== P1.8 	[[span(style=color: green, **Complete system functional verification, filter artifacts/defects verification, NCPA measurement, and internal tip-tilt loop verification** )]]   == 

- **Phase**		:	1  
- **Status**		: 	[[span(style=color: green, **COMPLETE** )]]  
- **Category**	: 	Unpack, Assemble, and Verification (C1)
- **Recurrence**	: 	once
- **Duration**	: 	1.5 days

**Description**
- Checking the working of motors and light sources within SHARK-NIR using optical feedback. Finding the filter defects/artifacts using an internal calibration source (flat-field) within the instrument. Measure the NCPA internal to the SHARK-NIR and correct using the ALPAO-DM. Check the working of the internal tip-tilt loop using calibration unit light sources, C-RED2, and ALPAO-DM.

**Prerequisites**
- SHARK-NIR is connected to the LBT network.
- Electronics racks on.
- DM best shape uploaded (shape minimizing internal aberrations)
- The cryostat should be running and cooled down.
- P1.7 should be completed.

**Procedure**
- When the services are up and running, after the motors are sent to home positions, each of the individual motors is individually tested for their different named/nominal positions. 
- The light sources within SHARK-NIR are used simultaneously to check the working of the motors by looking at the optical feedback.
- Check the CRED-2 and ALPAO-DM SW using optical feedback.
- Take the images of all the filters using the internal calibration source (flat-field) within the instrument to locate/find out the filter defects/artifacts, if any. You may take short- and long exposures to get better contrast of the features if required.
- Check the filter wheel position monitoring script detailed in [wiki:/docs/Commissioning/SNM1 SNM1]. Save the data in the repository.
Run the Phase-diversity routine using the images taken with the SHARK-NIR internal calibration sources to measure the NCPA within (excluding the deployable arm).
- Run the internal tip-tilt loop routine for a defined (or set of) brightness of the source (star).
- Check its efficiency in keeping the PSF at the C-RED2 hot-pixel.
- Save data to the repository and analyze them.

**Templates**
- SHARKNIR_ci_mon_LyotMaskPos (not released)
- SHARKNIR_di_mon_MaskRepeatability (not released)
- SHARKNIR_di_cal_NCPA (not released)
- SHARKNIR_gen_tiptilt_loop (not released)

**Success criteria**
- All the motors can reach the named positions / nominal positions.
- All the light sources are working and confirmed through optical feedback at the SCICAM.
- Filter wheel position monitoring script is run successfully and data is saved in the repository.
- CRED-2 AND ALPAO-DM working normally.
- All the filter images are saved.
- Internal NCPA is measured and the PSF shows improvement in its quality after the NCPA correction using the ALPAO DM.
- Internal tip-tilt routine works fine and the PSF at the C-RED2 is stable within the required precision.
- All the data and analysis are saved in the repository -  [[span(style=color: green, **Completed. The data can be found in this **)]] [https://drive.google.com/drive/u/0/folders/1Zbq56b6NPvBcq20-sF-qxm4yA4SXdXiF link].


**Notes**

**LBTO support**
- Liquid Nitrogen refill is required in the cleanroom.

**Date performed and by whom**
Elena, Luca