Telescope & Site perturbations:=
 6 DoF rigid body misalignment of M1M3 (as a single body), M2, and the C=
amera due to fabrication and installation errors after initial (not AOS) al=
ignment
 The rigid bod=
y 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 Document1187. Results are =
summarized in the table on page 19. (use the section with Number of Points =
=3D 10).
 We assume the=
se rigid body misalignments to be Gaussians centered at zero, with standard=
deviations half of the numbers given in the above document.
 6 DoF rigid body gravitational displacements of M1M3 (as a single body)=
, M2, and the Camera, and the residuals of these displacements after open l=
oop (LookupTable) corrections, as a function of zenith angle.
 M1M3 and M2 gravitational shape errors and their residuals after open l=
oop (LookupTable) and Force Balance corrections, as a function of zenith =
angle
 M1M3 zenith and horizon pointing print through map (05/2014)
 Data is given in Document16407.
 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 Document16408.<=
/li>
 M2 zenith and horizon pointing print through map
 Document1486=
5 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 zen=
ith and horizon print throughs in meter.
 M1M3 and M2 polishing errors (constant shape errors due to fabrication)=
 M1M3 fabrication errors in terms of M3 piston, decenter, and tilt relat=
ive to M1.
 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.
Temperature and temperature distribution h=
istories and/or statistics for the air inside the dome, as well as for the =
various components of the system: structure, glass, camera skin.
 6 DoF rigid body displacements and shape distortions of M1M3 and M2 due=
to temperature changes and uneven temperature distributions (the effec=
ts 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 coordina=
tes; Columns 37 are: surface deformation in unit of micron due to 1C chang=
e in bulk temperature (3), radial temperature gradient (4), x temperature g=
radient (5), y temperature gradient (6), and z temperature gradient (7).
 Data provided by Doug Neil.
 M2 shape distortions due to temperature change and temperature gradient=
s (08/2013)
 Document1486=
5 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.
 Residual M1M3 thermal deformation after thermal control corrections.
Camera perturbations:
On 8/2/13, Andy Rasmussen collected some camera FEA related data and com=
piled them into this fits table: output_fitstable.fits
Andy's notes are here.<=
/p>
The units are millimeter.
On 8/6/14, Andy provided the surface deformation data on FEA grids (see =
below). Andy's notes are here.
 6 DoF rigid body misalignment of L1, L2, L3, and the Filters due to fabrication and installation erro=
rs.
 6 DoF rigid body displacements of L1, L2, L3, and the Filters as a func=
tion of
 zenith angle and camera ro=
tation angle
 camera soak temperature
 L1, L2, L3, and Filter figuring errors (constant shape errors due to fa=
brication)
 L1,L2,L3, and Filter gravitational shape errors as a function of
 zenith angle and camera rotation angle (seem to be negligible)
 See the fits table&=
nbsp;above.
 Data on FEA grid also available:
 camera soak temperature
 See the fits table&=
nbsp;above.
 Data on FEA grid also available:
 Overall detector plane 6 DoF rigid body misalignment and displacement d=
ue to
 fabrication and installation errors (seem to be negligible)
 gravitational effects as a function of zenith angle (seem to be negligi=
ble)
 gravitational effects as a function of camera rotation angle
 thermal effects (detector plane thermal motions)
 Overall detector shape errors due to
 gravitational effects as a function of zenith angle (seem to be negligi=
ble)
 gravitational effects as a function of camera rotation angle
 thermal effects (detector plane thermal motions)
 Rafts 6 DoF rigid body misalignment and displacements due to
 fabrication and installation errors (sensor profile/height and raft mou=
nting zposition repeatability, albeit current estimates for the later one =
seem to be small)
 gravitational effect as a function of zenith angle (seems to be neg=
ligible)
 thermal effects (seem to be negligible)
 Raft shape errors due to
 fabrication/polishing errors (seem to be negligible)
 gravitational effect as a function of zenith angle (seems to be neg=
ligible)
 thermal effects (sensor package distortion due to cool down)
 =E2=80=9CPSF=E2=80=9D broadening due to charge diffusion and C=
TE in the CCD and their idiosyncrasies
 Internal thermal seeing in the form of long exposure (15 seconds) O=
PD or PSF, as the function of zenith angle
 Temperature and temperature distribution histories and/or statistics fo=
r the air inside the camera, as well as for the various components of the s=
ystem: structure and glass.
 6 DoF rigid body displacements and shape distortions of L1, L2, L3, and=
the Filters due to uneven temperature distributions.
Operational Parameters:
 Altitude histogram from a representative 10 year run (08/2013)
 Raw data provided by Srini (OpSim 3.61).
 Binned by Bo into 90 bins. Note that =
altitude angle =3D 90 degree  zenith angle.
 Summit temperature variations (08/2013)
 The night temperature on Cerro Pachon rarely gets above 16C or below 2C=
. (provided by Chuck, page 8 of AOS review document)
 We assume the temperature is Gaussian distributed and use (2C, 16C) as =
the (2sigma, 2sigma) bounds.
we expect the M1M3 thermal control system to control the thermal gra=
dients in the M1M3 mirror substrate to within 0.4C in x and y lateral direc=
tions, and 0.1C in radial and axial directions. (05/2009)
 Page 8 of Document7574.
 We assume the thermal gradients to be Gaussian distributed, with (2sig=
ma, 2sigma) ranges covering (T/2, T/2), where T is 0.4C or 0.1C (see above=
).
 Camera rotation angle is assumed to be a uniform distribution between =
90 and 90 degrees
Mirror Bending Modes:
 M1M3 bending modes (07/2014)
 data in ASCII format. 1st two columns are x and y coordinat=
es of the FEA nodes. Unit is meter. The coordinate system is the same as th=
e LSST Optical Coordinate System (OCRS), i.e., x is along the elevation bea=
ring; when telescope is pointed at horizon, y points up, and z points towar=
d the sky. Col. 3  22 are first 20 M1M3 bending modes in meter. These are =
surface sag with 156 axial actuators. The pistontiptilt on the mirror sur=
face has been kept. Details on how the bending modes are obtained can be fo=
und in =
Document16390.
 M2 bending modes (07/2014)

 data in ASCII format. 1st two columns are x and y coordinates o=
f the FEA nodes. Unit is meter. The coordinate system is the same as the LS=
ST Optical Coordinate System (OCRS). Note that when M2 faces down, positive=
z points up. Col. 3  22 are first 20 M2 bending modes in meter. These are=
surface sag with 72 axial actuators. The pistontiptilt on the mirror sur=
face has been removed. These will be updated as we have information on the =
asbuilt mirror.
=_Part_8646_1201071573.1590844054225