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Size: 2160
Comment:
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Size: 1927
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 22: | Line 22: |
| * UGF is currently 10kHz. Above 1kHz, suppression is not enough. It will be limited to 50kHz max in future by AOM driver. | * UGF is currently 10kHz. Above 1kHz, suppression is not enough. It will be limited to 50kHz max in future by a commercial AOM driver of speed of variable attenuator.. |
| Line 25: | Line 25: |
| MZ alignment is being proceeded, and MC has been already locked with single arm of MZ. * Mode matching ratio is still bad but it will be fixed soon. |
== Check list for IXC == * Meeting will be assigned on one of 8/15,16,17. * WAB, NAB are the additional items. * Mirror position should be in the item list. * WAB PD will be installed at the sometime. * The number of opening flange should be minimized. It must be listed up. * Oplev of ITMX will be installed. * Safety for high power laser must be considered. |
| Line 28: | Line 35: |
| == ISS == * ISS loop locked again. OLG or RIM was measured, and they are being analyzed. == IMMT2 (Ohishi) == * On 7/9, we started take IMMT out from the chamber. * All the replacement of magnetized screws is done by the end of last week. * Mirror position (distance between mirror and coile) was shifted a ~mm, probably caused by tilt of optical. * TF will be measured soon. == ACC noise == * Old circuits are still used in TAMA era, and all the noise floor are high. |
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| Line 45: | Line 38: |
| == Geophone == * To fix BS GeoPhone, we should open the chamber. * TMS GeoPhone looks fine, but some strange coupling can be seen in the TF measurement. * Feedback bandwidth is limited ~10Hz. |
* Oplev power goes down with switch of cryostat. * Also ETMX QPD shows 1/10 or lower power in 10 hour without relationship of switch of cryostat. One of the viewport looks dewed. * One of the motor seemed to be stuck. * F2 of ETMX fell bistable point, and it is stuck. |
| Line 54: | Line 45: |
| * DAC is almost out of stock. We should think to start using old DAC used in CLIO. |
Minute of KAGRA commissioning meeting
- Date: 2018/7/24 11AM~12PM
- Attendance: Miyakawa, Aso, Enomoto, Yokozawa, Kozakai
- eZuce: Miyoki, Suzuki, Nakano, Shoda, Ushiba, Yamamoto, Kimura, Uchiyama
LAS (Nakano)
- 40W laser started working on last Friday.
- Limite 1W will be used to alignment or so.
- Remote desktop will be installed on Windows PC for 40W laser control.
- Monitor of laser power should be displayed on door or something.
PSL, IOO
- MZ of single arm mode matching is much better now. No Lager-Gaussian is seen.
- MZ contrast is 99.4% and 96.9%. Second one has 3m arm length difference.
- Lock wil be tried soon. Common mode servo will be used to control MZ.
- RAM(residual amplitude monitor) monitor will be installed.
- ISS TF model and measurement were done. Model still does not have phase delay at high frequency.
- RIN is limited by PD dark noise up to 1kHz. Shotnoise is almost comparable.
- UGF is currently 10kHz. Above 1kHz, suppression is not enough. It will be limited to 50kHz max in future by a commercial AOM driver of speed of variable attenuator..
Check list for IXC
- Meeting will be assigned on one of 8/15,16,17.
- WAB, NAB are the additional items.
- Mirror position should be in the item list.
- WAB PD will be installed at the sometime.
- The number of opening flange should be minimized. It must be listed up.
- Oplev of ITMX will be installed.
- Safety for high power laser must be considered.
ETMX (Miyamoto)
- Oplev power goes down with switch of cryostat.
- Also ETMX QPD shows 1/10 or lower power in 10 hour without relationship of switch of cryostat. One of the viewport looks dewed.
- One of the motor seemed to be stuck.
- F2 of ETMX fell bistable point, and it is stuck.
DGS
rack cleaning
Others
- Next meeting: 7/31.