This webpage contains the optical documents which connected to the cleaning procedures, the reflectivity measurements, the optical alignment and the safety issues.

Optical documents

Cleaning

• Washing the WHT primary

• Snow (CO2) cleaning procedure

• FAQ on CO2 cleaning from AST

• Vapour washing

• Optical maintenance

• Mirror maintenance (link to Ops webpage)

• Cleaning optical components

• Cleaning and handling optical parts

• Stock items for optical cleaning

Measuring

• Reflectivity results

• SMS μscan reflectivitymeter

• Notes on the data

Safety

• Laser goggles' and lasers' specification

Nasmyth focal stations and de-rotators at WHT

• Nasmyth focal stations (pdf)   
  - information on focal distances positions in GRACE and GHRIL with and without de-rotators

• Derotators at WHT (pdf) - OPT-WHT-001.pdf
  - information on available de-rotators at the WHT