I attempted the scan for ITMY. This time from 23.3 kHz to 24 kHz, I increased the number of the measurement points from 500 to 1400. And also, yesterday I forgot to turn off the whitening filter of the HP coil driver. So I turned off the filter during the scan.

Fig. 1 shows the result. One elastic mode of ITMY was found at 23.756 kHz but the peak height was very low. Therefore, the cause of yesterday's results is that the excitation was too low by engaging the whitening filter.  I confirmed this peak could be excited at 23.756 kHz. So this peak seems to be one of elastic modes. Unfortunately, Other peaks could be not found.

Tonight, earthquake occured nearby Hokkaido. I gave up today's work. Tomorrow, I tried to perform the ringdown measurement of this mode and to scan the other suspensions.

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Note

This afternoon, during the PR3 recovery, I and Ikeda-san added the DQ channels (K1:MIR-AS_PDA1_RF17_{I,Q}_OUT_DQ). Thanks to this, we can perform the ringdown measurement automatically by using the previous script.