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3. Turn on the IG software (HKP house keeping package, SCP slitview camera, DTP data taking package) by opening a new terminal and typing:
> cd ~/igrins_admin
>sh icsrunrun_dcticshub.sh
When it launches, the "IGRINS Hub" window will pop up.
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- Using the Telescope Pointing Procedure, go to a brighter target or A0 star (K mag ~ 5-8).
- Then using the SVC (see section below for how), take a test exposure of the target. If it is positioned near the edge of the field of view, move into into the field and take another test image. There is no need to save those acquisition images.
- Measure the FWHM of the star by clicking on it in the center SVC image window, and a profile should appear in the window above it - for more information on how to use these features in the SCV then read the "How to Use Software" page.
- The default focus for IGRINS is 21401140, if you suspect that it is not in focus (especially if the FWHM > 1.5"), then you may want to test different focus values.
- You can politely ask your TO change the focus (steps of 100 or 50 are a good idea) and then take SVC test images at each value, measuring the FWHM. Settle on the focus that provides the smallest FWHM, but don't worry about perfecting it (focus steps of less than 25 are not necessary). Make sure to record the focus that you adopt on the observing log.
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