[Tanaka, M Yamamoto, Sato, Komori]
We initiated the frequency scanning procedure to search for the resonant frequencies of ITMX.
Initially, we confirmed that we can excite the drumhead mode at 23.7548 kHz, which has already been identified.
This confirmation was achieved through the measurement of the transfer function from K1:SEN-ITMX_L_OUTF_EXC to K1:MIR-AS_PDA1_RF17_I(Q)_OUT_DQ during FPMI RF locking.
For this round of testing, we are focusing on two vertical-01-like mechanical modes at 23.73 kHz and 24.52 kHz.
The choice is based on the observation that the beam spot position on ITMX shifts vertically but remains nearly centered horizontally, increasing the likelihood of successful sensing compared to other modes.
We have set the scanning frequency range from 23 kHz to 25.5 kHz and started the diferential excitation in the pitch direction.
The measurement is expected to continue until 7 am tomorrow, and I will verify that it concludes as planned around that time.