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2023 ?? ??, 1?:00 - 1?:00 2023 Aug 2nd, 15:00 - 16:00
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 1. Paper on coating (Mori, Nakayama): Ti doped (LIGO) and undoped (KAGRA) SiO2-Tantala stacks  1. Paper on coating (Mori, Nakayama, KYamamoto): Ti doped (LIGO) and undoped (KAGRA) SiO2-Tantala stacks
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  * no issue due to delay of pre-polishing since LMA is busy until the end of O4 on A+ coating
  * final polishing planned to start in march 2024 and last 12 months
 1. paper plan
  * commissioning paper on birefringence was merged with O3GK paper
  * birefr. exp setup + birefr. to internal stress paper under review
  * idea to merge simulation paper (by Haoyu) and methodology paper (by Aso) -> potentially almost ready (Haoyu-Aso)
  * idea to have a paper on Aztec crystal characterization (Marc-June Gyu)
  * idea to have a paper on eterodine AA with birefringence (Marc-Haoyu)

MIR Meeting on 2023/07/05 15:00 - 16:00

Participants: KYamamoto, June-Gyu, Marc, Sungho, Aso, Matteo

Next meeting

2023 Aug 2nd, 15:00 - 16:00

Minutes

  1. Paper on coating (Mori, Nakayama, KYamamoto): Ti doped (LIGO) and undoped (KAGRA) SiO2-Tantala stacks

    • coating thermal noise seems higher than expected value
    • internal review by coauthors being done at the moment
    • will be circulated to MIR subgroup in the next weeks
  2. Planned presentation of the measurements contained in the paper at the next LVK
  3. Measurement of Q-value for KAGRA sapphire mirrors
    • CARM-DARM as readout sensors, magnets as actuators
    • T= 80K for ETMX and T=250K for all the others
    • all Q value are between 1e4 to 1e5, seems low compared to expected value of 1e8
    • investigation of the reason of low Q ongoing, dissipation source is not clear
    • offline test on spare ETMs could be done to investigate the source of dissipation (Aso)
  4. report on polishing of new ITMs by Aso
    • Shaping, lateral flats and barrel done by ARD
    • pre-polishing and wedge will be done by Okamoto Optics (test polishing done successfully)
    • lead time of pre-polishing is largely increased due to necessity to avoid subsurface damage
    • no issue due to delay of pre-polishing since LMA is busy until the end of O4 on A+ coating
    • final polishing planned to start in march 2024 and last 12 months
  5. paper plan
    • commissioning paper on birefringence was merged with O3GK paper
    • birefr. exp setup + birefr. to internal stress paper under review

    • idea to merge simulation paper (by Haoyu) and methodology paper (by Aso) -> potentially almost ready (Haoyu-Aso)

    • idea to have a paper on Aztec crystal characterization (Marc-June Gyu)
    • idea to have a paper on eterodine AA with birefringence (Marc-Haoyu)

Agenda

  • Coating and Q-measurement update from KYamamoto
  • Polishing update from Aso
  • MIR related paper plan discussion

KAGRA/Subgroups/MIR/Meetings/Minutes20230705 (last edited 2023-07-05 16:33:02 by matteo.leonardi)