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Type:
Task
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Status: Done (View Workflow)
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Priority:
Normal
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Resolution: Done
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Component/s: pfs_utils
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Labels:
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Sprint:preRun24Sep2025
Several raster scan was carried out in the run 24 in September 2025.
The data shows that offset on the telescope plane needs to me updated.
In addition, the several set of MCS images with cobra at home position revealed that PFI position transformed from MCS position is highly deviated from expected position.
(In the above figure, displacement of FFs and every 100 fibers are plotted.)
The shift is on a given pattern, which quite resembles to that seen HSC and MCS test with pin-hole mask. Also, the displacement is scaled by zenith angle. This pattern was actually implemented in the past, but its elevation dependency was not considered (measured). This displacement affects distortion measurement by FFs in later stage.