Dec 2022 Chile Trip, Urbach

Trip Summary

1. Differential temperature sensor and 3D anemometer now working again. Put in hose clamps to secure the differential temperature sensor.
2. Tested the summit electrometer CSC and got it to read out a photodiode. Got Kevin to order parts to properly hook up the photodiode to the electrometer so it can measure background light in the dome and on ComCam.
3. Used the Canon camera to do tests of the AuxTel focus as a function of M2 position. Concluded that the M2 position is not limiting AuxTel focus (but astigmatism is significant) AuxTel_Focus_Tests.pdf
4. Twanged the M2 rods on AuxTel and looked at the EFD accelerometer data, and saw clear 20 Hz and 60 Hz resonances on M2. twanging_notes_121522.pptx. That implies 20 Hz is the fundamental frequency of the M2 rod system.
5. Made an inventory of the items we have. Also took a video but it's too big to upload, so see below for inventory.

Day log:

Note, see Rubin trip Nov 2022, Stubbs for log for day 1, Dec. 2, 2022.

Dec. 5, 2022

SHWFS

After recharging the battery, the camera now connects fine and can be remotely controlled by the Mac mini. Screensharing on the Mac mini still works. I think we're basically ready to take this on-sky again.

Anemometer

Power supply arrived. The new connections are more secure and the labjack is immobilized in a box. Also, Wouter will try to put this into the CSC in January. But for now we are taking data with the Mac mini.

Example 1 minute of anemometer test data (where I fanned it in the middle). Data is in anemometer_test.db

Now I've started a scan that should last for the duration of the observing run (of course, we can stop and move the anemometer if we want - right now the anemometer is on the table at the edge of the dome, as it was in May). It's called anemometer_2022_DecA.db. Here's an initial look:

Note - the dome is closed right now.

Differential temperature sensor

Also started a run that should last until Friday afternoon, and thus cover the whole observing period. (I will of course check periodically to make sure it's still saving the data.)

Dec. 6

Got a DHCP reservation for the new Mac that will run the DIMSUM:

auxtel-macmini03.cp.lsst.org
139.229.164.205

It can now connect to the RubinObs-LHN wifi and it's possible to ssh into the computer.

Also installed globus endpoints on the meerkat and the anemometer Mac mini. Just need to tar the data and then it can be transferred to the RC storage.

Details of the installation of DIMSUM are detailed in Ali's logbook.

Dec. 7

Recovery from internet connection loss

Power was lost on the summit the night of the 6th. It was fixed the morning of the 7th. After it was fixed I still did not have an ssh connection to the anemometer Mac mini and the meerkat temperature probe. I connected a screen + mouse + keyboard to both computers. For the meerkat, I just had to connect and log back in. I did not have to restart the computer. I can ssh into it and it has continuously taken data throughout the whole period. For the Mac mini, it was frozen and I had to restart it. Data taking stopped (when I restarted the computer - it was taking data locally while the wifi was off) and I restarted it, with the new filename anemometer_2022_DecA_2.db. The original anemometer_2022_DecA file was corrupted by the restart, but could be fixed with the command: 'sqlite3 old_file.db .recover | sqlite3 new_file.db'. This dumped the data in the corrupted file into a new file. I then renamed the new file to anemometer_2022_DecA.db

Summit internet access

Also, got Ali access to the summit guest wifi. Specifically, we had to fill out the onboarding form (from Diego):

This is the Summit Onboarding Procedure. Here you will find instructions to access various services in Rubin, including WIFI: https://ittn-045.lsst.io/

The onboarding form can be found here: https://project.lsst.org/visiting-the-summit/network-access

Dec. 8

Took fall training and lockout/tagout training in the morning.

Anemometer and Differential temperature sensor have been taking data pretty typically. Dome was cracked and closed throughout the day depending on the need of the two instruments being installed there.

See Ali's page for updates on the DIMSUM installation.

Dec. 9

See Ali's page for notes on DIMSUM.

Also talked to Patrick and he said we need hose clamps for the differential temperature sensor (which I will pick up over the weekend) and we need to clamp down or move everything else that could move in an earthquake. He said tape isn't okay because it peels off paint, which leads to rust. We'll have to coordinate with Craig to figure out the best way to do that.

Dec. 12

See Ali's page for notes on DIMSUM.

Made a Jira ticket for Ali's laptop to get added to the RubinObs-LHN wifi so he can vpn into the Mac mini.

Talked to Patrick about Parker's flat field illumination system. We tried to take some flats but they were not really properly ingested (issues with headers), and they were just in the red band, and Ali's headlamp was on for part of it. We will try to take a full set tomorrow before LATISS is warmed up so we can practice analyzing it.

Also looked at the PD + Keithley setup. Patrick got the Keithley working over the weekend, but the photodiode is probably wired up incorrectly (it's supposed to be set up for back bias, but there's probably a short). Will take a look when I have a chance.

Dec. 13

See Ali's page for notes on DIMSUM.

Attempted with Patrick supporting remotely to get the new AuxTel flat field illuminator working. Unfortunately, we had massive issues first with the CSC (not getting the arc lamp to turn on), had to switch to manual mode, and then had issues with the script creation for flat field, and we weren't able to solve all of them before I had to catch the bus. Patrick will work through them when he's back in the US, and we'll take flats when LATISS warms up again in January. However, I do now have credentials such that I can move AuxTel and the dome (and possibly the main telescope, I suppose).

Dec. 14

Photodiode

Worked on the photodiode readout setup so we can get a sense of how dark the dome is during the day. The CSC isn't configured to be able to produce a voltage yet, so we wired up the photodiode with the one Triax cable we had (a test one that has three banana clips) and clamped two of them (green and black) to banana clips going to the anode of the photodiode and the red one to the cathode, and taped them with electrical tape. This is a pretty janky setup. So I gave Kevin Reil the part numbers to order good Triax BNC adapters (Keithley 7078-TRX-BNC) and we will just use a BNC to connect the photodiode to those adapters when they arrive.

But with this setup and the CSC I read out continuously starting at 5:26pm until ~9:00pm in 30s intervals. 

I had to set the range to 2 mA because it was bright at the beginning. But here are the last plots (plotted every 6 minutes) before we had to close the shades at 8:51 pm because the sun had set.

After closing the shades the photodiode just read 0. When I changed the range to 2 uA, I got the following:

The notebook used for these measurements is called electrometer_for_ChrisW.ipynb

A few notes on the CSC:

1. It's not writing enough digits to the LFA
2. There are a lot of bugs in this CSC. It frequently has to be restarted or the Keithley has to be sent to standby and enabled multiple times
3. Not all the commands that are supposed to work work.

That said, I think once the new cable adapter comes in we can put this in the main dome and do readout and we will be able to figure out what the daytime background light level is.

Dec. 15

Helped Craig finish the installation of the insulation on the AuxTel chiller lines. LATISS is now back up and running.

Storage

Packaged up the sky spectrograph and put it in the container. Here is my extremely mediocre videos about what's inside (I have another but it's too big to upload), but really it's every component of OSELOTS (including fiber, laptop, power cables, camera, spectrograph components, fish lens and magnetic mount mount) and it's being stored in A04 in the container:

OSELOTS Storage

Dome-seeing instrumentation in the main dome

Had a less than five minute visit to the dome (because they were going to start TMA and dome movement soon) to take videos of where dome seeing instrumentation can go. I'm attaching the video here (unfortunately, it seems like at some point I accidentally turned the first video off so it's not complete, but hopefully this + the previous pictures are helpful):

Dome video one . Dome video 2

The main thing that I think is missing from the above videos that I meant to include are the baffles that will ultimately cover most of the dome and the catwalks and other struts that are on the dome.

General measurement notes

Restarted differential temperature sensor readings at 3:53 pm. Dome slit cracked for some time (people have been in and out all day). Opening vent window and turning on fan to 20 (unsure about units, probably Hz) at 3:55 pm. Also opened window 2 halfway.

Rod twanging

Craig was reluctant to use the twangometer (and we couldn't find the oscilloscope), but we did twang the centers of the 8 rods that hold M2 and we recorded the times so we can look at the accelerometer data from M1, M2 and the top of the lower right truss. The picture below shows the position of the telescope (elevation = 17 degrees) when we did the measurements, and the labels we use to denote the different rod locations. Note that the lower right side rods have cables attached.

We twanged on the minute, doing each rod twice. We can check the data in the EFD. The lower rods we twanged by hand and the upper rods we used a metal pipe to hit the center of the rod.

We can pull out data from the EFD using for example this notebook (from Craig): Accel_EFD_PSD_19Dec22.ipynb

Results, picked 5s after the twang, are here: twanging_notes_121522.pptx

Main results: 

Observations the night of Dec. 15

Did two types of observations. Took SHWFS data, particularly hfr videos, and also focus tests (AuxTel_Focus_Tests.pdf)

Details here: observations_121522.xlsx

We see a 19/20 Hz resonance frequency and a 60 Hz frequency in almost all cases on M2.

Dec 16

Anemometer back up and running (was taken down or observations last night because I needed the Mac mini):

Packed everything and took a video of our full inventory. It's too big to upload, but here is a photo of our four boxes of equipment, and all our stuff unpacked.

Storage Inventory

• 3 keyboards
• 3 monitors + cables to connect them to computers
• 3 computer mouse
• 1 Dell computer
• 5V and 12 V power cables
• 3 Chilean power strips
• 2 10 m Chilean extension cords
• Nasmyth port screws + 5 lb counterweight
• cables for connecting to the 3D anemometer and changing its settings + spare anemometer cable
• various usb to usb connectors
• many zip ties of different lengths
• 17 US-Chile power adapters
• high voltage clamps
• 1 short BNC cable
• 3 BNC to butterfly clip adapters
• 1 BNC T connector
• 2 sets butterfly clips
• twangometer (DVM + Arduino + cable + accelerometer + solenoid)
• 3 L clamps
• Kendo set of 6 pliers and wire cutters of different sizes
• 7-8 additional pliers and wire cutters
• 1 wire stripper
• collection of 1/4-20 screws
• collection of sma caps
• 3 extendable razor blades
• 2 metric and 2 imperial Allen key sets
• 2 packs of duct tape
• 1 roll of black masking tape
• 1 wrench
• set of screwdrivers
• scissors
• oscilloscope
• 3 DVMs + cables
• calipers
• 2 tape measures
• 1 ruler
• 2 camera bags
• ND filters
• polaroid macro lenses for Sony camera
• 3 packs of ziplock bags
• 1 thing of aluminum foil
• ZWO Asi camera
• Sony remote camera control
• 3 ball bearing camera mounts
• 1 c-clamp for camera
• 1 5 minute epoxy
• 1 set safety glasses
• 1 flashlight
• 1 sharpie
• 1 set drill bits
• 1 rechargeable 12V lithium battery
• 8 AAA batteries
• 8 AAA batteries
• 5 9V batteries
• 2 high voltage clamps(?)
• tool for tightening 2" optics
• tool for tightening 1" optics,
• lens cleaner
• ~ 2ft of optical tubes
• optical posts of various sizes
• optical post holders of various sizes
• lenslet arrays
• soldering station
• magnifying glasses
• heat shrink (but it seems pretty shrunk by the heat)
• spare Arduino for differential temperature sensor
• two circuit boards + wires and resistors
• spare 1 to 4 optical fiber (which may not work)
• spare 1 to 7 optical fiber
• halogen lamp
• 1000 W pure sine inverter 12 VDC to 120 VAC
• 1 SRS SR570
• mount for optical fiber collimator
• 3 tripods
• 1 HgAr calibration source
• 2 solar cell mounted
• little black tube that says UV on it
• white lamp that I don't know what it is
• something that might be a VNA, but I'm not sure