[Nakano, Kasuya, Enomoto]

Today we did the following preparation work for locking RefCav; re-ordering circuit boards as designed in the racks in PSL room, preparing cables to be used, applying voltage to EOM for RefCav lock and installing RF PD to detect the reflection of RefCav.

We were able to sucessfully observe the PDH-shaped error signal (that indicated the EOM and RF PD work properly), but the signal was too dirty due to bad mode matching so that we gave up trying to lock the cavity.

Next thing we are going to do is to reshape the beam profile by putting one or more temporary lenses to make the mode matichg ratio better.