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AdV-DET (Commissioning)
mwas, gouaty - 10:27 Thursday 15 November 2018 (43584) Print this report
DET_MAIN stuck after too many trials of shutter closing on MICH fringes
Figure 1, this morning the DET_MAIN automation tried repeatedly to close the slow shutter on MICH fringes, after the ITF unlocked from recombined while the slow shutter was closing.
After several attempts the logic safety properly kicked in and moved DET_MAIN to the UNSAFE_B1p dead end state.
To get out of this dead end state DET_MAIN needs to be reloaded, added a notification in DET_MAIN so it tells that the node needs to be reloaded to get out of this state.

A solution proposed a month ago, is for ITF_LOCK to request DET_MAIN to go to ENABLE_B1p instead of SHUTTER_CLOSED whenever it is locking the arms or recombined.
I have added corresponding lines in LOCKING_ARMS, LOCKED_ARMS et LOCKING_RECOMBINED and and reloaded ITF_LOCK around 09:15 UTC. Hopefully they will fix this issue and not cause other issues.
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