The lockloss due to the oscillation of IMC control could be seen in the recent lockloss investigation (klog33036, klog32903, klog32803). I implemented new label to tag the lockloss identify to the oscilation of IMC length control. The label name is IMCL.
In the some case, even though the 1Hz seismic motion is less than the threshold, the oscillation of the IMC control occured and it leads the lockloss. (Fig1) (Fig2) By adding this label, we can identify such loskloss.

I tested the function in local directory and by using the CAL_PROC guardian, Betweek 2024/09~2024/03/24, 323 lockloss were tagged with this label. I performed the eye scan for all the lockloss and confirmed that it works well. After the test, I added to SYS_LOCKLOSS guardian at 14:18.

I replaced the json files in /users/Commissioning/data/lockloss with the update json files. The old json files are stored in /users/Commissioning/data/lockloss/2025/__old/2025_0327_before_add_IMCL