Finite Element Analysis perturbation files for Rubin Observatory Simonyi Survey Telescope and LSST Camera

## Notes on FEA files

# M1M3 Bending modes

M1M3_1um_156_grid.fits.gz

- source = IM/data/M1M3/M1M3_1um_156_grid.txt

- shape = (5256, 159)

- Each row is one of 5256 FEA nodes.

- 0th column is M1M3 disambiguator

- 1st and 2nd columns are FEA node x and y in M1M3 CS

- Last 156 columns are bending modes; the z-displacement of each node for each mode.

M1M3_1um_156_force.fits.gz

- source = IM/data/M1M3/M1M3_1um_156_force.txt

- shape = (156, 159)

- Each row is one of 156 bending modes.

- 0th column is actuator ID

- 1st and 2nd columns are actuator x and y in M1M3 CS

- Last 156 columns are forces in Newtons for each mode.

# M1M3 print through

M1M3_dxdydz_zenith.fits.gz

- source = IM/data/M1M3/M1M3_dxdydz_zenith.npy

- shape = (5256, 3)

- Each row is one of 5256 FEA nodes.

- Columns are dx, dy, dz in M1M3 CS.

- This is the gravitational "print through" when mirror is zenith pointing

M1M3_dxdydz_horizon.fits.gz

- source = IM/data/M1M3/M1M3_dxdydz_horizon.npy

- shape = (5256, 3)

- Each row is one of 5256 FEA nodes.

- Columns are dx, dy, dz in M1M3 CS.

- This is the gravitational "print through" when mirror is horizon pointing

M1M3_force_zenith.fits.gz

- source = IM/data/M1M3/M1M3_force_zenith.npy

- shape = (256,)

- Each row is one of 256 actuators. (So we consider the x and y actuators here too.)

- Columns are forces in Newtons.

- These are the mirror support forces when the mirror is zenith pointing. (Is this after optimization? Include LUT or not?)

M1M3_force_horizon.fits.gz

- source = IM/data/M1M3/M1M3_force_horizon.npy

- shape = (256,)

- Each row is one of 256 actuators. (So we consider the x and y actuators here too.)

- Columns are forces in Newtons.

- These are the mirror support forces when the mirror is horizon pointing. (Is this after optimization? Include LUT or not?)

# M1M3 Thermal

M1M3_thermal_FEA.fits.gz

- source = IM/data/M1M3/M1M3_thermal_FEA.npy

- shape = (5244, 7)

- Each row is one of 5244 FEA nodes. (Why aren't these the same as above? I don't know.)

- Columns are:

- 0: Unit-Normalized FEA x

- 1: Unit-Normalized FEA y

- 2: Bulk temperature dz coefficient

- 3: x temperature gradient dz coefficient

- 3: y temperature gradient dz coefficient

- 3: z temperature gradient dz coefficient

- 3: r temperature gradient dz coefficient

# M1M3 Miscellany

M1M3_influence_256.fits.gz

- source = IM/data/M1M3/M1M3_influence_256.npy

- shape = (5256, 256)

- Each row is one of 5256 FEA nodes.

- Each column is one of 256 actuators.

- Values are dz/dF for each actuator/node.

M1M3_LUT.fits.gz

- source = IM/data/M1M3/M1M3_LUT.txt

- shape = (257, 91)

- First column is index in degrees (0-90 inclusive). Last 256 columns are forces in Newtons.

- Each column is LUT for one value of the elevation index.

M1M3_1000N_UL_shape_156.fits.gz

- source = IM/data/M1M3/M1M3_1000N_UL_shape_156.npy

- shape = (5256, 156)

- Rows must be FEA nodes, columns must be bending modes.

- Not sure what the purpose is of this one.

# M2 Bending modes

M2_1um_grid.fits.gz

- source = IM/data/M2/M2_1um_grid.DAT

- shape = (15984, 75)

- Each row is one of 15984 FEA nodes.

- 0th column is node index ?

- 1st and 2nd columns are FEA node x and y in M2 CS

- Last 72 columns are bending modes; the z-displacement of each node for each mode.

M2_1um_force.fits.gz

- source = IM/data/M2/M2_1um_force.DAT

- shape = (72, 75)

- Each row is one of 72 bending modes.

- 0th column is actuator ID

- 1st and 2nd columns are actuator x and y in M2 CS

- Last 72 columns are forces in Newtons for each mode.

# M2 print through / thermal

M2_GT_FEA.fits.gz

- source = IM/data/M2/M2_GT_FEA.txt

- shape = (9084, 6)

- Each row is one of 9084 FEA nodes. (Why aren't these the same as above? I don't know.)

- Columns are:

- 0: Unit-Normalized FEA x

- 1: Unit-Normalized FEA y

- 2: Zenith print through dz coefficient

- 3: Horizon print through dz coefficient

- 4: z temperature gradient dz coefficient

- 5: r temperature gradient dz coefficient