Details
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Type:
Bug
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Status: Done
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Resolution: Done
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Fix Version/s: None
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Component/s: obs_lsst
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Labels:
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Story Points:3
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Epic Link:
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Team:Telescope and Site
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Urgent?:No
Description
The gain values for corner wavefront sensor amplifiers are the same for intra and extra-focal parts in LsstCam (obs_lsst version
19.0.0-110-ga0aedc1+4ecf52c8e0, w2020_48 ) :
from lsst.obs.lsst import LsstCam |
camera = LsstCam().getCamera()
|
detectorExtra = camera.get('R00_SW0') |
detectorIntra = camera.get('R00_SW1') |
for amp in detectorExtra : |
print(amp.getName(), amp.getGain())
|
for amp in detectorIntra : |
print(amp.getName(), amp.getGain())
|
yields
C10 1.679 |
C11 1.738 |
C12 1.584 |
C13 1.689 |
C14 1.782 |
C15 1.788 |
C16 1.596 |
C17 1.725 |
|
|
C10 1.679 |
C11 1.738 |
C12 1.584 |
C13 1.689 |
C14 1.782 |
C15 1.788 |
C16 1.596 |
C17 1.725 |
They used to be different, as in PhosimMapper:
from lsst.obs.lsst.phosim import PhosimMapper |
camera = PhosimMapper().camera
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detector = camera.get('R00_S22') |
for amp in detector : |
print(amp.getName(), amp.getGain())
|
yields
C10 1.66 |
C11 1.737 |
C12 1.804 |
C13 1.753 |
C14 1.712 |
C15 1.653 |
C16 1.619 |
C17 1.671 |
|
|
C07 1.679 |
C06 1.738 |
C05 1.584 |
C04 1.689 |
C03 1.782 |
C02 1.788 |
C01 1.596 |
C00 1.725 |
The C00:C07 in PhosimMapper are SW1, intra-focal, and C10:C17 are SW0, extra-focal. The makeGainImages.py used to make calibration files for PhoSim depends on these values to be the same between the mapper and the segmentation.txt used by PhoSim to determine amplifier gain.
It is addressed by Robert's
DM-28553(https://github.com/lsst/obs_lsst/pull/286 ) and Craig'sDM-28919(https://github.com/lsst/obs_lsst/pull/292)