One or more detectors do not read out or the Data Taking Package is frozen

First try closing and reopening the Slit View Camera package (SCP) and/or Data Taking Package (DTP) and taking a single (SCP) and Test Exposure (DTP). You might have to kill the packages in the IGRINS Hub GUI under Check Processes before reopening them if one or both are frozen.

If all the detectors read out, then everything is working and you are good to proceed with your observations.

If one or more of the detectors still do not read out or the SCP or DTP freezes, the next step is to try running the detector power cycling and detector reset script.

Follow the steps below.

1. Close both DTP and SCP. You might have to kill these packages in the IGRINS Hub GUI.

2. Open a terminal and do
   cd ~/igrins_admin

3. Execute the following command to cycle power for the detectors.
   sh run_det_pwr.sh

4. Follow the instructions displayed on the screen. When you are ready to proceed, press Enter.

5. Wait until the script has finished running.

6. After the script finishes, wait for an additional 10 seconds.

7. In the same directory, execute the following command to restart the detectors.
   sh run_det_restart.sh

8. Enter the password when prompted. This is the same password as the one for the IGRINS ICC.

9. Follow the instructions displayed on the screen. When you are ready to proceed, press Enter.

10. Wait until the script has finished running.

11. After the script finishes, wait an additional 10 seconds.

12. In the IGRINS Hub GUI, click the Run DTP and Run SCP buttons.

13. Ensure all the detectors are now working. In the SCP take a Single image. In the DTP click Test Exposure.

14. If the recovery procedure doesn't work, you might have to manually power cycle the detectors. Please follow the instructions on this page: https://cloud.wikis.utexas.edu/wiki/x/EgCSb. After the manual power cycling, do the procedure above starting from Step 7 for that detector.

When the H-band detector is restarted, a bright vertical band appears due to transient charge accumulation,. and appears like the image below. Do not panic! This is a known characteristic of the H-band detector that has been present since IGRINS was commissioned in 2014. Despite efforts to resolve the issue in collaboration with the detector manufacturer, Teledyne, it has not been eliminated.

Open

The bright band fades exponentially over time. Because the IGRINS detectors are continuously reset while idle (i.e., when no exposures are being taken), leaving the detectors idle for at leat 1 minutes after re-initialization allows the brightness of the band to decrease to approximately 10–20 counts.

If you are certain that the H-band detector is functioning properly and wish to perform the recovery procedure only on the other detectors, please refer to the Detector Recovery Manual for Experienced Users, Site Staff, or Instrument Team.

When performing on-slit guiding on a very bright target, a numerical error may accumulate in the SCP guiding algorithm, causing SCP to freeze. This issue is entirely unrelated to the detector control electronics.

If the H- and K-band detectors are operating normally in DTP and you suspect that SCP has frozen due to this issue, try closing and restarting SCP alone before cycling the detector power or re-initializing the detectors.