Reports until 17:46, Tuesday 10 February 2015
H1 ISC
evan.hall@LIGO.ORG - posted 17:46, Tuesday 10 February 2015 - last comment - 19:08, Tuesday 10 February 2015(16613)
BS WFS using ASA36Q

Lisa, Peter, Alexa, Evan

We have closed WFS loops to stabilize the angular motion of the BS during full lock.

We looked at ASA36Q and ASB36Q while giving small steps to the BS angle. We found that ASB36Q responds with the wrong sign (i.e., if the BS step gives an improvement to POPAIR18 and ASAIR90, the ASB36Q signals move away from zero), so we aren't using it. ASA36Q has the right response, so that's what we're using.

In the ASC-MICH filter banks, we are using FM1 (-20 dB), FM2+FM3 (1/f shape everywhere), and FM10 (inverse BS angular plant). The gains for both pitch and yaw are 0.3 ct/ct. The time constants of the loops are about 1 s.

On the BS suspension, we are feeding back only to M2. M1 is off. We are leaving the BS oplev damping on.

Comments related to this report
lisa.barsotti@LIGO.ORG - 19:08, Tuesday 10 February 2015 (16615)ISC
Link 

We also closed Common Hard PITCH using REFL B 9I, with a gain of -20, same filters as DHARD (tentative ugf estimate = 200 mHz).
So, so far we have closed DHARD (PIT and YAW), BS (PIT and YAW) and CHARD PIT. We will post some plots later, but we saw some improvement in the sideband buildup, and  we have been locked for more than 3 hours without manual adjustment .