SCExAO: The World’s Highest Altitude Pyramid WFS

I’m on Mauna Kea visiting Olivier Guyon and the Subaru Coronagraphic Extreme AO (SCExAO) system. At 13,800 feet I’m pretty sure this is the highest altitude pyramid AO system in the world. Despite having a pyramid wavefront sensor, SCExAO is a pretty different AO system from MagAO. For one thing, there isn’t an adaptive secondary. Instead, the deformable mirror is on an optical bench off to the side. SCExAO is also not the only AO system – before light gets to SCExAO it has been corrected by the AO188 system, which is the AO workhorse of the Subaru telescope.

The SCExAO+VAMPIRES+FIRST teams hard at work.

SCExAO hosts several science cameras, including VAMPIRES and FIRST which are being engineered on this run. I’ve also seen some impressive demonstrations of low-order wavefront sensing, focal plane wavefront sensing, and speckle nulling. SCExAO has some really exciting high contrast imaging capabilities.

The SCExAO pyramid pupils and the H band PSF.

As you can see, the SCExAO team is very creative with their camera displays. They consider Chuck Norris to be their spiritual leader, though somebody seems to like My Little Ponies.

Nem operates the Brony cam.

Mauna Kea is high, and the air is thin up here.

The two Keck telescopes and Subaru. Click for more cowbell.

We stay at Hale Pohaku (HP), which is at a more comfortable 9000 feet.

The dorms at HP. Not as cozy as LCO, but very nice.

One thing that I learned during this visit is that if Olivier ever asks you to go for a walk, you say NO. What he considers a “walk”, most people would consider “rock climbing in the dark”.

Mauna Loa through the clouds. I thought maybe this was when we’d turn back. I was wrong.

The view is amazing from up here.

The sunset from Subaru’s observation porch.

The view to the northwest just after sunset. Click for more cowbell.

Being back in Hawaii reminds me of old times. The song of the day describes one of life’s enduring mysteries, which I still have little insight into.

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