Last night was the first night after the summer shutdown and despite the forecast we were open for most of the night! We’re using MIRAC as the PSF viewer and found the first star pretty fast!
We aligned the pupil, tested the rotational centering, tried the -300mm and -250mm lenses in front of the VisWFS and decided to go with the -250mm lens. Then we took mlats and then many iterations of CACAO testing. Rebooting RC3 and taking care of some of the over zealous logging seemed to help with issues of the CCID-75 seeming to pause or hang. The low is around 60deg F and the ASM sometimes gets close to overheating, so we take a short break and allow it to cool down. The night ended with a hot ASM at the first twilight.
The song of the night is “Peaches” by The Presidents of the United States of America:
Today was the last day of SPIE Astronomical Telescopes & Instrumentation 2024 and tonight was the last night of MAPS June 2024A.
Joseph gave a nice talk (second-to-last of the conference) with MagAO-X data:
Joseph Long giving a talk in the PSF reconstruction session.
Meanwhile at the MMT we tested our previous CACAO calibration, took a new one in better seeing, practiced both Bianca and Lauren running CACAO, and were in the process of more testing when we had to close the dome due to high winds. We waited around until finally calling it a night and a run around 2:30am when the winds continued rising and the clouds came up too.
Here’s our pretty good CACAO loop with 50 modes.
We keep asking Tim and others from MMTO to explain the hexapod to us, but we still don’t understand some of the behavior we see. Last night we had the focus pushed to the limit (near +1600 um), even to the point where the LUT wanted to offload coma but couldn’t send it. So last night we tried starting over: We put the focus to +800 um, let the LUT run for a little while, and lo and behold we were way out of focus. As we focused by eye we ended up back near the limit, around +1600. Tonight, on the other hand, we’re around +700 um and we’re in focus. We asked Brian if the temperature correction is very different and it’s not — well it’s about 50 um different, but that’s not enough to account for the focus difference of around 800 um.
Thanks for a great conference and observing run all!
Full moon over Yokohama
The word of the night is 満月 (Mangetsu) which means full moon.
Today/tonight Dan and Amali went down, Dan and Oli came up, and Craig and Oli went down. Oli brought up six (6) new negative lenses ranging from f=-100 to -1000mm to test the Vis WFS pupil focus. We took another image set with the current lens (f=-300mm) and then swapped it out for each of the other lenses to see the difference in pupil focus and pupil size/separation. Here is what we saw:
Negative lens test, in front of Vis WFS.
Result: The best are f=-200 & f=-300. Oli’s feeling is the best focal length is going to be around f=-250mm. That lens is not available but can be created by combining two lenses. Furthermore, there are other degrees of freedom that can be used to fine tune… namely the separations between the CCID75, CTL, and Pyramid. By adjusting those distances, the overall magnification (pupil size and separation) will change. This is a much more complicated alignment and is destructive since a move cannot be perfectly reversed. So we may try that another time.
Meanwhile we took some ARIES spectra, then went on to closing the CACAO loop with 50 modes and saving some ARIES images. Unfortunately the seeing was around 2-3” so these won’t be great, but it was also a really good practice session for Lauren and Bianca to run CACAO while Amali coached them remotely from Tucson.
There was a dust storm blowing over from New Mexico. Around 3:45am it got worse, and meanwhile the seeing had blown up to above 3” where we were unable to make much progress anyway, so it was time to close for the night. We have 1 more night but the forecast doesn’t look promising, so we shall see.
The word of the night is TEAMWORK. The MAPS team has done a great job this run covering the various tasks even though various people have had to come and go due to life circumstances. Thanks for the excellent teamwork, MAPS team!
We never opened the dome tonight, due to high winds. And in Yokohama it rained hard all day.
Manny went down and Dan came up.
Dan and Amali measured voltages on various pins of the SAPHIRA under Suresh’s guidance. Based on their measurement, the detector temperature matches what is observed by the cold head. So it is not a temperature issue and likely an electronics issue. The next step was to measure two separate voltages to ensure they are correct. They were all around 5V which is where they were supposed to be. Suresh is now crunching the data to see if it gives any other clues to the IR WFS behavior.
The word of the night is たいふう (Typhoon) because apparently all this rain in Yokohama today was actually a small typhoon.
