P2.6 Measurement of NCPA

• Phase : 2
• Status : Draft
• Category : Daytime calibration (C3)
• Recurrence : after instrument installation at telescope platform
• Duration : 3 hour(s)

Description

• Measure the Non-Common Path Aberrations (NCPA).

Prerequisites

• RR mounted and SHARK-NIR aligned to telescope.

Procedure

• In closed-loop, we optimize the PSF shape on SCICAM using the trial & error algorithm used by LBTO team during LUCI calibrations changing M2 reference shape applying modes coefficients.
• We also perform the phase-diversity tests using the same light source and look at the NCPA output produced.
• Depending on the two results and the quality of PSF, we may choose one or the other or the combination of both.
• Note that we may do this for different elevation angles.

Success criteria

• NCPA estimated and applied on the ASM? (how often we do this? Every night?
• Satisfactory PSF quality with closed-loop and get a new and improved daytime telescope model for SHARK-NIR?

Notes

• See activity 8.1 in AD4 for more details.

LBTO support

• Mount the RR on SX
• Support from LBTI?

Associated SHARK-NIR personnel

• JF, LM, MdP, MM (from AZ)

Date performed and by whom