Hannah, Stefan

We were investigating some noise in the 70-100Hz range. Following up with Gabriele's alog (19756) we decided to check the RF36 channels and their coherence with the OMC-DCPD. ASC-AS_A_RF36_I_PIT and ASC-AS_B_RF36_I_YAW do appear to have some increased coherence in this range, but they also have a broadband coherence from 100 to at least 900Hz. We're still working to find a theory to explain this.

There are also some peaks in the coherence between PSL-ISS and the OMC-DCPD. However, the AS RF36 channels do not seem to correlate with peaks in intensity noise, suggesting some other source of noise.

We will investigate the higher frequencies during the next lock.