M.Yamamoto,Nakano
As a test, We tried to excite an elastic mode of ITMX in a short time.
Happily, We find the resonance of ITMX.
We are currently exiciting the vibration at its resonant frequency and recording its decay time 10 times.
Q-value measurements will be completed around 21:00.
And We were going to scan of ITMX, but we won't do that work tonight.
Please don't touch IFO and k1ctr3 during the Q measurement (finish time is 21:00).
During this scan time, the following scan conditions were performed.
The confirmed resonant frequency was 23.75492 kHz.
Scanning conditions
Scan time: 18:13~18:40 JST(time: 1600 seconds)
Scan frequency span: 23.65325kHz~24.13kHz.
These scan conditions are similar to those of scanning with moku: lab in the past.
This indicates that if FPMI is locked even though the Q factor of the test mass is 1E+6, excitation may be possible in a short time with moku: lab.
To excite the resonance of the drumhead mode of the ITMX, the DGS settings were changed as follows.
①Change ITMX TM COIL driver from test port to drive port
1. VIS ITMX TM OLDAMP FILTER Y from -1.0 to 0.0
2. COIL TEST ENABLE on TM COIL DRIVER from 0.0 to 1.0
②Change Band-Pass-Filter of K1ASC-OMC_REFL_QPDA1_RF17_I1 and K1ASC-OMC_REFL_QPDA1_RF17_I2（maybe both)
Changed Band-Pass-Filter(duraction:23.65325kHz~24.13kHz)
The attachment figure is the excited resonant peak.
