Excerpt from a Mechanical Interface Control Document showing where sonic anemometers (wind speed sensors) will be located on the telescope structure. The telescope-mounted sensors and sensor stations are identified in the Space Envelope drawings
Diagram of the CRYO space envelopes layout (in blue) on the Nasmyth platforms. CRYO will provide liquid nitrogen cooling to first-light instruments.
During installation of the TMT telescope, metrology frames will be used for initial alignment of TMT Primary Mirror segments.
First TMT M1 Metrology Frame Inspection The metrology frame, sitting on one TMT fixed frame, is being tested using advanced metrology system (pictured on the right) at TMT’s technical lab in Monrovia, April 2020.
The TMT Enclosure System is a dome structure housing the telescope. The three principal enclosure moving components are the rotating base, cap and shutter structures. Combined rotation of the rotating base and cap provides a range of required azimuth and zenith angles. The shutter is a rotating structure enabling opening and closing of the telescope aperture.
The TMT design utilizes a calotte-style enclosure, which minimizes the size and footprint of the facility, while allowing full movement of the telescope and optical systems.
Fabricated by TMT-Japan, MSIT recreates a subset – approximately 1/70th - of the TMT primary mirror cell, and the segments it carries accurately recreate the unique hexagonal forms of the seven segments that will exist in the telescope in the same positions. Mirror segments in TMT are of 82 types – each one very slightly different – arranged in six identical sectors. MSIT contains segments from sectors D and E of the primary mirror.
Left to right: Bryan Smith (Quality Assurance and Testing Engineer), Alastair Heptonstall (Senior Opto-mechanical Engineer), Chris Carter (Telescope Controls Engineer), Alan Tubb (Associate Opto-mechanical Engineer), Ben Gallagher (M1 System Lead Engineer) and Nikhil Naik (Production Support Manager).
From left to right: A CLEARCERAM®-Z zero thermal-expansion glass mirror blank cast by OHARA Inc. in Japan, a prototype of TMT Primary Mirror Assembly, and a spherical glass precisely grinded by Okamoto Optics in Yokohama. Exhibits were featured at the Optics and Photonics International Exhibition, 25-27 April 2018 in Yokohama, Japan.
From Left: Tatsuki Endo (TMT-Japan), Janani Varadhachari (ITCC), Shuji Samizo (Nippon Express) and Nikhil Naik (ITCC)
All delivered TMT blanks are stored in India TMT Optics Fabrication Facility (ITOFF) inspection area, at IIA Crest Campus, Bengaluru.