Technical Meeting #6: Optical layout for CoDR
This meeting took place at 14:00 on Thursday 3rd June. Attendees: JSY, MF, ADR, XS, CAH, DMAW, EBS
Agenda
- Impacts of coupling component mounts together (e.g. on a common baseplate)
- With reference to error budgets
- Need for flat folding mirrors
- What factors drive this?
- Selection of layouts and error budgets to present at CoDR
- Variations on selected layouts to present at CoDR (e.g. "telephoto" lens arrangement)
Selected Layouts
We have selected the following 3 conceptual layouts to present at CoDR (with error budgets). The drawings below are preliminary - the layouts are to be refined by Alex.
- OAP (reflective, folded)
- Focal length 1600mm, OAP off-axis angle 10 deg
- Dog-leg Transmissive
- Focal length 1525mm
- Zoom Transmissive
- Variation from TechMeet7
- Direct Transmissive
- Focal length 1525mm
Other Conclusions
- Reflective layout now requires a folding mirror; in previous layouts FTT beam is probably occulted by AAS beamsplitter
- OAP off-axis angle ~30 deg is probably ok according to ICOS
- No significant benefits from not respecting AO or future dichroic mount envelopes
- Addition of a negative lens will be considered as a variation on the above layouts
New Tasks
All high priority unless stated.
- ADR: Refine selected layouts
- JSY: Query with NMT:
- AAS envelope
- Space to overhang table
- Clearance above table
- M4 position
- ADR: Tolerancing of direct transmissive layout under table bending
- CAH: Request permission and funding to measure Nasmyth table deformation and temperature gradient at AMOS (during next trip to NMT)