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⇤ ← Revision 1 as of 2018-07-31 11:28:29
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Size: 1776
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| Deletions are marked like this. | Additions are marked like this. |
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| * 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.. |
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| 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. == ISS == * ISS loop locked again. OLG or RIM was measured, and they are being analyzed. |
== 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. |
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== 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. |
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.
ETMX (Miyamoto)
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.
DGS
- DAC is almost out of stock. We should think to start using old DAC used in CLIO.
rack cleaning
Others
- Next meeting: 7/31.