Today we performed some activities for the optical characterization of the arm cavities. 

1. IMC unlocked for five minutes to have the offset of PDs.

2. IMC locked, PD shutter closed, to compare with the situation list in 1.

3. Arm cavities RTL measurement (SDB1 drift control off, PR misaligned). Lock--unlock--misaligned--unlock--lock, following this order, we repeated 5 times for each arm.

4. Single bounce measurement for both arms.

5. Only one arm aligned and locked at a time for 5mins.

6. FSR scan by shifting the green laser frequency, we moved the Carm offset from -120kHz to 120kHz in order to have two FSR per scan. Every scan lasted 1 min. This scan was performed 20 times.

7. FSR fast scan, Carm offset from 120kHz to 0 in 30s.

8. Shift the frequency of the green laser to have the cavity out of resonance of any infrared peak.

All the GPS time of above activities are listed in the attached pdf file, we will analyze the data soon.