P2.9 Nighttime acquisition and setting telescope collimation for night (this page will change completely)

• Phase : 2
• Status : Draft
• Category : Nighttime testing (functionality and operability) (C4)
• Recurrence : after instrument installation at telescope platform
• Duration : 3 hour(s)

Description

• A bright enough on-axis star is acquired with SHARK-NIR, to define the offset to issue to the telescope for a successful pointing. Telescope collimation model is optimized for the night, if necessary.

Prerequisites

• Atmospheric conditions: should be able to see bight stars on the sky (preferably close to zenith?)

Procedure

• Authorize SHARK-NIR on the SX side.
• Point to bright star on the sky and acquire. Once the star is at the reference pixel of the SCICAM, record the nighttime telescope collimation model for SHARK NIR.
• Close the loop at least with low order to save the flat for the ASM.
• If needed, run again the NCPA estimation and record the flat again.
• Go to another bright star in the field to see if the star appears immediately in the FoV of SHARK-NIR. If needed, correct the offset and record new collimation. Iterate this with another star to cross-check again.
• If time allows, perform NCPA within SHARK (using the phase-diversity method) and check the working the residual tip-tilt loop+NCPA at the ALPAO DM.
• Save telemetry (open and closed loop of the ALPAO DM).

Success criteria

• First-ever ‘technical photons’ at the SHARK-NIR WFS and SCICAM.
• Nighttime collimation model of the SHARK-NIR is recorded.
• Satisfactory PSF quality with closed loop.
• Telemetry saved (open and closed loop of ALPAO DM) for Phase diversity NCPA estimation.

Notes LBTO support

• Support from LBTI/LBTO?
• Presence of John Hill usually helps while collimating for the first time.
• Steve Allenson (as the TO) will be a great asset too.

Associated SHARK-NIR personnel

• JF, LM, MdP, MM (from AZ), DV?

Date performed and by whom