== 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 [wiki:/docs/CommissioningPlan/P2.6 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).