Alexa, Sheila, Stefan

We made a little bit of progress in DRMI alignment today.

 - First we ran the SRY cavity, and commissioned a pointing loop from the ASC_AS_C quad to SRM and SR2.
 - We used M1 (top mass) actuation because we needed the range, so we switched both SRM and SR2 to MO angular actuation.
 - We then carefully tuned the output matrix such that we don't rely on the WFS to keep SR2 and SRM aligned relative to each other.
 - The output matrix is:
             SRM    SR2
    PIT     -7.08   1.00
    YAW      7.12   1.00
   Note that this matrix will likely change if we switch M2 actuation.
 - Then we successfully used this pointing loop in DRMI, even without any SRC WFS running.
 - The gains were H1:ASC-SRC2_Y_GAIN = 1, H1:ASC-SRC2_P_GAIN = 1, and the input matrix is also 1 (H1:ASC-INMATRIX_P_7_27 and H1:ASC-INMATRIX_Y_7_27).

 - Next we re-phased the AS 36 and AS45 diodes using a freely swinging Michelson. A snapshot of all four diodes is attached.
 - Then we started looking into the SRC WFS again:
 - After many failed trials, we noted that one of the biggest signals for the SRM is AS_A_RF36_Q. But we already used this for the BS.
 - However when driving the BS we found that it has a different demod phase: The BS signal is maximized for the mix
    0.89*I + 0.45*Q (all of AS_A_RF36). The same mix was measured for both PIT and YAW.
   Thus we switched the BS to this mix.
 - Finally, for controlling the SRM, we found two signals: AS_A_RF36_Q from before, and AS_B_RF36_I.
 - Because AS_B_RF36_I is more what I expected, I left the SRM on that one.


Not done yet: 
Adding all this to the Guardian.