1. Blanco F/8 Status
AURA Observatory Council, Tucson, 3/2013

2. Blanco F/8 Status Preliminary Optics Testing Progress
Initial sequence of tests after repair completed, a couple of additional tests pending
Initial analysis shows figure is essentially the same as in one can see the same features and the same level of figure error
~0.25 waves P-V (99%)
~0.03 waves RMS
~0.1 wave astigmatism
Higher level of astigmatism seen in September has been removed by the repair – stress relief of some sort?
Written report will be produced on completion of optics tests
Roberto Tighe will review
Additional tests, if requested, will be performed
Start making shipping arrangements
AURA Observatory Council, Tucson, 3/2013

3. Blanco F/8 Status Blanco f/8 Secondary at 0 deg. minus Test Optics
PV = 157 nm RMS = 19 nm
AURA Observatory Council, Tucson, 3/2013

4. Blanco F/8 Status Preparations in La Serena
New mirror-handling cart complete (shown with cell installed, missing internal components obviously)
Much safer design, reviewed by non-involved staff & external experts
Gear drive for cart shown before installation
AURA Observatory Council, Tucson, 3/2013

5. Blanco F/8 Status Preparations in La Serena
Mechanical fabrication of drive assemblies complete, fit-check and assembly underway (above); software and electronics also on-track for bench testing
AURA Observatory Council, Tucson, 3/2013

6. Blanco F/8 Status
So far, everything is on track for first installation exercise on telescope starting late June
Dummy mirror only; first test of handling fixtures and procedures
Second run = first tests with repaired mirror, starts mid-August (TBC)
Contingency time planned for October bright run
Re-commissioning of Cass instrument suite follows (initial work is all with ISPI)
AURA Observatory Council, Tucson, 3/2013

7. Blanco F/8 Status – details on optical analysis
AURA Observatory Council, Tucson, 3/2013

8. Blanco F/8 Status
The composite wavefront maps with the rotating Blanco f/8 (M) and Hindle + fold flat (TO)
are averaged to produce the Test Optics Average at 0° (Hindle sphere + fold flat)
(the non-rotationally
symmetric errors on
the Blanco f/8 are
averaged out)
AURA Observatory Council, Tucson, 3/2013

9. Blanco F/8 Status
The composite wavefront maps (rotating Blanco f/8 (M) and stationary Test Optics (TO))
minus
yields
AURA Observatory Council, Tucson, 3/2013

10. Blanco F/8 Status
Note the fine scale features rotate clockwise with the secondary, M.
Rotate M to 0°
Note the fold flat support (indicating gravity) rotates counterclockwise and the fine scale features on the secondary do not. data are then
averaged to produce the Blanco f/8 Secondary at 0°.
PV = 157 nm
RMS = 19 nm
AURA Observatory Council, Tucson, 3/2013