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  1. Data Management
  2. DM-28239

Incorrect layout of corner raft wavefront CCDs in obs_lsst

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      Description

      In v20.0.0, the corner rafts CCDs are laid out like this:

      The guider chips are correct (according to LCA-13381), and the locations of the wavefront CCDs, R44_SW0 and R44_SW1, are correct, but the amps are mis-labeled.

      In v21.0.0, the corner raft layout looks like

      The left-to-right orderings of the amps of the wavefront chips are now not correct, but and R44_SW0 is shifted upwards and R44_SW1 is shifted downwards relative to their nominal positions.  Similar problems are seen for R00, R04, and R40.  These new placements were added in DM-26205.

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          jchiang James Chiang added a comment -

          FWIW, this modification of R44W.yaml places and orients the WF chips in roughly the right places:

            geometryWithinRaft:
              SW0 : {
                offset : [2.5, 21.4375],
                yaw : 180.0
              }
              SW1 : {
                offset : [2.5, -16.4425],
                yaw : 0.0
              }

          Show
          jchiang James Chiang added a comment - FWIW, this modification of R44W.yaml places and orients the WF chips in roughly the right places: geometryWithinRaft: SW0 : { offset : [2.5, 21.4375], yaw : 180.0 } SW1 : { offset : [2.5, -16.4425], yaw : 0.0 }
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          jchiang James Chiang added a comment -

          After checking with Robert Lupton, I confirm that using v21.0.0 does assemble the BOT data correctly.  Here's the Flammarion assembly from August 2020 using v21.0.0 and cameraGeom.showCamera:

          However, when running corner_raft_plot.pyto produce the R44 layout plots, the WF CCD placements are incorrect.   I suppose it's possible there's a bug in this script, but if not, the difference in behavior between that script and .showCamera should be understood.

          Show
          jchiang James Chiang added a comment - After checking with Robert Lupton , I confirm that using v21.0.0 does assemble the BOT data correctly.  Here's the Flammarion assembly from August 2020 using v21.0.0 and cameraGeom.showCamera: However, when running  corner_raft_plot.py to produce the R44 layout plots, the WF CCD placements are incorrect.   I suppose it's possible there's a bug in this script, but if not, the difference in behavior between that script and .showCamera should be understood.

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            Assignee:
            Unassigned Unassigned
            Reporter:
            jchiang James Chiang
            Watchers:
            James Chiang, Robert Lupton
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              Updated:

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