== P3.10	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 working.
•	Target(s) at different Zenith distances with different magnitudes.
* look up tables of already calibrated NCPA measurements.

**Procedure**
•	Acquire star of a given magnitude. Start SOUL-AO. Start 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 inserting the pupil lens.
* Repeat for a different star (of different magnitudes and for a different elevation of the telescope). It is also good to do this for different seeing conditions.

**Success criteria**
• NCPA estimated and applied on the ASM / ALPAO DM.
* Cross-check the NCPA performances with the daytime activity [wiki:/docs/CommissioningPlan/P2.6 P2.6].
* The total residual after NCPA correction should be <30nm.

**Notes**

**LBTO support**
•	AO support

**Associated SHARK-NIR personnel**

**Date performed and by whom**

**comment**
* perform for 5 cases eg 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).