2021-08-06 Meeting notes

Date

Aug 6, 2021

Place

Zoom meeting:

https://keckobservatory.zoom.us/j/95288908931?pwd=YVQyV2lIckRrbDQ0cDh3VzBLR2tMdz09

Meeting ID: 952 8890 8931

Passcode: 249100

Participants

@Percy Gomez
@sherry yeh
@Carlos Alvarez
@Michael Lundquist
@Shui Hung Kwok

Goals

Progress update on the following topics:
- Contribution from atmospheric refraction.
- Contribution from spherical projection.
- Contribution from optical distortion.
- Matching between target coordinates from the ObjectCat extension and the combination of BluSlit and SlitObjMap extensions.
- User interface

Discussion topics

Time	Notes	Comments

Time	Notes	Comments
10min	Project status	@Shui Hung Kwok showed the status of the latest version of the backend and user interface: Latest version of the backend code does a better job than previous versions in matching the dsimulator output. The discrepancy between the dsimulator and new design tool outputs is < 1pix on the DEIMOS science CCD. The new design tool uses the dsimulator output for several slitmasks to determine an average optical distortion polynomial. Latest version of the user interface starts the web browser automatically. @Michael Lundquist has been working on a Docker version of the IRAF dsimulator to see if we can show intermediate steps of the dsimulator calculations. This version is not ready yet.
60min	Discussion	Most of the discussion was focused on what is the best approach to determine the optical distortion polynomial: An average polynomial based on the dsimulator output for several slitmasks. The original polynomial used by the dsimulator code. It would be useful to compare the output data using both approaches for the optical distortion polynomial. The objective is to match the output from the new design tool to the output from dsimulator. It is possible that the approach based on the average polynomial may include a combination of atmospheric refraction and optical distortion, rather than only the optical distortion component. The disadvantage of using the original polynomial from dsimulator is that we don’t know how it was obtained. We need to provide feedback on the user interface to make progress in that front in parallel to the work on the backend. Even without the capability of showing intermediate steps, a Docker version of the dsimulator would be extremely useful for the DEIMOS users community until the new slitmask design tool can be released for operations.
30min	Next steps	See action items

Action items

@Carlos Alvarez to provide @Shui Hung Kwok with the original dsimulator distortion polynomial, which is available in Luca’s Jupyter notebook, in a format that can be used in the current version of the slitmask design tool.

@sherry yeh and @Carlos Alvarez to design 5 slitmasks each fulfilling the following requirements: (1) Input files with ~100 targets, and (2) output files with ~20 targets evenly spreaded over the four CCDs. The slitmask should have different PA’s and may correspond to any region of the sky.

@Shui Hung Kwok to provide an updated version of the user interface in the project’s GitHub page.

All of us to test the updated version of the user interface, once available, and send feedback to @Shui Hung Kwok . Ideally, we would want to test it on different operating systems and web browsers.

@sherry yeh to provide @Shui Hung Kwok with the notes that she already has containing feedback on previous versions of the user interface.

@Michael Lundquist to continue working on a Docker for the IRAF version of the dsimulator.

@Carlos Alvarez to provide @Michael Lundquist with input catalogs that can be used to test the Docker version of dsimulator.

@Carlos Alvarez to write a script that takes as an input the dsimulator output FITS to generate the dsimulator output ASCII file.

Staff Astronomers