P3.2 Telescope control – checking focus for different wavelengths

• Phase : 3
• Status : Draft
• Category : Nighttime testing (functionality and operability) (C4)
• Recurrence : once at commissioning
• Duration : 30 minutes

Description

• Focus the telescope and check for chromatic variations (using different filters).

Prerequisites

• Atmospheric conditions: should be able to see bight stars on the sky (preferably close to zenith?).
• Authorize SHARK-NIR on the SX side.
• Chose a star/field (or set of stars) which have emissions in all the required wavelengths to be checked.

Procedure

• Send the preset of the selected target.
• Focus the star for a given filter. If needed reduce the aberrations by changing/moving M2.
• Check if the same focus is good for other filters as well.

Success criteria

• No unexpected chromatic focus behaviour.

Notes LBTO support Associated SHARK-NIR personnel

• JF, LM, MdP, MM (from AZ)

Date performed and by whom