P2.9 Flexure tests

• Phase : 2
• Status : Draft
• Category : Daytime testing (functionality and operability) (C2)
• Recurrence : once at commissioning
• Duration : 3 days

Description

• This activity corresponds to the flexure tests for the SHARK-NIR.

Prerequisites

• If relevant, estimate and remove the NCPA using the phase-diversity method.
• RR mounted on SX side.

Procedure

• Test the positions of the various opto-mechanical components within the instrument using optical feedback while moving the telescope in elevation.
• Change the velocity and acceleration of the movement of the telescope in elevation if required.
• Remember to perform the tests for all the observing modes (whatever possible with RR or internal light sources)
• You may want to disentangle the flexure of the RR while moving the telescope in elevation by comparing the optical feedback for the same movement with the internal light source.
• This test will also test the working of the LBTO AO system while the telescope is moving in elevation.
• Compare the results with that of Padova flexure tests.

Success criteria

• All the images and data are saved for analysis or to create the lookup table.

Notes

• If the test results are not satisfactory, this activity may be repeated again after making proper counter measures to reduce the flexure.

LBTO support

• Authorize SHARK-NIR on the SX side.
• RR will be required on the SX side.
• Support from LBT SW Team, LBTI/Arcetri team to run SOUL AO

Associated SHARK-NIR personnel

Date performed and by whom Comments

MB: not sure changing elevation vel and acc is doable, but even if not sure it makes sense. At night we will not be able to control this, so i would say it is betetr to leave the standard parameters [yes, it is possible. i have done it talking to mountain manager for LN.]

MB: concerning RR flexures, from arcetri videocon you need to keep the loop closed while going down, so this might not be optimal for us, as it means mirrors are shifted...let's discuss again [ yeah, need discussion]