[Miyoki, Enomoto, Sugimoto]

Yesterday we started installation of fiber noise cancellation optics for X arm side.

=What we did=

We replaced the staring mirrors to PZT mirror and PBS just before the fiber coupler in PSL room.

First figure is time series of transmit beam after pickoff mirror in POP table.

We recovered the almost same amount of the beam at POP table as before installation.

After that, we put retro mirror after pickoff mirror in POP table, and detected the return beam in PSL.

Beam power was about 10~30uW( Shown in 9803 first figure).

We plan continue this work next weekend.