(Log on the 7th.)

I measured the TFs of the folded pendulums in the FLDACCs. The TFs measured before the installation in 2022 show resonant frequencies of 0.2, 0.3, and 0.3Hz for H1, H2, and H3 respectively (Fig.1). The resonant frequency of H1 did not change, but that of H2 and H3 shifted to 0.8 and 0.5Hz respectively (Fig.2). The condition of the counterweights on the pendulums might have changed due to the Noto earthquake. The Q of H1 and H3 became slightly higher. It may be due to the vacuum environment.