Chile/Summit Setup

History Log

Sep, 12, 2024

We spent two days/night working with the twilight monitor on the summit. Stubbs brought the ioptron mount, the photodiode and the tripod to the summit. There were an electrometer with the Camera team.

First Day:

• I had issues setting up the summit keysight electrometer. This issue was solved by writing a usdev rule.

• The instructions for setting up a key sight electrometer were updated on the wiki page.

• A failed attempt to implement an asynchronous script to measure the mount position while acquiring the electrometer data.

• Mount: script to slew up in elevation, stop in five positions along the way, then slew to the right in azimuth, slew down in elevation, and take five measurements. Each slew had a fixed period, e.g. 5 sec.

Second day:

• Mount: The script starts at Alt=80deg and slews down for four points. Then, it comes back to Alt=80 and slews down again. I improved the algorithm by moving to a given alt and az.

• The mount resets the zero point after the second consecutive slew. The function goto_elevation estimates the slew time and re-iterates up to the desired position.

• I could map the room using the first day method of slewing to a given slew time. The slew speed was not constant.

• TBD (observation)

Lessons learned about the mount

• Slewing for a fixed time is not repeatable. The mount does not always come back to the same position.

• The zero-point can be reset when I slew with the goto_elevation function. The reason is still unknown.

• There is a delay after stopping the mount that should be quantified.

• The async code is actually harder than I thought I should make a simple algorithm.

Lessons learned about the electrometer

• TBD