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| Deletions are marked like this. | Additions are marked like this. |
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| * moving peaks exist, but amplitudes are not so high and frequency is far from controls. -> accept * 2nd graph shows some bumps or moving peaks exist. * 3rd graph shows it can be removed when evacuated. -> accept |
* Moving peaks exist, but amplitudes are not so high and frequency is far from controls. -> accept * 2nd and 3rd graph shows it can be removed when evacuated. -> accept, we should check it after the pump down. |
| Line 29: | Line 28: |
| * F0 is close to the edge, so the gain is high. -> accept * F1 is within the range enough, we have no explanation for why the gain is so high. The reason for the dip of 8Hz depends on coupling, the earthquake might change the coupling. 1.6Hz peak showed in the new data, but we do not know why. However, no control is applied, so -> accept |
IYC Recovery(20240407)
- Suspension health check (Takahashi, Ushiba)
- A01: Cable check
- Re-cabling of BF damper
- A02 Porality Check
- Magnet gluing
- A03 Rubbing Check
- judge by the transfer functions
- A04: Range and Calibration
- A05: Watchdog Setting: Skip
- A06: Height Measurement
A08: Calibration:skip
- A09: Spectrum(spectra of IM/MN photosensors.)
ITMY IM/MN photosensors: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29140
ITMY tower sensor: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29141
Moving peaks exist, but amplitudes are not so high and frequency is far from controls. -> accept
2nd and 3rd graph shows it can be removed when evacuated. -> accept, we should check it after the pump down.
- A10: Transfer Function
Transsfer function : https://klog.icrr.u-tokyo.ac.jp/osl/?r=29138
EQ stop: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29087
F0 is close to the edge, so the gain is high. -> accept
F1 is within the range enough, we have no explanation for why the gain is so high. The reason for the dip of 8Hz depends on coupling, the earthquake might change the coupling. 1.6Hz peak showed in the new data, but we do not know why. However, no control is applied, so -> accept
- A01: Cable check
- Oplev Check (Yokozawa, Akutsu)
path check: https://klog.icrr.u-tokyo.ac.jp/osl/?r=29098
- Green flash at REFL and Trans PD
- Windows Cleaning
Tcam (Yokozawa and ChenDan, and Yamamoto)
- Baffle PDs (Yokozawa and his selected persons):
- NAB, WAB (Akutsu)
- Vacuum system (Kimura-san / Uchiyama-kun and their selected persons)
- Nasty air parts were replaced.
- Vacuum alert recovery after pumping down.
- GV interlock will be tried after pumping down.
- N2 purge is necessary for IYV.
- Cryo-system (Kimura-san and his selected persons)
- All temp signals are obtained?
- Cryocon alert to slack after cooling.
- No interlock for TMP around the Cryostat.