PFS-JIRA https://pfspipe.ipmu.jp/jira This file is an XML representation of an issue en-us 8.3.4 803005 13-09-2019 [PIPE2D-393] Test if variation of Zernike coefficients for term i does itself have a pattern of the ith Zernike polynomial https://pfspipe.ipmu.jp/jira/browse/PIPE2D-393 DRP 2-D Pipeline <p>Based on presentation on Josh Mayers and discussion with Johs Meyers and Aaron Roodman in dm-donut channel (LSST project), the claim is that (A. Roodman): ``I think its a deep optical result that the variation of Zernike coefficients for term i does itself have a pattern of the ith Zernike polynomial. I seem to recall its in the literature, but don’t have this at my fingertips. ''. They attach image of Z9 determined for DECam which looks exactly as Z9.</p> <p>This ticket is to investigate if this is true for PFS</p> PIPE2D-393 Test if variation of Zernike coefficients for term i does itself have a pattern of the ith Zernike polynomial Task Normal Done Done ncaplar ncaplar Thu, 28 Mar 2019 19:04:07 +0000 Thu, 4 Apr 2019 21:43:53 +0000 Thu, 4 Apr 2019 21:43:53 +0000 0 1 <p>Zemax has been busy and it will stay busy this week. I was reassured that it should be free next week. I only managed to get few spots out of Zemax a <span class="image-wrap" style=""><a id="11902_thumb" href="https://pfspipe.ipmu.jp/jira/secure/attachment/11902/11902_Z8.png" title="Z8.png" file-preview-type="image" file-preview-id="11902" file-preview-title="Z8.png"><img src="https://pfspipe.ipmu.jp/jira/secure/thumbnail/11902/_thumb_11902.png" style="border: 0px solid black" /></a></span> It is not obvious to me that the conclusions from optical telescopes apply here. I plan to finish this analysis with more spots so that we can clearly see what is happening next week.</p> <p>As Seen in the attached Figures, it does seem that hypothesis stated in the description of the task is correct. We are looking if we can use this knowledge in further work. In any case, the conclusion of the discussion with R. Lupton and J. Gunn on April 3 is that the way that I was doing until now (fitting 2nd order polynomial in x- and y- direction) is insufficient. We believe that z4, z11, z22 shapes are due to the tilting of the detector. Also we might expect some extra effects due to grating (mainly trefoil).</p> Development Rank 0|zx003c: Reviewers rhl Story Points 2.0