aLIGO LHO Logbook

H1 IOO (GRD)

daniel.sigg@LIGO.ORG - posted 19:04, Thursday 24 May 2018 - last comment - 18:49, Monday 04 June 2018(42183)

IMC WFS offloading guardian state created

Craig, Jenne, Shelia

I altered /opt/rtcds/userapps/release/ioo/common/guardian/IMC_LOCK.py such that the OFFLOAD_MCWFS guardian state should now hopefully do it's job. This is slightly more difficult for the IMC WFS because we have to deal with offsetting the steering PZT correctly.

We do the same offloading as normal for MC1, MC2, and MC3. For the PZT we hold the filter module output, change the offset, clear the history (including the input), then unhold the output. If this breaks the IMC locking scheme, you can comment out the new guardian state and uncomment the old one directly below it.

Comments related to this report

craig.cahillane@LIGO.ORG - 18:49, Monday 04 June 2018 (42319)

Link

Gabriele and I tested the OFFLOAD_MCWFS guardian state, it works without unlocking the IMC.
I also made another requestable guardian state called MCWFS_OFFLOADED. 
The guardian graph looks like LOCKED --> OFFLOAD_MCWFS --> MCWFS_OFFLOADED --> LOCKED.