TMT Construction Proposal - Thirty Meter Telescope

Fig 7-8: Current enclosure and summit facility layout on Armazones. .......................................................58
Fig 7-9: Control architecture for adaptive optics observations....................................................................61
Fig 7-10: OES command hierarchy.............................................................................................................62
Fig 7-11: NFIRAOS Strehl ratio as a function of wavelength......................................................................66
Fig 7-12: Cumulative probability distribution of gravity induced segment shape aberrations (left) and the
zenith angle dependence of these aberrations (right). ...............................................................................69
Fig 7-13: Cumulative probability distribution of wind induced dynamic aberrations (left) and median wind
induced image degradation as a function of zenith angle (right). ...............................................................70
Fig 7-14: Cumulative probability distributions for mirror and dome seeing (left) and combined median
thermal seeing as a function of zenith angle (right). ...................................................................................71
Fig 7-15: Cumulative probability distribution for overall image size (left) and zenith angle dependence of
the 25, 50, and 75 percentile image size (right)..........................................................................................72
Fig 7-16: Median wind induced image degradation and local thermal seeing as functions of the external
mean wind velocity estimate. ......................................................................................................................72
Fig 7-17: D 80 conditional probability density function as a contour plot, compared to the zenith dependent
error budget.................................................................................................................................................72
Fig 7-18: Reliability block diagram of the observatory. ...............................................................................73
Fig 8-1: Location of proposed new access road. ........................................................................................76
Fig 8-2: Conceptual layout of the Main Summit Facilities...........................................................................79
Fig 8-3: Conceptual layout of Support Facilities with areas of rooms.........................................................80
Fig 8-4: Enclosure Cross-Section. ..............................................................................................................81
Fig 8-5: Enclosure Systems. .......................................................................................................................81
Fig 8-6: FE Model of the TMT enclosure. ...................................................................................................82
Fig 8-7: Azimuth Bogie Installation. ............................................................................................................83
Fig 8-8: Cap / Base Interface Detail............................................................................................................83
Fig 8-9: TMT Enclosure Shutter..................................................................................................................84
Fig 8-10: TMT Enclosure Vents (Shown Open)..........................................................................................84
Fig 8-11: Telescope Structure System........................................................................................................86
Fig 8-12: Elevation Structure Components.................................................................................................86
Fig 8-13: Azimuth Structure Components...................................................................................................87
Fig 8-14: Examples of Requirements Flow-Down. .....................................................................................88
Fig 8-15: Structural Placement for Light Path Considerations - M3 to Nasmyth Platform.........................88
Fig 8-16: Structural Placement for Light Path Considerations – M1...........................................................89
Fig 8-17: Conceptual layout of access infrastructure for the final instrument locations. ............................90
Fig 8-18: Azimuth Axis Mount Control Hardware – Split View....................................................................91
Fig 8-19: Hexagonal pattern for the TMT primary mirror. ...........................................................................94
Fig 8-20: The M1 segments, SSAs and mirror cell, viewed from below. ...................................................96
Fig 8-21: Schematic of the SSA design. .....................................................................................................96
Fig 8-22: Conceptual design of the SSA.....................................................................................................96
Fig 8-23: A PSA and its neighbors, shown from below..............................................................................97
Fig 8-24: Configuration of Secondary Mirror Assembly. ............................................................................99
Fig 8-25: M2 Cell Assembly. .....................................................................................................................101
Fig 8-26: M2 Axial support print-through..................................................................................................102
Fig 8-27: M2 Lateral support print-through ..............................................................................................102
Fig 8-28: Illustration of the hexapod geometry.........................................................................................102
Fig 8-29: Tertiary Mirror (M3) Assembly. ..................................................................................................103
Fig 8-30: Print-through of the M3 supports for three orthogonal gravity directions. .................................106
Fig 8-31: An illustration showing the functional relationships between the various systems that fall under
Telescope Controls. ..................................................................................................................................110
Fig 8-32: M1CS functional block diagram .................................................................................................114
Fig 8-33: An illustration of the PSA, Sub-cell, and top layer of the mirror cell..........................................114
Fig 8-34: A cross section view or the TMT edge sensor showing critical dimensions in millimeters.......115
Fig 8-35: The top figure illustrates the actuator tracking error at a track rate of 270 nm/sec. .................116
Fig 8-36: Residual in-plane error multipliers for Keck and TMT are shown.............................................117
Fig 8-37: Comparison of measured and simulated P1 sensor data for relative height displacements....117
Fig 8-38: A comparison of the residual out-of-plane error multipliers for Keck and TMT. .......................118
TMT Construction Proposal
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