Some discovery about local control

Unfortunately, last week some staffs of NAOJ came to take video between the bench and PR chamber misaligned the green path, so it took us some time to realign everything. But luckily after the realignment, the AOM efficiency now reached around 85%.

For the local control,while I was trying to change the matrix things, I tried again to test each magnet. It seems that the third magnet of PR which we thought it was lost, response to the noise very well. Then I test the magnet of the input, there is really one of the magnet lost. I am not sure what causes the no response of the PR magnet, the things I have changed is just the red beam position on all the aluminum mirror.

Yesterday I adjusted the PR local control again, so then I need also change the PSD angle, now the value is -0.045.

Also I rethought about the order we did everything, the reference was put after we realign the cavity by moving the picomotor. And after that we installed the AOM and the lenses, according to the reference we put on the bench and outside the PR chamber, now we already has the same alignment as before.But the range we can move the PR mirror is not large enough to put back the beam on the reference outside the BS chamber, which means also the PR range got smaller. The control of the PR and BS mirror was written in the same VI, so now I am a little bit suspect the program, but I am not able to check it in Labview.

There are something I cannot understand, should discuss with Eleonora later. The PR error signal has been put near 0 in both direction, when put offset of yaw at 0.9, the correction is -2.77, and if put offset at 1, the correction will suddenly saturate. For the BS, also for yaw if the offset is larger than 2, the correction signal looks like pulse.(pic 2)