KAGRA Logbook

Reports 1-1 of 1

VIS (IY)

takafumi.ushiba - 20:34 Friday 13 May 2022 (20724)

In-air health check of ITMY: Final check of the transfer function of each DOF

Abstract:
I checked TFs of all DOF at IP, GAS, BF, MN, and IM.
All TFs seem fine.

Detail:
I checked mechanical TFs from each DOF excitatio to each DOF signals at each stage.
Attached are the results (fig1 - fig26).

IPT to IPY coupling is larger than the other suspensions because decoupling was not yet done for ITMY because of the H2 geophone (ADC) noise (klog20197).
Also, MNP lowest resonant frequencies (0.87 Hz) are sightly higher than the X-arm suspensions' (about 0.75 Hz) but it doesn't seem a serious problem.
Other than above, there is no special remarks for the results of ITMY.

Images attached to this report

20724_1652440751_Screenshot from 2022-05-13 17-55-09.png

20724_1652440755_Screenshot from 2022-05-13 17-58-15.png

20724_1652440757_Screenshot from 2022-05-13 18-00-34.png

20724_1652440760_Screenshot from 2022-05-13 18-04-03.png

20724_1652440763_Screenshot from 2022-05-13 18-04-41.png

20724_1652440765_Screenshot from 2022-05-13 18-06-07.png

20724_1652440768_Screenshot from 2022-05-13 18-06-29.png

20724_1652440770_Screenshot from 2022-05-13 18-07-14.png

20724_1652440773_Screenshot from 2022-05-13 18-08-14.png

20724_1652440775_Screenshot from 2022-05-13 18-08-31.png

20724_1652440778_Screenshot from 2022-05-13 18-08-46.png

20724_1652440780_Screenshot from 2022-05-13 18-09-39.png

20724_1652440783_Screenshot from 2022-05-13 18-09-59.png

20724_1652440785_Screenshot from 2022-05-13 18-10-58.png

20724_1652440787_Screenshot from 2022-05-13 18-12-12.png

20724_1652440790_Screenshot from 2022-05-13 18-12-45.png

20724_1652440792_Screenshot from 2022-05-13 18-13-07.png

20724_1652440794_Screenshot from 2022-05-13 19-31-50.png

20724_1652440797_Screenshot from 2022-05-13 19-32-05.png

20724_1652440799_Screenshot from 2022-05-13 19-32-18.png

20724_1652440801_Screenshot from 2022-05-13 19-33-14.png

20724_1652440804_Screenshot from 2022-05-13 19-33-28.png

20724_1652440807_Screenshot from 2022-05-13 19-33-42.png

20724_1652440809_Screenshot from 2022-05-13 19-34-50.png

20724_1652440811_Screenshot from 2022-05-13 19-35-04.png

20724_1652440814_Screenshot from 2022-05-13 19-35-21.png

Comments to this report:

takafumi.ushiba - 15:17 Sunday 15 May 2022 (20731)

Measured data was stored at /kagra/Dropbox/Measurement/VIS/PLANT/ITMY/2022/05/