-
Notifications
You must be signed in to change notification settings - Fork 62
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Merge pull request #584 from mperrin/release_1.1_prep
Release 1.1 prep
- Loading branch information
Showing
11 changed files
with
370 additions
and
250 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,48 +1,35 @@ | ||
Appendix: Available Optical Path Difference (OPD) files | ||
================================================================ | ||
|
||
.. warning:: | ||
|
||
This page documents the _pre-flight_ models for JWST wavefronts. These models are now happily obsolete, and can be replaced by | ||
`actual measured in-flight wavefronts <https://webbpsf.readthedocs.io/en/latest/jwst_measured_opds.html>`_. | ||
|
||
For each of the five instruments (four SIs plus FGS) there are three provided OPD files. These represent wavefronts as follows: | ||
|
||
1. The OTE and ISIM intrinsic WFE | ||
2. The above, plus a slight defocus to blur the image slightly to approximate image motion. | ||
3. The above #2, plus additional WFE due to SI internal optics. | ||
|
||
The latter is the largest WFE, and is the default file used in simulations unless another is explicitly chosen. For NIRCam only there is a second, duplicate set of these files with slightly improved WFE based on an optimistic case scenario for instrument and telescope alignment. | ||
|
||
The provided OPDs are based on the observatory design requirements, and were developed for the Mission Critical Design Review. The represent the nominal case of performance for JWST, and have not yet been updated with as-built details of mirror surface figures, etc. We intend to make updated OPD files available once suitable reference data have been provided to STScI. For now, see `Lightsey et al. 2014 <http://adsabs.harvard.edu/abs/2014SPIE.9143E..04L>`_ for recent predictions of JWST's likely performance | ||
|
||
Note that the trick of adding some (nonphysical) defocus to blur out the PSF is computationally easy and rapid, but does not give a high fidelity | ||
representation of the true impact of image jitter. This is particularly true for coronagraphic observations. Future versions of WebbPSF will likely | ||
provide higher fidelity jitter models. | ||
|
||
The units of the supplied OPD files are wavefront error in microns. | ||
|
||
.. table:: Rev V OPDs | ||
|
||
========================= ========== ======= ======================== ========================== ======= | ||
File Instrument RMS WFE Includes OTE + ISIM OPD? Image motion (as defocus)? SI OPD? | ||
========================= ========== ======= ======================== ========================== ======= | ||
OPD_RevV_fgs_150.fits FGS 150.0 Yes No No | ||
OPD_RevV_fgs_163.fits FGS 163.0 Yes Yes No | ||
OPD_RevV_fgs_186.fits FGS 186.0 Yes Yes Yes | ||
OPD_RevV_miri_204.fits MIRI 204.0 Yes No No | ||
OPD_RevV_miri_220.fits MIRI 220.0 Yes Yes No | ||
OPD_RevV_miri_421.fits MIRI 421.0 Yes Yes Yes | ||
OPD_RevV_nircam_115.fits NIRCam 115.0 Yes, optimistic case No No | ||
OPD_RevV_nircam_123.fits NIRCam 123.0 Yes No No | ||
OPD_RevV_nircam_132.fits NIRCam 132.0 Yes, optimistic case Yes No | ||
OPD_RevV_nircam_136.fits NIRCam 136.0 Yes Yes No | ||
OPD_RevV_nircam_150.fits NIRCam 150.0 Yes, optimistic case Yes Yes | ||
OPD_RevV_nircam_155.fits NIRCam 155.0 Yes Yes Yes | ||
OPD_RevV_nirspec_125.fits NIRSpec 125.0 Yes No No | ||
OPD_RevV_nirspec_145.fits NIRSpec 145.0 Yes Yes No | ||
OPD_RevV_nirspec_238.fits NIRSpec 238.0 Yes Yes Yes | ||
OPD_RevV_niriss_144.fits NIRISS 144.0 Yes No No | ||
OPD_RevV_niriss_162.fits NIRISS 162.0 Yes Yes No | ||
OPD_RevV_niriss_180.fits NIRISS 180.0 Yes Yes Yes | ||
========================= ========== ======= ======================== ========================== ======= | ||
|
||
On-Orbit OPD Measurements | ||
------------------------- | ||
|
||
The default OPD in WebbPSF is now an on-orbit measured OPD from early in cycle 1 science operations: | ||
|
||
* `JWST_OTE_OPD_cycle1_example_2022-07-30.fits`: The specific OPD measurement selected, from 2022 July 30, intentionally represents a slightly conservative alignment state (after a couple weeks of relative stability, shortly before a next wavefront correction). This is about a 75th percentile performance level, based on operational experience during the first few months of cycle 1. Most observations will have OPDs similar to this, or slightly better; a smaller number will have not quite as good. | ||
|
||
This intentionally-slightly-conservative OPD was chosen for use in the cycle 2 ETC and is set as the default here for consistency. | ||
For modeling PSFs of science observations, it is generally best to retrieve and use the | ||
`measured in-flight wavefronts <https://webbpsf.readthedocs.io/en/latest/jwst_measured_opds.html>`_ based on the date of | ||
the science observation. | ||
|
||
|
||
|
||
|
||
Pre-Launch Model OPDs (Obsolete) | ||
--------------------------------- | ||
|
||
Prior versions of this page documented the _pre-flight_ models for JWST wavefronts. These models are now happily obsolete, and can be replaced by | ||
`actual measured in-flight wavefronts <https://webbpsf.readthedocs.io/en/latest/jwst_measured_opds.html>`_. | ||
|
||
|
||
Most pre-launch predicted OPDs are no longer included in the WebbPSF data files distribution. The only such files still | ||
included are | ||
|
||
* `JWST_OTE_OPD_RevAA_prelaunch_predicted.fits.gz`: This contains predicted OPDs based on the best available optical models at the time of launch, including the calibrated, known surface figures of each mirror as measured in ground testing. For most purposes this is superceded by the on-orbit measurements. It is retained for back-compatibility mostly. | ||
|
||
|
||
For any cases in which you may need further information about the other pre-launch predicted OPD files, | ||
consult the `older versions of this page hosted on readthedocs<https://webbpsf.readthedocs.io/en/v0.9.0/available_opds.html>`_. | ||
|
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Large diffs are not rendered by default.
Oops, something went wrong.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters