For some reason, the peaks around 100 Hz has gone. It might be becasue the alignment work last a couple of days. Actually they are very 

However, we had some new issues:

• REFL camera has halo. This suddenly happend, after several lock after the alignment work. 
• DARM signal breathed a lot than before. Due to that the BNR is not really good as expected.
• New broadband bamps around 400 Hz which has a coherence with PRCL, although the roll-off filter into the PRCL servo does not improve the sensitivity. So, this might come from the frequency noise. As described above, the REFL camera has stragne image, and we are suspecting the clipping on the REFL table. That scattering contaminate the REFL45 signal used for CARM error signal. PEM team will investigate it.

I will investigate more after I come back with more energy. I guess these will improve our BNR a lot.