Daniel, Stefan With the PLL running reliably, I successfully handed off the mode cleaner control to the ALS COMM signal. - I copied all old HIFOY scripts in /als/h1/scripts/ into /als/h1/scripts/HIFOY_safe - I updated the CARM_down script and started working on the CARM_handoff script. - The initial part of the CARM_handoff script ran fine, and I was able to turn off the MC feed-back to MC2. - The CARM loop before engaging the AO path has a UGF of 20Hz - rather low, and the phase margin is questionable (0deg margin at 100Hz) - Then I noticed that CARM FM6 was an outdated filter, which needed to be updated for the new PLL. I added FM10 "shape", which is a z1.4:p1000 with the gain matching the previous filters FM6 and FM7. This effectively got rid of a p40:z7k - a filter that we now have in analog in the PLL. With that I increased the UGF to 90Hz. - I tried ramping up the AO path, but always lost it before I was able to measure the OLG. More work to be done there. Updates to the CARM_down and CARM_handoff scripts: - The MC2_M3_ISCINF_L FM6 used to be a z150:p500 lead filter for extending the actuation lead to 500Hz. I restored it. - We are now using H1:SUS-MC2_M3_LOCK_L FM9 instead of FM8. I adapted the scripts - Use CARM FM10 instead of FM6 and FM7. - I took all ARM HEPI feed-back engaging out of the script - that is handled by the ALS at the end station. - I took any reference to RFAIR_9 out of the down script.
Great. Now you can try the power-recycled X-arm.