P3.9 NCPA working and performance & checking for pupil shifts

• Phase : 3
• Status : Draft
• Category : Nighttime testing (functionality and operability) (C5) + Nighttime testing for performance (C7)
• Recurrence : once at commissioning
• Duration : 3 nights

Description

• Evaluate the NCPA working and performance using the baseline approach, phase-diversity approach using the Wollaston prism & dual-band imaging, and measurement of NCPA using SHARK-NIR internal calibration sources.

Prerequisites

• Atmospheric conditions: TBD
• Authorize SHARK-NIR on the SX side.
• AO is working.
• Target(s) at different Zenith distances with different magnitudes.
• lookup tables of already calibrated NCPA measurements.

Procedure

• Acquire a star of a given magnitude, start SOUL-AO, followed by the internal-TT loop.
• Check the working and performance of the NCPA (already calibrated) baseline approach. Take images at SCICAM.
• Check the phase diversity NCPA approach using Wollaston prism + DI-DBI (already calibrated). Take images at SCICAM.
• If the PSF after applying the calibrated NCPA is bad, we could close the SHARK-NIR shutter (can have the SOUL-AO running parallel) and do a quick internal NCPA measurement (either till the NCPA modal coefficients or until the new shape on ALPAO-DM) to confirm that the alignment of SHARK-NIR is still good. This would mean that the NCPA already calibrated is not good enough!
• Measure the phase diversity NCPA approach using Wollaston prism + DI-DBI and using real star (need to do on the spot, but script exists). Take images at SCICAM.
• Check the pupil position by inserting the pupil lens.
• Repeat for a different star (of various magnitudes and for a different telescope elevation). It is also good to do this for other seeing conditions.

Templates

• SHARKNIR_di_cal_NCPA (not released)

Success criteria

• NCPA estimated and applied on the ASM / ALPAO DM.
• Cross-check the NCPA performances with the daytime activity P2.6.
• The total residual after NCPA correction should be <30nm.

Notes

LBTO support

• AO support

Date performed and by whom

comment

• perform for 5 cases e.g. Rmag 8, 10, 10, 12, 14. These five cases where the star has different mag and at different zenith angles over different nights (so different seeing).