Changes between Version 17 and Version 18 of docs/CommissioningPlan/P2.7


Ignore:
Timestamp:
08/26/22 15:19:57 (2 years ago)
Author:
kradhakrishnan
Comment:

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  • docs/CommissioningPlan/P2.7

    v17 v18  
    1  == P2.7        Star center Fourier mode images ==
    2  
     1 == P2.7        SHARK-NIR system-level characterization at different telescope elevations ==
     2
    33- **Phase**             :       2 
    44- **Status**            :       Draft   
    55- **Category**  :       Daytime testing (functionality and operability) (C3) + Daytime calibration (C4)
    66- **Recurrence**        :       once after instrument installation at telescope platform
    7 - **Duration**  :       0.5 day
     7- **Duration**  :       6 days
    88
    99**Description**
    10 - This calibration is performed to calibrate the target star center with respect to the detector in order to provide a reference input for frame derotation and quadrant combination.
     10- SHARK-NIR system-level characterization and optimization as a function of the telescope elevation. Checking the pointing offset between SHARK-NIR, LBTI, and SOUL-AO. SOUL-AO tests. Measure the Non-Common Path Aberrations (NCPA).
    1111
    1212**Prerequisites**
    13 - Authorize SHARK-NIR on the SX side.
    14 - Atmospheric conditions: AO working conditions.
    15 - Bad pixel map, Dark
     13- Use the Argos swing arm / RR mounted on the SX side. SHARK-NIR aligned to telescope.
     14- Phase-diversity algorithm is tested and working in simulation and using real images from the SCICAM (at Padova).
    1615
    17 **Procedure**
    18 - TBW+TBC
    19 - DM (ASM/ALPAO-DM?) produces a pattern offset with four spots symmetric with respect to the star + AO closed-loop + coronagraph
    20 - The required specifications of the corresponding image are a grid of at least 2x2 regularly spaced focal plane image peaks within 5 and 15 lambda/D with FWHM < 45 mas and separation precision < 6 mas.
    21 - DM offset applied on target acquisition to produce a waffle image. Find the center of the four first-order diffraction peaks (cross geometry) to deduce the pixel corresponding to the center field.
     16**Procedure for pointing offset measurements and characterization**
     17- TBW
     18
     19**Procedure for SOUL-AO tests**
     20- TBW
     21
     22**Procedure for NCPA**
     23- Go to a specific elevation of the telescope.
     24- Close the AO loop for the on-axis light source to produce the best PSF at the pin of the pyramid of the SOUL WFS. Keep that shape steady on ASM.
     25- Now, optimize the PSF shape on the SCICAM using the trial & error algorithm. The ALPAO-DM on the SHARK-NIR Bench is used to apply different modes. [Currently, this is the baseline approach].
     26- For the same elevation, keeping the same ASM shape as before and the same source, perform the phase-diversity test (with flat ALPAO-DM), using the Wollaston prism and dual-band imager lens configuration. Apply the obtained NCPA on the ALPAO DM within SHARK. Take SCICAM images to see the improvement. [In case the NCPA produced by the baseline approach is not stable enough for a longer period, and if more correction seems necessary for high contrast, we will be implementing this approach (for which we will be using the star itself as the source during nighttime)].
     27- Note that in the above two cases, the optical path contains the same optics (except for the Wollaston and DBI lens), including the dichroic and IN_TT of the deployable arm.
     28- Repeat these measurements for the decided discreet zenith angles (or elevation of the telescope) and SHARK-NIR DROT angle (fixed).
     29
    2230
    2331**Templates**
    24 - SHARKNIR_gen_cal_StarCenter (not released)
    25 
     32- SHARKNIR_di_cal_NCPA (not released)
     33 
    2634**Success criteria**
    27 - Accuracy of 3 mas (goal 1 mas)
     35- Estimate the pointing offset and conclude if it is acceptable or not. If not acceptable, take proper actions to overcome this issue.
     36- The SOUL-AO system is working in tandem with the SHARK-NIR system.
     37- Acceptable improvement of the on-axis PSF (Argos Swing arm calibration light source) while SOUL AO is closed with known disturbances.
     38- NCPA estimated and applied on the ALPAO-DM.
     39- Satisfactory PSF quality with closed-loop.
     40- The total residual after NCPA correction should be <30nm.
    2841
    2942**Notes**
    30 - Same as activity 7.8 in AD4
     43- See activity 8.1 in AD4 for more details.
    3144
    3245**LBTO support**
    33 - AO support
     46- Authorize SHARK-NIR on the SX side.
     47- Permission to use the Argos Swing Arm.
     48- RR will be required on the SX side when not using the Argos swing arm and for different elevation angle tests.
     49- AO support.
    3450
    3551**Date performed and by whom**