P2.6 Tip-Tilt internal fast loop test with ASM turbulence

• Phase : 2
• Status : Draft
• Category : Daytime testing (functionality and operability) (C3)
• Recurrence : after instrument installation at telescope platform
• Duration : 0.5 day

Description

• To verify the SHARK-NIR internal fast tip-tilt loop (using CRED1 and SHARK-NIR ALPAO DM) using the ARGOS light source (only at zenith) for various seeing conditions simulated at the ASM. This test will verify if the correction of the fast tip-tilt loop is affected by residual of the turbulence, for star different magnitudes.

Prerequisites

• Knowledge of Argos light source magnitude and the possibility to tune its brightness.

Procedure

• Use ARGOS light source (to be used only at zenith) and direct light towards SHARK-NIR.
• Close the SOUL AO loop to have the best ASM shape. Keep the ASM static with the best shape.
• Close the SHARK-NIR internal tip-tilt loop.
• Take 10mins of data at the CRED2 and SCICAM.
• Introduce 0.5" seeing at the ASM and close the loop.
• Close the SHARK-NIR internal tip-tilt loop.
• Take 10mins of data at the CRED2 and SCICAM.
• Introduce 0.8" seeing at the ASM and close the loop.
• Close the SHARK-NIR internal tip-tilt loop.
• Take 10mins of data at the CRED2 and SCICAM.
• Repeat the above steps for the selected brightness of the Argos light source

Templates

Success criteria

• SHARK-NIR fast tip-tilt loop working efficiently within the requirements in all the seeing conditions.

Notes

• For the SN team: know in advance how many minutes of data can be downloaded from CRED2 or the ring-buffer size.

LBTO support

• Authorize SHARK-NIR
• Permission to use SX-ASM and LBTI-AO
• AO support

Date performed and by whom