The IR detuning map in elog2615 was concerned that it could be related with alignment control. Therefore, I try to clarify this concern here and do some related test.

How is the AA loop?

     As far as I found, the AA loop bring GR and IR transmission to top of TEM00. If I introduce pertubation to AA loop, GR power goes down, which means AA loop works well.

Why IR detuning map should not be related to AA?

    1. The IR detuning map in elog2615 should not be related to AA loop because the AA loop works to have a totally linear response as elog2650. But IR detuning map has a flat region.

    2. I took IR detuning spectrum with AA loop opened. Meanwhile, the AA error signals are put around zero by hand. The beam hitting position was chosen as elog2573 to old and new spot. Then I got two spectrums are the attached figure. The spectrum shows result as found in elog2573. Since AA loop is open, there should be not effect from AA loop.