[Koji, Jenne]
The Yarm ASS is now working (as is the Xarm ASS). Both of the TT's pitch servos had a sign flip. We don't know why.
To start, we lowered the matrix elements that push on the TTs by a factor of 3, to compensate for the new factor of 3 in the slider gains: ezcastep C1:ASS-YARM_OUT_MTRX_5_5 /3 C1:ASS-YARM_OUT_MTRX_5_7 /3 C1:ASS-YARM_OUT_MTRX_6_6 /3 C1:ASS-YARM_OUT_MTRX_6_8 /3 C1:ASS-YARM_OUT_MTRX_7_5 /3 C1:ASS-YARM_OUT_MTRX_7_7 /3 C1:ASS-YARM_OUT_MTRX_8_6 /3 C1:ASS-YARM_OUT_MTRX_8_8 /3
We turned off all 4 tip tilt ASS servos (in the Yarm ASS servo screen), and turned them on one at a time. By doing this, we discovered that the pitch servos for both TT1 and TT2 needed to have the opposite sign from what they used to have. However, the yaw servos kept the original signs. It really doesn't make sense to me why this should be, but this is the way the ASS servo works. We left both Xarm and Yarm ASSs on for several minutes, and saw that they didn't push any mirrors out of alignment.
The ASS_DOTHER_ON burt snapshot has been resaved with the new values.
Also, earlier this evening, I aligned the Yarm green beam to the cavity, although the cavity was not optimally aligned, so this needs to be re-done.
On our to-do list should be to add the tip tilt slider values to the DAQ channels list. |