After some discussion with Zahra, we've
deduced that we only arrived in Eureka yesterday. This took some
calculation and puzzling. I logged into my blog account today with a
guilty sense of “I didn't even write to say we've arrived! I guess
if I just do a few days' of posts, I'll catch up soon”. Well. I
don't feel so bad now that I realize we've barely been here for 30
hours.
I'll catch you up anyways. Because we
did some stuff.
Breakfast was good this morning! I'm
pretty sure Roxanne thinks my breakfast standards are low because I
was quite happy to find my way to a delicious bowl of porridge. She
probably doesn't know just how much I LIKE good porridge. There were
eggs and pancakes and other things too, but porridge is delicious.
Plus, you can decorate it with colourful fruit.
Sham is studying water vapour, so we
were anxious to get the ultraviolet laser put back together today.
Chris was going to help us align things in the sky, so we were at the
mercy of his schedule in Halifax. Clear skies are also needed. We had
both lined up for today, conveniently. We started in first thing.
Sham got the pump chamber in with not too much trouble, but the hoses
for the cooling system needed some gaskets replaced. That
accomplished, we got the UV laser prepped for alignment and
measurements.
I was sort of dreading that moment.
Putting hardware back together makes me happy. Aligning cranky laser
beams can sometimes make me want to cry. Today, however, alignment
went very smoothly. Sham had some good ideas for how we could tell
how far out of alignment we were starting, and combining that with
the usual procedure helped confirm that we were on the right track. I
don't think I've ever experienced such a straightforward alignment in
my life. Both the UV and Green laser beams were able to be aligned on
the optics table in really sensible ways. Chris started the software
for alignment in the sky (to get the telescope and the laser beam to
look in the same place for each other), and found that BOTH laser
beams were within the field of view of the scope already. He didn't
have to tweak the alignment much before starting the auto-align
program. Even that procedure went well.
The only problem we had all day was one
laser turning itself off because I left two cables plugged in that
were not necessary (they're for when you only want to fire one shot
at a time by pressing a button. I didn't know that the lasers don't
like having them plugged in when they're not required), and the laser
did not realize that when I put “P-zero-zero” in as a parameter,
I really meant “P-zero-one”. It flashed once, and then stopped.
Just like I told it to. I gave it some new instructions, and it did
those, too. The right ones, this time.
In case you (especially Meike) are
interested: I also spent time today staring down a tube at a smallish
mirror under a dark inaccessible window at -50 C on a roof in order
to watch said mirror rotate by one degree. Maybe less. Slowly. It was
thrilling, let me tell you. [Yes, it was useful also. And didn't
actually take that long. And I got to go outside during daylight
hours.]
Smallish mirror down a dark tunnel. When it moves, it doesn't move much.
We came back to the station once both
lasers were firing, and all detection channels were detecting. It's
been on the go ever since! Calibrations on the depolarization channel
start in earnest tomorrow with us drilling holes through boards.