[Yuzurihara, Kambara, Michimura]
We have setup the REFL table. The table was fixed close to the IFI chamber and optics are installed (see attached photo). REFL optics consist from a periscope, a lens (f=300 mm), a 50:50 BS, and a DC PD(Thorlabs PDA100A). Half of the beam is currently damped (we can use this for a camera).
The output of the REFL DC PD is connected to the Anti-Alias Chassis in channel IN 9 for ADC 0.
The REFL beam from the X arm show some striped pattern (see attached photo). We are not sure where this comes from, but I guess it is from beam clipping somewhere. The DC PD at BS was already removed.
Next:
1. Measure the power at REFL
2. Modify LSC model to include REFL DC PD.
> The REFL beam from the X arm show some striped pattern (see attached photo)
One thing the beam pattern reminds me is that the transmitting light through the IFI that was clipped by the IFI...