Sandrine's first update

aos_commissioning.tex

@@ -3,27 +3,28 @@ \section{Active Optics System Commissioning}
 
 The commissioning of the Active Optics System (AOS) has marked a significant milestone for the Rubin Observatory, 
 demonstrating the system's readiness to support high-quality imaging. The first images captured with ComCam 
-achieved an impressive 1.7 arcsecond full-width half-maximum (FWHM) image quality, a testament to the exceptional
-work of the engineering and optical teams during assembly and to the optimization of the Look-Up Table (LUT) using 
-laser tracker data at the beginning of 2024. Through rigorous testing, frustration and lots of learning, 
-we have achieved a system capable of delivering sub-arcsecond image quality, 
+achieved an impressive 1.7 arcsecond full-width half-maximum (FWHM) image quality, a testament to the exceptional metrology
+work of the engineering and optical teams during assembly and to the optimization of the Look-Up Table (LUT) for all the active optics components using 
+laser tracker data as well as mirror force balance data throughout 2024. Through rigorous testing, frustration and lots of learning, 
+we have achieved a system capable of delivering sub-arcsecond image quality in good seeing, 
 laying the foundation for the transition to LSSTCam commissioning and the start of survey operations.
 
 \subsection{Initial Alignment}
-The initial alignment of the AOS utilized an updated laser tracker nominal frame, ensuring the system was 
-consistently brought into focus. These refinements simplified the alignment process, demonstrating the 
-value of accurate laser tracker data and paving the way for seamless operations. The laser tracker is now
-capable of delivering a well-aligned system at the start of the night.
+The initial alignment of the AOS utilized an updated laser tracker nominal frame issued from our Final Element Model, ensuring the system was 
+consistently brought into focus. Combined with a thorough measurement of the impact of gravity on the telescope, 
+these refinements simplified the alignment process, demonstrating the 
+value of accurate laser tracker data and paving the way for seamless operations.
+Once we were able to get on-sky images using curvature wavefront sensing, we finalized the optimal hexapods position that would ensure a well aligned system at the start of the night. 
 
 \subsection{Coordinate Systems}
-Throughout commissioning, significant effort was devoted to understanding and refining coordinate systems. 
+During the first few weeks, significant effort was devoted to understanding and refining coordinate systems at different steps of the Active optics closed-loop process (wavefront sensor estimation and correction calculation). We conducted the test by introducing one degree of freedom at a time and correcting for it. 
 We identified a rotation discrepancy in ComCam's installation compared to the expected design, requiring 
 adjustments in our alignment procedures. This experience was useful to prepare for similar challenges 
-with LSSTCam, equipping the AOS team with strategies to handle future discrepancies.
+with LSSTCam, equipping the AOS team with strategies to handle future discrepancies. 
 
 \subsection{Wavefront estimation}
-The wavefront estimator proved robust across diverse observing conditions. 
-On dense fields such as 47 Tuc, the estimator provided accurate results for 
+The wavefront estimator proved robust across diverse observing conditions of seeing, mount elevation and a few filters (r,i and y band) 
+On dense fields such as 47 Tuc or NGC 253, the estimator provided accurate results for 
 all sensors except the central one. Validation against Batoid simulations confirmed 
 the good accuracy of Rubin's ray-tracing software.
 
@@ -44,14 +45,14 @@ \subsection{Closed Loop}
 Consistency in results across nights confirmed the need for further refinement of the LUT.
 
 In favorable seeing conditions, the system achieved sub-arcsecond image 
-quality, with FWHM as low as 0.65 arcseconds. Zernike-based AOS FWHM 
+quality, with FWHM as low as 0.65 arcseconds, with a variation across the field less than 0.1 arcsecond (TBC). Zernike-based AOS FWHM 
 contributions confirmed the system's convergence to exceptional image 
 quality. Autonomous closed-loop operations were run by observers, 
 demonstrating the maturity of the system. Preparations are underway 
 for a fully autonomous survey-mode triplet-taking block before the 
 conclusion of ComCam's on-sky operations.
 
-Tuning the closed-loop gain and making further adjustments to improve computational 
+The process still takes 5min though, requiring 5 or more iterations. Tuning the closed-loop gain and making further adjustments to improve computational 
 efficiency remains a priority for the team.
 
 \subsection{LUT}