[ChrisW, Stefan, Sheila, Kiwamu]

The power recycled half Michelson with ITMY, so-called PRY, was locked.

It is not so stable at this moment but it could stay locked for more than 10 seconds.

Alignment pf PR2 and PR3:

As advertised yesterday, indeed we were close to a good alignment. Although we got confused by the BS camera, we managed to find the fringe by steering PR2 with PR3 continuousely scaning in yaw by AWG at 0.3 Hz. The vertical alignment looked OK from the beggning and we had to mainly tweak yaw. Afte we found it, we simply maximized the amplitude of the REFLAIR_A_RF9 signals. Note that the spot motion looked quiet today as all the ISIs were on.

Locking settings:

sensor = REFLAIR_A_RF9_I (whose phase was adjusted to be 10.0 deg)

actuator = PR2

details = see the screenshot below

Mysteries and issues to be solved:

• Why PRM doesn't grab a fringe ?
  • Stefan measured the actuator to osem TF at M3 and the result was suspiciousely flat from DC to 10 Hz. Probably something is wrong.
• Turning off the ITMY ISI made the lock more stable.
  • ISI needs to be checked and tuned.