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MIF (General)
masayuki.nakano - 5:13 Thursday 18 July 2019 (9560) Print this report
GRX auto alignment

I implemented the auto alignment guardian. The name is ADS guardian for now.

So far, it only works for the GRX. If you chose the ALIGN_GRX state, it align the GRX automatically. The attached figure shows the auto-alignment.
It try to center the beam position on the test masses and align the injection beam to the cavity axis. So far, we don't have the channel for the input test mass beam position, so it only actuate the ETM. And also, because the actuator for the injection beam is only PR3, so it can align only one DoF. But I think it's enough so far.

==== Notes =====

For GRY, the beam position centering does not work so well. And actually, GRX beam position loop is also not very stable, and if it too far away, the mirror goes far more. So, it might not be good to use the beam position centering loop for the automation but just using the dither alignment also for the test masses.

Images attached to this report
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