TMS Meeting Minutes, April 7, 2022

Attendees: Andrew, Breann, Christian, Heejoo, John, Olga, Trenton, Yang (Zoom Meeting)

Thermal Mirror Deformation Discussion:
  • (missed the start b/c I spaced)
  • Andrew to put together a step by step process for data collection and reduction for thermal mirror analysis
  • Plans to hand off to Heejoo and Trenton
  • Request by Andrew to add another switch to TMS for enabling active correction while the mirror is dropped -0.8 mm (during VFAST Extra)
Logistics for Tomorrow:
  • Lunch provided by LBT to local Tusconans
  • Transportation to Steward is squared away for all parties
  • The morning talk is an overall general talk, deep dive discussions after that
  • Do a headcount to figure out who all is planning to go up the mountain (roughly 10 from GMT +
Logistics for Saturday:
  • Heejoo was able to rent a suburban from motor pool, though he can only seat six, as the passenger airbag is out
  • Considering driving from a central point, possibly at Steward
  • Andrew has a cool rental car, so he is happy to drive people to base camp
Introductory Presentation
  • Andrew feels that there are lots of people at GMT who are unaware of how beneficial this collaboration is
  • Though this is an informal collaboration, it's a crucial collaboration
  • Emphasis on the symbiosis between the parties, which is why it works well
  • Particularly crucial as the leadership of LBTO is changing soon
  • John pointed out that TMS is now nearly operational and we are moving along to extended goals
Active TMS Nights:
  • Really nice data!
  • Except for the 1 jump per night due to mode3 pointing
  • There were a few problem situations, such as a power bump which dropped the primary
  • Heejoo claims that if we fully lock down the collimator mounts, there shouldn't be a problem with a drop
  • Andrew remarks that we really need to reduce the cases of poor alignment causing low intensity on channels
  • Etalon has a new, higher powered system that could help solve this problem, but we would have to conduct stray light testing again
  • Andrew notes that there are cases when you can see turbulence in a bigger beam but not in a smaller beam, which is a case against bigger collimators despite their reduced sensitivity to misalignments
Primary Mirror Hitting Limit:
  • TMS has been driving the primary mirror to hit the limit at the very start of the night
  • TMS script allows TMS to make corrections when dome is closed to do daytime tests
  • Operator moved to 30 degree elevation to open the dome
  • TMS sent a correction when the mirror arrived, and TCS sent the moed3 pointing offset, both adding to a 5.4 mm Z motion, well past the 3 mm limit
  • John has now added a check in the script to ensure that this kind of thing doesn't happen
  • There's a lot to be said about the value of prototyping
  • John and Matthieu fixed a 50 arcsec misalignment bug in TCS

-- TrentonBrendel - 07 Apr 2022
Topic revision: r1 - 08 Apr 2022, TrentonBrendel
This site is powered by FoswikiCopyright © by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding Foswiki? Send feedback