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← Revision 4 as of 2025-04-22 11:42:49 ⇥
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| Deletions are marked like this. | Additions are marked like this. |
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| Participants : | Participants : Y. Aso, M. Eisenmann, M. Otsuka, B. Park, S. Singh, H. Wang, K. Yamamoto |
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| * Polishing * Coating choice |
* Polishing : Wedge correction on-going at Okamoto (up to ~4/25) Nikon to do fine polishing up to end of March 2026 In total about 3 months delay + contract update on-going * Coating choice : question is with or without Ti doping (LMA can do both) initial schedule was to send crystal to LMA around February 2026 updated schedule : skip Q measurement (lack of person-power + high risk activity + low-Q likely due to bonding etc..) final schedule depends on polishing schedule + LIGO coating delay but likely 3 months delay aswell (coated ITMs delivered around end of August 2026) |
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| * Q mmeasurement | |
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| * Birefringence measurement | check of cleanroom cleanliness on-going Miyoki-san approved to lend KAGRA's HQ particle counter now delivered at Toyama U. cleaning planned up to ~ May 2025 |
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| * Absorption measurement | * Q measurement : Sato-san left Toyama U. after completing Master thesis Watanabe-san stays at Toyama U. for Master and will work on Q measurement at room temperature priority of cryo group is sapphire Q not bulk Q * Birefringence measurement : paper accepted now measuring sapphire at 1064nm at NAOJ trial sapphire measurement at 2um at UWA LMA might be able to measure TWE of sapphire to reconstruct birefringence * Absorption measurement : calibration of PCI at KASI on-going planned calibrated samples exchange should be able to measure up to 100kg and could upgrade to 1550 and 2000nm |
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| * Next meeting | * Next meeting : Wednesday 23rd 2025 16h JST |
Participants : Y. Aso, M. Eisenmann, M. Otsuka, B. Park, S. Singh, H. Wang, K. Yamamoto
Agenda :
- FY2025 activities
- ITMs preparation
- Polishing :
Wedge correction on-going at Okamoto (up to ~4/25) Nikon to do fine polishing up to end of March 2026 In total about 3 months delay + contract update on-going
- Coating choice :
question is with or without Ti doping (LMA can do both) initial schedule was to send crystal to LMA around February 2026 updated schedule : skip Q measurement (lack of person-power + high risk activity + low-Q likely due to bonding etc..) final schedule depends on polishing schedule + LIGO coating delay but likely 3 months delay aswell (coated ITMs delivered around end of August 2026)
- Bonding preparation
check of cleanroom cleanliness on-going Miyoki-san approved to lend KAGRA's HQ particle counter now delivered at Toyama U. cleaning planned up to ~ May 2025
- Q measurement :
Sato-san left Toyama U. after completing Master thesis Watanabe-san stays at Toyama U. for Master and will work on Q measurement at room temperature
priority of cryo group is sapphire Q not bulk Q
- Birefringence measurement :
paper accepted now measuring sapphire at 1064nm at NAOJ trial sapphire measurement at 2um at UWA LMA might be able to measure TWE of sapphire to reconstruct birefringence
- Absorption measurement :
calibration of PCI at KASI on-going planned calibrated samples exchange should be able to measure up to 100kg and could upgrade to 1550 and 2000nm
- Next meeting :
Wednesday 23rd 2025 16h JST