Violin mode Q value measurement with IFO

• Background and condition

  • All sapphire suspensions are currently in the warm-up phase, and we aim to identify and monitor the Q factors of the sapphire fiber violin modes during this period. However, due to several issues, the interferometer had been unable to maintain a stable lock for most of the time. In klog35824, the interferometer achieved a stable lock for ~2000 seconds, providing a rare opportunity to analyze the violin modes.
  • Using the data obtained during this lock stretch, we performed an estimation of the Q factors.

• Data Information

  • GPS time: 1449401153 ~
  • Data length: 2048 s
  • FFT length: 512 s

• Result

  • Compared with previous measurements, the shorter integration time resulted in many fitting failures, and the number of automatically detected peaks was relatively small.
  • The peaks that were successfully fitted appear to have Q values on the order of 10^5.
  • The temperature
    • (IX, EX, IY, EY) ~ (91, 56, 58, 64) [K]
  • Detailed report with fit results: link