current cost ~1,500 M$ CELT: California Extremely Large Telescope (30m diameter). Caltech and Univ. California VLOT: Very Large Optical Telescope (20m diameter). Canadian Universities for Research in Astronomy (ACURA) GSMT: (30m diameter). National Optical Astronomical CELT Observatory (NOAO) & Gemini Observatory 2003: Foundation of TMT Observatory Corporation VLOT (Caltech, UC, ACURA) 2008: NAOJ joins 2009: Funding provided by G. & B. Moore Foundation 2014: Chinese & Indian partners officially join GSMT 2016: TMT International Observatory
TMT Proprietary TMT.PMO.PRE.XX.XXX.RELXX 2 History of project (Cont’d)
AURA is also an Associate Member of TMT on behalf of the US national community Through a cooperative agreement with the NSF, TMT and a US-SWG are developing a model for potential US national partnership in the TMT Organization of five TMT science forums International Science Development Teams Education & public outreach More info? Talk to Mark Dickinson at NOAO and/or check http://ast.noao.edu/system/us-tmt-liaison
TMT Proprietary TMT.PMO.PRE.XX.XXX.RELXX 3 Thirty Meter Telescope Site Locations
Site characteristics MKO ORM (median values, unless stated) (USA) (Spain) Altitude of site (m) 4050 2250 Fraction of yearly usable time (%) 72 72 Seeing at 60m above ground (arcsecond) 0.50 0.55 Isoplanatic angle (arcsecond) 2.55 2.33 Atmospheric coherence time (ms) 7.3 6.0 Precipitable Water Vapor (% of time < 54 20 2mm) Mean nighttime temperature (oC) 2.3 7.6 Extinction (V mag/airmass) 0.111 0.137
Ground dust concentration (µg/m³) Significant funding provided by the Gordon and Betty Moore Foundation0.815 1.006 TMT Proprietary TMT.PMO.PRE.XX.XXX.RELXX 4 Sites: Decision expected this April
MKO: ORM: 2016-2017: 1.5 years long 2017: Hosting Agreement MOU contested case signed between TIO and IAC Sep. 2017: BLNR approves the 2017: Collaboration agreement Construction District Use Permit signed between TIO, IAC, La Palma Today: Stronger and more “open” government & local municipality local support than in 2015 2018: Environmental Impact Still, obstacles lay ahead: Assessment (EIA) submitted to Appeal #1: Feb. 2017: To avoid island authorities (last step before another contested case on the applying for a construction permit) sublease between the UH and Environment is extremely positive TMT towards its support of TMT: “Oral arguments” mid-March ‘18 Project receives support at all Appeal #2: Oct. 2017: Appeal filed administrative and government by opponents about CDUP levels All government offices are No date has been set yet for oral coordinating their actions arguments
TMT Proprietary TMT.PMO.PRE.XX.XXX.RELXX 5 Current timeline
April 2018: Tentative date for a site decision by TIO Board Q2-Q4 2018: Realistic expectation to have safe & legal mountain access granted in Hawaii and/or Spain 1st semester 2019: Start of Construction in Hawaii or Spain 2020-2022: Enclosure assembly End 2023: End construction of all summit buildings 2022-2024: Telescope structure integration 2024-2027: AIV, commissioning 2028: “First-light”
TMT Proprietary TMT.PMO.PRE.XX.XXX.RELXX 6 The Thirty-Meter-Telescope and its systems
Ritchey-Chrétien optical design M1: 30m hyperboloidal f/1 M2: 3.1m convex hyperboloidal (AM2 studies started) M3: Flat 2.5m x 3.5m
f/15 final focal ratio 20 arcmin FoV (2.62m ø)
Up to 8 instruments on two Nasmyth platforms AO at first-light (NFIRAOS)
TMT Proprietary TMT.PMO.PRE.XX.XXX.RELXX LGSF (MCAO, MOAO) 7 TMT systems
Ritchey-Chrétien optical design M1: 30m hyperboloidal f/1 M2: 3.1m convex hyperboloidal (active) M3: Flat 2.5m x 3.5m f/15 final focal ratio 20 arcmin FoV (2.62m diameter) Up to 8 instruments on two Nasmyth platforms AO at first-light (NFIRAOS) LGSF (MCAOS, MOAO) TMT Proprietary TMT.PMO.PRE.XX.XXX.RELXX 8 Project status (systems)
All critical systems are in advanced status of design, or have already started construction Common Software: Started construction Enclosure, AO, M1 optics, Telescope structure, summit facilities: All in FD phase Nearly half of all M1 blanks have already been fabricated IRIS (1st light instrument): Also in FD phase
TMT Proprietary TMT.PMO.PRE.XX.XXX.RELXX 9 TMT Enclosure is Completing Final Design phase
TMT Proprietary TMT.PMO.PRE.XX.XXX.RELXX 10 M1 Segment Polishing at IIA
The reference sphere vendor has been selected, Callaghan Innovation, New Zealand. The Crest polishing facility near Bengaluru is to be completed in early 2018 to house technology from Coherent.
TMT Proprietary TMT.PMO.PRE.XX.XXX.RELXX 11 OPT: Prototype Segment installed in MSIT SSA fabricated in India by Godrej
TMT Proprietary TMT.PMO.PRE.XX.XXX.RELXX 12 CTR: Observatory Safety System
Working towards a unified approach across the observatory for functional safety and access control First promulgation with Structure and Enclosure design teams Met with Fortress twice to discuss trapped key solutions and ability to monitor keys and gates Observatory hazard access control analysis is ongoing Added situational awareness in control room to the scope of the Observatory Safety System preliminary design work.
TMT Proprietary TMT.PMO.PRE.XX.XXX.RELXX 13 Defining Capabilities in the TMT Discovery Space
Adaptive Optics required
TMT Proprietary TMT.PMO.PRE.XX.XXX.RELXX 14 TMT (envisioned) instruments suite
Feasibility studies for next generation instruments will start next year
TMT Proprietary TMT.PMO.PRE.XX.XXX.RELXX 15 AO system & IRIS in FD phase
IRIS PDR -1 & -2 passed successfully in Nov. 2016 and Sep. 2017 FD phase will last for ~ 3years Final design for all components, including software AO system (NFIRAOS): RTC (real-time-controller) FDR passed in Dec. 2017 Upcoming: NFIRAOS FDR: July 2018 Visible cam FDR: Sep. 2018
NFIRAOS IRIS OIWFS IRIS support structure
IRIS science cryostat
IRIS cable wrap
TMT Proprietary TMT.PMO.PRE.XX.XXX.RELXX 16 WFOS: Fiber vs slicer designs
“Slicer-WFOS” “Fiber-WFOS” • Slit-slicer modules at the focal plane • Factor of ~10 gain in multiplex with high-performance VPH gratings • IFU GLAO mode opens new science
Down-select planned by end of April 2018 17 Feb 2018: WFOS team presents trade studies Mar 2018: SAC and technical peer-reviews Apr 2018: Down-select committee reaches final consensus/decision.
TMT Proprietary TMT.PMO.PRE.XX.XXX.RELXX 17 TMT Science Forum 2017 White papers on future instruments
Goal of November Forum was to prepare teams to respond to Call for White Papers on TMT next generation instruments Call released in Sep. 2017 new instruments and adaptive optics systems, other technical developments Deadline to respond March 21, 2018 SAC to review instrument concepts, define priorities, and make recommendation to TMT Board TMT Board expected to support some feasibility studies TMT first-light currently expected to happen in 2028 Instruments development need > 10 years, hence it is time to start study of instrument concepts for next-generation!
TMT Proprietary TMT.PMO.PRE.XX.XXX.RELXX 18 Acknowledgments
The TMT Project gratefully acknowledges the support of the TMT collaborating institutions. They are the Association of Canadian Universities for Research in Astronomy (ACURA), the California Institute of Technology, the University of California, the National Astronomical Observatory of Japan, the National Astronomical Observatories of China and their consortium partners, and the Department of Science and Technology of India and their supported institutes. This work was supported as well by the Gordon and Betty Moore Foundation, the Canada Foundation for Innovation, the Ontario Ministry of Research and Innovation, the National Research Council of Canada, the Natural Sciences and Engineering Research Council of Canada, the British Columbia Knowledge Development Fund, the Association of Universities for Research in Astronomy (AURA), the U.S. National Science Foundation and the National Institutes of Natural Sciences of Japan.
TMT Proprietary TMT.PMO.PRE.XX.XXX.RELXX 19