Author: Joseph Long

Just for today, my friends, we have an unbeatable special offer: with each concurrency bug you find, we will throw in another concurrency bug for free!

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Call now! Or, if you prefer an event-driven programming model: let us call you with this exclusive offer!

Okay, now that I’ve gotten that out of my system: we have been vexed by concurrency bugs today. These are the absolute worst. To reproduce them, you must get everything just right. (In astronomical instrumentation, that can sometimes literally mean the stars aligning.) Then, once you’ve reproduced it, you’re still only halfway to figuring out which element of your system caused it.

To make a long story short, my PurePyINDI library wasn’t equipped for the huge numbers of elements Kyle wanted to control. Once I sorted out the locking in PurePyINDI, Kyle was able to apply his eye doctor script (previously blogged about) on more than the previous maximum of 36 modes. (Modes, for the uninitiated, are a bit like “things that can go wrong”. The more modes you can take to the doctor, the better your images will be.) Now we can theoretically access the 1000+ modes CACAO spits out when we take a system response matrix, and make our images very sharp indeed. On the way there, we get a bit of an Eye of Sauron look:

I’m not even going to tell you about the bugs in the linear stage logic we shook out today. As soon as we squashed one, we found another, more subtle one. And another. Until we were all quite sick of stages.

This was also the day of a very important MagAO-X ceremony. Today, at 9:00 A.M., Laird and Alex unveiled the dedicatory tailpiece and plaque, which surround (and cover, when not in use) the hole for the MagAO-X eyepiece.

Here’s a closer look:

According to Professor Close, it is traditional for a new instrument to be adorned with a tailpiece as a sort of maker’s mark once it’s complete. Great work, everyone!

In honor of Kyle’s Eye of Sauron, “Ring of Fire” by Johnny Cash is MagAO-X’s Song of the Day.

This was, incredibly, a zero-viscacha day. It was quite windy, a bit chilly, and there may have been a viscacha conference (¿visconferencia?) in the next valley over.

Meanwhile, in MagAO-X land, we continue pushing buttons on our computers and watching what happens. I promised a peek at the MagAO-X web interface, so here’s part of it… that no visiting observer will ever see!

While most of the web-based interface will be designed for the needs of guest observers, this screen is definitely an “authorized personnel only” deal. With it, you can remotely power on or off anything in the instrument! I was authorized by Jared to toggle the acquisition flip motor power on and off during testing.

While it was a zero-viscacha day, it was also a one-snake day! Jared encountered a juvenile Philodryas chamissonis on his run. This species is known locally as la culebra de cola larga. In a juvenile spirit, I feel I should share that this could be translated as either “long-tailed snake” or “long-butted snake”.

Following Emily’s theme of Firsts, and because I’m very unlikely to have the chance to attach this song to the actual first light post: “First Light” by Balmorhea.

Two days left on the mountain, and two people left from our group. This morning Laird, Amali, Emily, and Katie headed back to Arizona. That means that it’s just me and Jared here from the XWCL. I have another full day, while Jared remains until Wednesday—with only the video chats of Olivier Guyon (international astronomical man of mystery) for company.

We have returned from the “day and night” schedule to a more standard day schedule, which meant we were at breakfast to see them off this morning.

Today, I finished some network configuration and handbook updates; held hoses and ladders while Jared did some real work; and (mostly) worked on the MagAO-X “friendly” GUI. It’s still in need of formatting polish, so I’ll show you a screenshot some other time. Instead, behold the Desk of Penance.

Among the things I held under Jared’s direction: a funnel and hose assembly for glycol dilution. Fancy astronomy instruments generate a lot of heat, and all their major components need liquid cooling (like a l33t g4ming r1g). Our cooling pump was not pushing coolant through as quickly as it should, and Povilas Palunas (Telescope Scientist here at LCO) suggested we might be viscosity (viscachity?) limited.

So, we replaced about 5 liters of glycol solution with distilled water, and now all our fancy components are happy again.

Aside from that, no excitement to report. Which, compared to yesterday, is definitely a good thing.

In compliance with Blog Rules 2019B-X, I present a foxy tune by Courtney Barnett: “Dead Fox” off of her 2015 album Sometimes I Sit and Think, and Sometimes I Just Sit.

Friends, this was supposed to be a celebratory blog post.

My web-based interface to MagAO-X is getting to the stage where it’s actually useful. My suitcase finally arrived from airline purgatory. I finished my SPIE 2020 abstract. I found out how to make the soda machine dispense plain fizzy water (my one non-caffeinated vice).

However, fate had other plans for this author.

One of the reasons for constant comings and goings of MagAO-C and MagAO-X personnel here at LCO is that the P.I. foresaw the need for periodic supply missions from Tucson, as the unpacking process gradually revealed what we’d forgotten to stuff in the shipping containers back in October. (Alas, that he could have foreseen what would befall poor Megadesk!)

Among my items to hand-carry was a monitor mounting plate from the exquisite quadruple monitor stand in our lab in Arizona to stand in for a missing part in the corresponding quadruple monitor stand in Chile.

Of course, LATAM and American conspired to lose the suitcase containing this, replacement clean-room booties, 3/8″ plastic tubing, Fruit Snacks for Kyle, MagAO-X hats and stickers, and all of my clothes.

(I set out from Tucson on Saturday, and by the time the suitcase caught up to me Wednesday afternoon I was likely offending staff and scientist alike with my single pair of jeans that were last considered clean five whole days ago.)

Naturally, as soon as the bag arrived, I gathered up all the MagAO-X special deliveries and ferried them to the clean room. A viscacha was perched above the loading dock—normally an auspicious sign.

In this case, however, it proved a dark portent—as I shall explain shortly.

This was also the end of the MagAO run, meaning it was time to remove from the telescope Clio2, VisAO, the MagAO Nasmyth unit, and the crown jewel—the MagAO adaptive secondary. Both extremely heavy and extremely delicate, its removal is a multi-person job involving many observatory personnel under the watchful direction of MagAO P.I. Laird Close. If you are concerned about the aforementioned omens, fear not—MagAO’s removal was a complete success! As I’ve blogged (and assisted) with this before, I’ll confine my comments to what’s new this time.

This afternoon was a first for MagAO-X and MagAO-C: two generations of Magellan adaptive optics systems (and their P.I.s) in the same cleanroom!

But let us return to my shame, my downfall, the tragic demise of Megadesk-LCO. I slotted in the new brackets and attempted to affix all four monitors to the stand. The last one proved unable to fit, requiring some adjustment to the height of the arm that supports the three monitors arrayed horizontally.

The following conversation took place, somewhat portentously.

Me: “And this monitor stand—it’s not clamped to the desk, or anything?”

Jared: “No, it’s pretty stable with just the base plate.”

Me: “Wow, I need one for myself”

Jared: “Here’s the instruction manual. You finish up here; I have to go upstairs and finish a proposal.”

About five minutes later, the monitor mount was on the floor. You see, I made a classic blunder: forgetting about simple machines. When I removed the first monitor and turned to set it down somewhere safe, I didn’t consider the lever action of the horizontal mounting bar. With the mount in a partially disassembled state, its center of gravity went sideways… and so did it, slowly at first and then all at once.

There was one casualty, a 4K monitor in the lower right position that landed “buttered-side down”. Your author, appropriately mortified, informed the P.I.

Penance was assigned.

Anyway, we now have 0.75 of Megadesk. And an order for a new monitor.

To not end on a totally negative note, here’s a panorama I took on the road to the Magellans that would be ideally suited for a desktop background with the new three-up monitor arrangement.

The blog rules state today’s Song Of The Day must relate in some way to the last MagAO-C post’s song of the day (which was “Gangnam Style” by Psy).

They do not state the connection must be obvious.

Here’s “Essentially” by Japanese Breakfast (and no, I don’t think Psy is Japanese!)