Late elog: Original time of work Tue Aug 17 20:30 2021
I locked the arms yesterday remotely and tried running runASS.py scripts (generally ran by clicking Run ASS buttons on IFO OVERVIEW screen of ASC screen). We have known for few weeks that this script stopped working for some reason. It would start the dithering and would optimize the alignment but then would fail to freeze the state and save the alignment.
I found the caget('C1:LSC-TRX_OUT') or caget('C1:LSC-TRY_OUT') were not working in any of the workstations. This is weird since caget was able to acquire these fast channel values earlier and we have seen this script to work for about a month without any issue.
Anyways, to fix this, I just changed the channel name to 'C1:LSC-TRY_OUT16' when the script checks in the end if the arm has indeed been aligned. It was only this step that was failing. Now the script is working fine and I tested them on both arms. On the Y arm, I misaligned the arm by adding bias in yaw by changing C1:SUS-ITMY_YAW_OFFSET from -8 to 22. The script was able to align the arm back.