[Akutsu, Ushiba with help of Miyo]

Abstract:
GreenX reached Xend again and we tried to align ITMX but not yet finished.

Details:
To recover the Green beam alignment into Xend, we first checked the current green beam position at PR2 and PR3 by using targets which are used in the klog17190.
After confirming the beam position is not so bad, we aligned PR3 and then found the green beam is exsisting at Xend.
The OpLev values are almost (PIT, YAW)=(0,0) (see attached figure), which are the same values we saw the beam at Xend in the previous time, 2 weeks ago (klog17220).
That means OpLev is a very good reference at least 2 weeks order long. That's really nice!!

After green beam reached Xend, ITMX alignment was started to obtain the reflection from ITMX at POP table as a reference to GrRFPD.
During the work, we found that the ITMX YAW inclination is far from the good angle and it is difficult to rotate the mirror by only using coil-magnet actuators on BF.
So, we tried to use BF YAW picomotor but failed due to the trouble of picomotor drivers, and therefore finished alignment work today.
To use picomotor, it is necessary to turn off the picomotor driver once and turn it on again.
This is the first thing we wil do tomorrow.