Page History

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1. 6 DoF rigid body misalignment of M1M3 (as a single body), M2, and the Camera due to fabrication and installation errors after initial (not AOS) alignment
   • The rigid body displacements due to all sources (including gravity and temperature) will be within the accuracy of the laser tracker (LT). A study on the accuracy of the laser tracker was reported in Document-1187. Results are summarized in the table on page 19. (use the section with Number of Points = 10).
   • We assume these rigid body misalignments to be Gaussians centered at zero, with standard deviations half of the numbers given in the above document.
2. 6 DoF rigid body gravitational displacements of M1M3 (as a single body), M2, and the Camera, and the residuals of these displacements after open loop (Look-up-Table) corrections, as a function of zenith angle.
   • see 1. above
3. M1M3 and M2 gravitational shape errors and their residuals after open loop (Look-up-Table) and Force Balance corrections, as a function of zenith angle
   1. M1M3 zenith and horizon pointing print through map (05/2014)
      • Data is given in Document-16407.
      • The first two columns are the x- and y- coordinates of the FEA nodes in meter. The third and fourth columns are the surface sag for the zenith and horizon print throughs in nanometer.
      • Details on how data is obtained and how to use it is in Document-16408.
   2. M2 zenith and horizon pointing print through map
      • Document-14865 by Myung.
      • Data is in the following sheet of the Excel file:
        • Gravity(Zen&Hor): First 2 columns are x and y of the surface nodes in meter. The third and fourth columns are the surface sag for the zenith and horizon print throughs in meter.
4. M1M3 and M2 polishing errors (constant shape errors due to fabrication)
5. M1M3 fabrication errors in terms of M3 piston, decenter, and tilt relative to M1.
6. An estimate for dome and mirror seeing in the form of long exposure (15 seconds) OPD or PSF as the function of zenith angle, external wind speed, and air temperature.

7. Temperature and temperature distribution histories and/or statistics for the air inside the dome, as well as for the various components of the system: structure, glass, camera skin.

8. 6 DoF rigid body displacements and shape distortions of M1M3 and M2 due to temperature changes and uneven temperature distributions (the effects on M2 may be negligible)
   • For the rigid body DOFs, see 1. above.
   • M1M3 shape distortions due to temperature change and temperature gradients (08/2013)
     • First 2 columns are x and y of the surface nodes in normalized coordinates; Columns 3-7 are: surface deformation in unit of micron due to 1C change in bulk temperature (3), radial temperature gradient (4), x temperature gradient (5), y temperature gradient (6), and z temperature gradient (7).
     • Data provided by Doug Neil.
   • M2 shape distortions due to temperature change and temperature gradients (08/2013)
     • Document-14865 by Myung.
     • Data is in the following sheets of the Excel file:
       
       • Tz&Tz_ao: First 2 columns are x and y of the surface nodes in meter. The third and fourth columns are the surface shape changes due to 1C axial (z direction) thermal gradient in meter. Third column is without aO correction. The fourth column with aO correction.
       • Tr&Tr_ao: First 2 columns are x and y of the surface nodes in meter. The third and fourth columns are the surface shape changes due to 1C radial (r direction) thermal gradient in meter. Third column is without aO correction. The fourth column with aO correction.
9. Residual M1M3 thermal deformation after thermal control corrections.

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