Changes between Version 17 and Version 18 of docs/CommissioningPlan/P2.9

Timestamp:

09/26/22 11:34:27 (2 years ago)

Author:

dvassall

Comment:

--

docs/CommissioningPlan/P2.9

@@ -8 +8 @@
 
 **Description**
-- 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. 
+- This calibration is performed to calibrate the center of the target star (hidden by the coronagraph) in order to provide a reference input for frame derotation to be performed in post-processing.
 
 **Prerequisites**
@@ -15 +15 @@
 **Procedure**
 - TBW+TBC
-- DM (ASM/ALPAO-DM?) produces a pattern offset with four spots symmetric with respect to the star + AO closed-loop + coronagraph
-- 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.
-- 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.
+- Offset of the ASM generating multiple satellite spots in the focal plane + AO closed-loop + coronagraph
+- The required specifications of the corresponding image are the presence of at least 4 satellite spots placed symmetrically with respect to the star, at separation within 5 and 15 lambda/D, with FWHM < 45 mas and separation precision < 6 mas.
+- Either KL#62 or KL#119 is applied to the ASM on target acquisition to generate the satellite spots. Find the centroids of the spots and fit a circle to them. The center of the circle is the extrapolated star position behind the coronagraph.
 
 **Templates**
@@ -23 +23 @@
 
 **Success criteria**
-- Accuracy of 3 mas (goal 1 mas) 
+- Accuracy < 10 mas (goal 5 mas) 
 
 **Notes**