This is a summary of normal IGRINS use for observers at the McDonald 2.7m telescope
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Go out in the dome
Go to the old control room (Colossus Control Room) and press each of these buttons:
Go to the console and press "Reset". You will hear a click as the breaks preventing the telescope from moving are released. There should be no messages on the TCS now.
Point the telescope to Zenith
Go to the TCS, click the "Next" menu, click "Zenith", and click "Yes" on the warning message that pops up.
Click "Go Next" at the top of the TCS window.
Push the Autoslew button in the dome to move the telescope to the Zenith.
Use the console to open the telescope mirror cover
Set up IGRINS and telescope for taking calibrations
Raise the east platform so you can reach the top of IGRINS
Open the shutter on top of IGRINS is for taking flats
Be sure to secure the window cover arm using the velcro.
Lower the east platform back down.
Move the telescope to the Flat position
Go to the TCS, click the “Next” menu, click “Flat”, and click “Yes” on the warning message that pops up.
Click “Go Next” at the top of the TCS window.
Push the Autoslew button to move the telescope to the Flat position.
Use the yellow hand paddle to move the upper wind screen all the way down to reveal the full flat screen.
Use the TCS to move the telescope dome to the “Park” position
Go to the TCS, click the “Tools”, click “Park”, and click “Yes” on the warning message that pops up.
Turn off all the lights in the dome.
In the Observing Room:
In the DTP on the ICC:
Click the “FLAT-OFF” button below the K-band image plot (box 1).
Click “Yes” on the pop-up that appears (this just fills in the Object Name and Exposure Time in the DTP).
This will fill the Seq Bar with 10 x E frames, change the object name, object type, and set the exposure time (boxes 7, 3, and 6).
If there are 3 flat lamps working you will need 30 second exposures, if all 4 are working then 20 second exposures will do.
Change the exposure time to 30 seconds (box 6; if not already set to that).
Change the Object Name to “FLAT 30s” (box 3; if not already set to that).
When ready to take the FLAT-OFFs, click the “Start/Resume Sequence” button (box 8).
FLAT OFF frames should take about 10 minutes to complete. Computer will say "H finished", "K finished", “Sequence finished” when they are done.
Back to the dome to turn on the Flat lamps for FLAT ON frames
Move the rolling stairs from their stowed location to on platform east under the telescope
Ensure the location you place the rolling stairs is clear of the telescope or off the moving platform entirely
Raise the platform using the yellow hand paddle until you will be able to reach the plug for the flat lamps on the side of the telescope
!! Make sure you do not get close enough to bump IGRINS with the raising platform !!
Plug the flat lamp power cable into the side of the telescope, see images below
In the Observing Room:
In the DTP on the ICC...
Click the “FLAT-ON” button below the K-band image plot (box 1).
Click “Yes” on the pop-up that appears (this just fills in the Object Name and Exposure time in the DTP).
This will fill the Seq Bar with 10 x E frames, change the object name, object type, and set the exposure time (boxes 7, 3, and 6).
If there are 3 flat lamps working you will need 30 second exposures, if all 4 are working then 20 second exposures will do.
The target peak counts per FLAT exposure are should be between 6,000 and 10,000 counts. Inspect the FLATS in DS9 to ensure that this was achieved. You can also check the peak flux counts in the SNR quicklook tool (see 1.b. in the Setup above).
Change the exposure time to 20 30 (or 3020) seconds (box 6; if not already set to that).
Change the Object name to “FLAT XXs” 30s” (box 3; if not already set to that).
When ready to take the FLAT-ONs, click the “Start/Resume Sequence” button (box 8).
Flat On FLAT ON frames should take about 10 minutes to complete. Computer will say "H finished", "K finished", and “Sequence finished” when they are done.
Turning off Flat Lamps/stowing wind screen
If you changed the FLAT exposure time in the FLAT ON process, then retake the FLAT OFF exposures with the same exposure time.
Close the telescope mirror cover on the console so nothing falls on the mirror when moving the upper wind screen
Move the upper wind screen back to its original position using the yellow hand-paddle
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Move the telescope to Zenith
Using the TCS select Next → Zenith and click yes on all of the pop-up windows.
Click “Go Next” at the top of the TCS window.
Slew the telescope to Zenith by holding down the Autoslew botton on the dome floor console.
Ensure the rolling ladder is not on the raising platform.
Use the yellow hand paddle to raise platform east until you can comfortably reach the mount that connects IGRINS to the telescope.
Not so high that IGRINS or the electronics rack will hit the platform floor!
Get the wheel attachment from the red tool box on the opposite side of platform east (near the ladder that brings you to the second floor in the dome).
There are four screws on the IGRINS rotator plate that need to be loosened.
3 should have star-like handles you can manually loosen (unless a Darrin has been applied recently… then good luck)
The last screw requires a specialized wrench kept..[I don't know where this is kept; a picture of the wrench and the special bolt would be good]
Once all of the screws on the rotator plate are loosened, attach the wheel attachment to the rotator peg on the rotator plate.
This can be a little fussy to attach because the wheel and peg have interlocking parts, so a headlamp or flashlight can be helpful for getting the right orientation of the wheel.
You’ll know the wheel is in position when it is near flush against the rotator plate.
Turn the wheel to rotate IGRINS in the appropriate direction.
This requires some elbow grease!
If you have difficulty moving IGRINS with the wheel alone, attempt applying some pressure on the edges of the electronics rack to loosen the rotator plate.
DO NOT PUSH ON THE CRYOSTAT
Encoder settings for different position angles can be found here.
Once you think you are close to your desired rotation position check the value on the encoder and adjust as needed.
Once you reach the desired position
Remove the wheel and return it to the tool box.
Screw in the 3 star-handled screws on the rotator plate. They should be tight!
Use the wrench to tighten the last special screw and return the wrench to it’s found location.
Verify that the cooling cables are NOT UNDER THE PLATFORM before using the hand paddle on the dome floor console to lower platform east.
This may require that you lower the platform a little, jump off, adjust the cables, and continue lowering the platform (repeat as needed).
In the control room:
In the ICC on the SCV GUI change the the rotator value (box 10) and on the TCSProxy change the rotator value.
Resume observing!
Note: the on sky drift for guiding while observing is always higher when IGRINS is not in PA = 90 deg, so you may have to adjust the frequency that the guiding offsets are sent to the TCS (box 15 in the SCV GUI).
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Move the telescope to Zenith
Using the TCS select Next → Zenith and click yes on all of the pop-up windows
Close the IGRINS window cover
Rotate IGRINS back to a PA of 90 degrees, if needed
Raise the east platform using the yellow hand paddle
Close the IGRINS window cover using the handle
Be sure to secure the handle using the velcro strip
Stow the telescope
Using the TCS select Next → Stow and click yes on all of the pop-up windows
Press and hold the button on the dome floor console to move the telescope to the stow position
Close the Mirror Window Cover
Using the button on the Colossus Console (the console in the dome with all the red buttons). You should hear the motor stop when it is fully closed.
Close the dome
Using the button on the Colossus Console. There will be a loud sound when it finishes closing.
Put any wind screens that are over the dome slit back to their stow positions using the hand paddle
Park the dome
Using the TCS select Tools → Park Dome and click yes on all of the pop-up windows
Close the dome doors
Close the dome vents
Using the control panel on the East side of the dome near the door
E-stop the telescope
Using the button on the Colossus Console
Turn on the passage lights (only once dome is closed fully)
Using the button on the Colossus Console
From the control room
Log-out of ATLAS
Click the power button on top right hand side of the lower monitor
Turn off the heater in the observing room
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