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Message ID: 738     Entry time: Thu Jul 16 13:14:26 2026
Author: Cynthia 
Type: Update 
Category: Interferometer Simulations 
Subject: LIGO pre-figuring team meeting summary  
Pre-figuring meeting 7/14:

- the non-uniformity brought by annealing for ETM14 and 11 seems to be higher than expected, this meeting focused on discussing about annealing data for ETM014 and 11 : https://dcc-lho.ligo.org/LIGO-T2600213

    -we will receive more data for these, since there are some residual power left in the data/plots shown in the meeting because of the reference sphere, and the exact reference sphere radius is unclear

- reviewed the uniformity plot for HR ETM with TiGe coating again: https://dcc-lho.ligo.org/LIGO-T2600277

- not a lot of updates for ring heater: 40W delivered. Currently lock with 1.5W per segment on ETMy at LHO

- slides for HOM study for 250mW biased profile:

https://docs.google.com/presentation/d/1BWh_skxkCXBu_e_QkXkUs9CdvFIryu7H_jfpCgOenNg/edit?usp=sharing
https://docs.google.com/presentation/d/174XVLLpNpNgnL0uV-dSp6MO5pmZ9Yvnouf8V0LA2zE8/edit?usp=sharing

However, we did not focus on any surface profile related topics in the meeting so it was not presented

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