- On the k2aoserver-new:3 VNC desktop, select from the
background menu NGS-AO Control → Start NGS
calibrations
- Launch NIRC2 GUIs. On the k2aoserver-new:2 VNC desktop,
select from the background menu:
- NIRC2 Menu → NIRC2 waikoko-new terminal
- NIRC2 Menu → Start Quicklook
- NIRC2 Menu → Start NIRC2 Status GUI
-
Optional: On the waikoko-new terminal,
type newdir if you would like to save the NIRC2 images
in a new data directory. If the directory for
user nirc2eng and current UTC date already exists, no new
directory will be created.
- Keck II Calib → Calibration setup. If prompted:
- Select NIRC2
- Select NGS-AO
- SC GUI → SF (SFP) → obsfname → nirc2
- Keck II Calib → Light Source Control
- 1% = ND2
- If HEPA still on, Click for HEPA OFF
- Check that the AOACQ GUI is in simulator mode (Aoacq - vX.Y
CLS Archon SIMULATION MODE). Otherwise, start the AOACQ GUI in
simulator mode from the VNC pulldown menu:
- K2 AO Tools → AO Acquisition (Simulation)
- In the Aoacq GUI:
- mR → 11.5
- AO Mode: NGS-AO
- Ref: NIRC2
- Seeing: 0.0
- Background WFS: Auto
- Run Setup bench
- Setup NIRC2 and take an open-loop image.
-
If this is not a continuation of the AO
calibrations, then you will need to load the latest
image-sharpened DM voltage map. Otherwise, the open-loop
PSF will look like a speckle cloud. This should not affect the
closed-loop image quality, though.
-
In a waikoko-new terminal:
- Check the open-loop image quality
- Quicklook → Plot → Gaussian Fit.
- Note the XFWHM,YFWHM. They should be less than 4.5
pix if the latest sharpened DM voltage map was
loaded. An elongated PSF or a PSF with FWHM > 4.5
pix is considered poor. If the latest sharpened DM
shape was not loaded, then the PSF will look like
a speckle cloud and the open-loop image quality can be
ignored.
- Aoacq GUI → Acquire star
- MAORI → AO Control
- TT gain → 0.1
- DM gain → 0.1
- In a NIRC2 control terminal type (goi) to take an
image with the AO loops closed.
- Check the closed-loop image quality
- Quicklook → Plot → Gaussian Fit.
- Note the XFWHM,YFWHM. They should be less than 4.5
pix. An elongated PSF or a PSF with FWHM > 4.5
pix is considered poor.
- Open the AO loops if they are closed: MAORI →
AO Control → LOOP → OPEN
- Light Source Control → 1% = ND2
- Start the LBWFS Img Acq GUI, if it has not been started yet
-
In the Aoacq GUI:
- mR → 13.0
- AO Mode: NGS-ST
- Ref: NIRC2
- Seeing: 0.00
- Update mR: OFF
- Run Setup Bench
- If prompted, select Sodium dichroic
- Set FPS: m o1fps=20
- Acquire star
NOTE: The mR magnitude is set to a fainter value that it
actually is to ensure high enough signal on the WFS.
- MAORI → AO Control
- TT gain → 0.1
- DM gain → 0.1
- Take a closed-loop image with NIRC2. In a NIRC2 control
window type ao_confirmation, which
will do the following:
set the object name to "ao_confirmation"
set filt brgamma
set camera narrow
set pupil open
set shutter open
set grism clear
set sampmode 2
set subc 512
set tint 0.5
set coadd 20
set wait4ao off
Takes an image using goi
IMPORTANT NOTE: The same ao_confirmation script
should be used for NGS-AO and LGS-AO image quality checks after the K2AO
light source was replaced with the fainter K1AO source in June 2025.
- Check the closed-loop image quality:
- Quicklook → Plot → Gaussian Fit.
- Note the XFWHM,YFWHM. They should be less than 4.5
pix. An elongated PSF or a PSF with FWHM > 4.5
pix is considered poor.
- On the the LBWFS Imag Acq GUI:
- Change the integ(s) to 2.0 seconds
- Click Loop
-
Manual LBWFS focus control. Read the focus value (mm) of
the black curve (left Y axis) on the Low-Bandwidth Manager
GUI and subtract the value from the position of the FCS
stage. This can be done using one of the following two methods:
-
Option 1: SC GUI → WF (FCS) → obwf , update value
in the green box and hit S
-
Option 2: On a k2aoserver-new terminal type:
-
s obwf to show the current FCS focus value
-
m obwf=new_value to move the FCS focus to the
new position
The black line on the Low-Bandwidth Manager GUI should be
reporting near zero after the FCS move is sent. The focus is fine
if the values are <0.15mm.
-
Close COG control on the Low-Bandwidth Manager GUI
after correcting the focus and make sure to let it run for at
least 10 iterations. Verify that the fast WFS COG updates on
the Low-Bandwidth Manager GUI. Evaluate performance:
-
Take additional NIRC2 images. The image quality should
still be acceptable after 10 iterations of the LWBFS COG
control loop.
-
The reported RMS WFE (red plot in the Low-Bandwidth
Manager GUI) should be ≤ 250nm after it
converges. The value should improve with the COG control loop
closed. If it fails to converge either the
configuration is wrong, e.g. insuficient light in the LBWFS,
or the calibration is wrong.
-
Once you are done:
-
Hit HALT on the LBWFS Imag Acq GUI
-
Uncheck the cog ctrl box on the Low-Bandwidth Manager
GUI
-
Open AO loops: MAORI → AO Control → LOOP →
OPEN
- In a NIRC2 control window type shutter close
- Keck II calib → Shutdown AO Bench
-
If AO loops are still closed, select Open loops.
- Keep WFC in NORMAL if the bench will be used within
the next hour. Otherwise, put WFC in STANDBY.
- Put STRAP in STANDBY? Select No if the bench will be
used within the next hour. Otherwise, select Yes.
-
Acknowledge popup message indicating OCAM2k will be warmed
up by pressing OK.
- Select Turn HEPA ON if none of the conditions
specified in the popup message are fulfilled.
- Turn AO light source off (select Yes in the popup
message) if AO bench work is completed and there is no
intention to resume work any time soon.
-
Answer Yes to send the SFP to the Telescope
position if the AO bench needs to be prepared for night
observing.
- If you need to "manually" move the SFP to the
telescope position, in the SC GUI
- SF (SFP) → obsfname → prehome (wait
until INPOS)
- SF (SFP) → obsfname → home (wait
until INPOS)
- SF (SFP) → obsfname → telescope
- In the case of NGS-AO calibrations, select on the
background menu NGS-AO Control → Stop most NGS-AO
Software
- In the case of LGS-AO calibrations, select on the background
menu LGS-AO Control → Stop most LGS-AO Software
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