Co-authors. Patrick J. McCarthy Rebecca Bernstein George Angeli David Ashby Bruce Bigelow Antonin Bouchez William Burgett Eric Chauvin Adam Contos

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2 Co-authors Patrick J. McCarthy Rebecca Bernstein George Angeli David Ashby Bruce Bigelow Antonin Bouchez William Burgett Eric Chauvin Adam Contos Francisco Figueroa Peter Gray Frank Groark Robert Laskin Rafael Milan-Gabet Andrew Rakich Rodrigo Sandoval Marti Pi Nune Wheeler 2

3 Outline Organizational, Requirements & Process Telescope Design Status Primary Mirror Production Status Adaptive Optics and Wavefront Control Scientific Instruments Site Master Plan Site Construction Status Project Staging & Schedule 3

4 GMT Partnership Korea Sao Paulo, Brazil Texas A&M Arizona 4

5 GMTO Organization 5

6 Systems Engineering (see Angeli et al. SPIE ) 6

7 Telescope Design Status Seismic Hazard Analysis (see Irarrazaval et al. SPIE ) Probabilistic basis for revised Site-specific seismic hazard analysis Enables fragility analysis for optical elements Design levels: 1. Rigidity-level ARP* = 2 years, PGA = 0.03g 2. Operational-level ARP = 100 years, PGA = 0.27g 3. Survival-level ARP = 2,475 years, PGA = 0.83g * average return period peak ground acceleration 7

8 Telescope Design Status Seismic Isolation (2-D) (see Manuel et al. SPIE ) Single Friction Pendulum 8

9 Telescope Design Status Mount Development 1,000 metric tonnes of precision steel mechanism 3-axis motion Elevation, Azimuth, Gregorian instrument rotator Two industry teams performing Stage 1 design studies MT Mechatronics (Mainz, Germany) teamed with AMOS & Ingersoll Machine Tools IDOM (headquartered in Bilbao, Spain with offices in Minneapolis, Minnesota) Down-select planned for late 2018 PDR in 2019 CDR in

10 Telescope Design Status M2 Secondary Mirrors (see Thompson et al. SPIE ) Telescope Mount Top End M2 Positioner Secondary Mirrors 10

11 Primary Mirror Production Status (see Martin et al. SPIE ) S1 S4 4 S S5 Glass for 6 & 7 In Hand S3 11

12 Primary Mirror Production Status Segment 5 12

13 Primary Mirror Production Status Richard F. Caris Mirror Lab University of Arizona 13

14 Telescope Design Status Alignment Metrology (see Rakich et al. SPIE ) Absolute distance measuring interferometer laser truss Commercial product from Etalon Ag Measurement uncertainty of 0.5 µm/m over distances > 30m Prototyping underway on the Large Binocular Telescope (LBT) 14

15 Adaptive Optics & Wavefront Control (see Bouchez et al. SPIE & Kopon et al. SPIE ) Acquisition, Guiding & Wavefront Sensing (AGWS) in detailed design phase Provides necessary wavefront sensing for natural seeing & GLAO observing modes Feedback for phase piston alignment of primary mirror segments Prototyping infrared dispersed fringe sensor on Magellan Clay telescope 15

16 Scientific Instruments Instrument stations: Direct Gregorian (DG) x 4 Gravity Invariant (GIS) Folded Port (FP) x 3 Instrument Platform (IP) Auxiliary Port (AP) x 2 16

17 Scientific Instruments (Szentgyorgyi et al , DePoy et al , Sharp et al ) G-CLEF is furthest along High-resolution optical spectrograph (& PRV) In final critical design phase; spectrograph CDR later this year Gravity Invariant Station Other instruments in conceptual or preliminary design & technology demonstration 17

18 Scientific Instruments (Lawrence et al, SPIE & Kuehn et al, SPIE ) MANIFEST fiber feed Enhances G-CLEF & GMACS spectrographs Leverages wide (20 arc min) FOV Self-motile fiber heads On-sky demonstrator TAIPAN being commissioned on UK Schmidt at Siding Spring Observatory 18

19 Site Master Plan (Bigelow et al. SPIE ) Las Campanas Observatory D E A LCO Access Road refractive index gradient B GMT Main Access Road B C GMT Loop Road C D Summit Site (2514m) E Support Site No. 1 (2426m) A F Support Site No. 2 (2385m) F Pan American Highway 0m N Wind Prevailing 19

20 Summit Site Rendering (Bigelow et al. SPIE ) A D B C A B C D Enclosure Summit Support Building Summit Utility Building Summit Office Building 20

21 Hard Rock Excavation Begins in July (Core and Micropile drilling nearing completion) WSP selected for construction management 21

22 Aerial view of GMT Site at Las Campanas (Support Sites #1 & #2 in foreground) 22

23 Construction Workers Residence (Can house construction crew of 200) 23

24 Visitors Residence (Houses GMTO staff and visitors) 24

25 Project Staging & Scheduling 1. First Light with subset of M1 mirror segments & scientific instrument for natural seeing 2. Build out primary mirror to 7 segments, develop Adaptive Secondary Mirrors, add instruments 3. Complete Adaptive Optics Capability Next Steps Foundation Excavation imminent Mount Contractor Down-Select 2018 Concrete 2019 Enclosure Procurement 2020 First Light not earlier than

26 Summary GMT is making progress on many fronts 2 nd mirror segment is in final polishing 5 th mirror segment is cast Mount is under contract with industry Site infrastructure is complete Site excavation is imminent

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28 Thank You! 30