ligo-ex ligo-ds
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New entries since:Wed Dec 31 16:00:00 1969
ID Date Author Type Category Subjectdown
  623   Wed Aug 6 16:31:37 2025 Xuesi MaUpdate  

Date and Time: Around 4:20 PM on Auguest 6, 2025

Location and Temperature:

  • Back of the room 1119, around the working station: 90.2 °F
  • Front of the room 1119, around the doorway: 85.8 °F
  • Back of the room 1129, around the working station: 93.4 °F
  • Front of the room 1119, around the doorway: 82.3 °F
  • In the hallway in front of room 1119: 77.2 °F
  628   Tue Aug 12 13:32:43 2025 LiuUpdateInterferometer Simulations 
Differences in Fused Silica parameters.
  629   Tue Aug 12 13:46:56 2025 ChristinaUpdate  
  641   Tue Sep 9 12:01:38 2025 Tyler, MaUpdate  
Slides
  644   Tue Sep 9 13:08:44 2025 Xuesi MaUpdate  
Slides
  660   Thu Nov 13 12:39:01 2025 MaryUpdateInterferometer Simulations 
  671   Thu Jan 22 13:12:29 2026 MaryUpdate  
  681   Thu Feb 5 13:59:42 2026 MaryUpdateInterferometer Simulations 
  684   Thu Feb 12 12:59:29 2026 MaryUpdate  
  704   Fri Apr 24 23:55:50 2026 DhatriSummaryInterferometer Simulations 

[Sidd, Pooyan, Dhatri]
In the group meeting on 04/23/26, we discussed with Jon why we weren’t getting expected values for PRC Gain while running the current LLO model; specifically if there is mode mismatch. Worked more on this today.
  • Looked at the mode mismatch using cavity_mismatch_table().
  • Compared these finesse_ligo factory model mismatch values with those of the aLIGO katscript model.
  • The latter does not have the cavity_mismatch_table(), looked at both models' mismatch values using cavity_mismatch().
  • Ascertained that there is less mode mismatch in the katscript model (~10^-2) as compared to the factory model (~10^-6).
  • Mismatch values are starkly different, not just for (PRC, XARM) but also for others like (OMC, XARM).
Is the issue with the locking procedure?
  • Analysed the locking process for factory model and katscript model to find minor differences in the order.
  • Tried applying the katscript locking function to the factory model and still seem to get the same results. (to recheck)
  • Further directions/steps:
    • To compare radii of curvature of the optics in both models
    • Check q parameter at PRM and assign it to the laser to run the model
    • Generate powerup plots again and check against previous ones (with and without ring heater)
  •   721   Thu Jun 25 12:48:29 2026 Xuesi MaInfrastructureCleanroom 
      725   Thu Jul 2 13:26:16 2026 Abhiram SharmaUpdateInterferometer Simulations 
    Update on MCMC SURF project
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