We performed the OLTF and the optical gain measurement from yesterday night till this morning.
[Preliminary result]
* yesterday night measurements
- Vpp/2 ~ 6300cnt (see attachement 1)
- Optical gain: C ~ 6300 * 4 * pi / lambda = 7.44e10
- UGF of MICH OLTF, G, is around 35Hz (see attachment 2)
- Actuator efficiency from A = G/CD is 1.14e-11/f^-2 (roughly 3.1dB larger than the result in the 1st day)
* this morning measurements
- Vpp/2 ~ 7600cnt (see attachment 3)
- Optical gain: C ~ 7600 * 4 * pi / lambda = 8.98e10
- UGF of MICH OLTF, G, is around 50Hz (see attachment 4)
- Actuator efficiency from A = G/CD is 1.21e-11/f^-2 (roughly 3.7dB larger than the result in the 1st day)
[Time table (May 5 night - May 6 morning)]
22:16-22:27 Optical gain measurement by free-swinging Michelson (unlock)
22:27-22:40 OLTF measurement by swept sine injection (lock w/o calib. line)
22:40-22:42 Reference of calibration line measurement (lock w/. calib. line)
22:42- 22:51 Optical gain measurement by free-swinging Michelson (unlock)
26:04-26:17 OLTF measurement by swept sine injection (lock w/o calib. line)
08:15-08:23 Optical gain measurement by free-swinging Michelson (unlock)
08:23-08:35 OLTF measurement by swept sine injection (lock w/o calib. line)
08:35-08:40 Reference of calibration line measurement (lock w/. calib. line)
08:40-08:51 Optical gain measurement by free-swinging Michelson (unlock)
