Reports 1-1 of 1 Clear search Modify search
MIF (Noise Budget)
kentaro.komori - 2:14 Wednesday 26 July 2023 (26086) Print this report
O4a noise budget

[Yuzurihara, Washimi, Ushiba, Komori]

We created the noise budget for O4a using Pastavi.

https://dac.icrr.u-tokyo.ac.jp/KAGRA/DAWG/Detchar/klog/klog26086

The dominant noise sources are as follows.

- 10-60 Hz: Suspension local control noise (klog:25784). The control noises from SR3 and BS have been reduced by optimizing the feedback filter (klog:26016).
- 60-400 Hz: Sum of the acoustic noise from various locations (klog:25790). Some contributions from each location might be double-counted, leading to a possible overestimation.
- 400 Hz-1.5 kHz: OMC DC PD dark noise and the shot noise (klog:25787). 
- 1.5-7 kHz: Frequency noise (klog:25979).

The local control noise can be reduced by implementing better filters.
The acoustic noise improves with the square root of the input power if it behaves like a sensing noise.
To address the PD dark noise, cabling improvements are required (klog:25965).

Comments to this report:
hirotaka.yuzurihara - 5:57 Wednesday 26 July 2023 (26087) Print this report

Memo for future workers

  • The noise budget data which Komori-san used in the noise budget plot can be found on the noise budget catalog page.
    • Visit the page (requres the ICRR VPN connection) and look for `Noise budget (2023/07/26_00:06:41 JST)`.
    • You can download the numpy binary files containing the noise budget with a frequency resolution of 0.1 Hz.
tomotada.akutsu - 7:53 Wednesday 26 July 2023 (26088) Print this report

Great job! Thanks!

Search Help
×

Warning

×