This afternoon Elli, Kiwamu and I phased the AS A 36  in PRX, then again in DRMI.  We phased each quadrant to minimize the Q signal with the cavities locked, and the WFS centered, and then adjusted gain to get the same size signal on each quadrant ( the gain adjustments are no more than 40%).  This seemed to indicacte that the electronics for each qaudrant are working OK, so nothing needs to be done durring the HAM6 vent.  However, after this we tried exciting the angle of the SRM and saw that the signals are still highly coupled between pitch and Yaw

The glitches described in alog 17576 are here again tonight.  In addition to the kind of intermittent glitches described in that alog we have verry regular 4 second glitches in DARM control when locked on ALS.  This started around 22:38 local time (5:38 UTC on April 3rd).  These large glitches cause the half hertz motion of the ETMX suspension.  Dan and I are leaving the IFO locked on ALS to see if these go away on their own overnight as the ALS glitches have in the past.

ETMX is swinging in pitch at the half hertz resonance, this is rung up by the glitches.  Oplev damping is not an option because the ETMX optical lever laser is dying, as we have known for several weeks now.