From Thursday's, it was found that the actuator contacts in the actuator
holes of the reference body showed significant oxidization where there were
problematic actuators.
On Friday, a
number of apparently good actuators were removed to check if that oxidization
was present there as well. Approximately
10% of them showed damage and extrapolating that to the complete shell means
that operational performance would be impacted.
Thus, the decision has been made to remove all the actuators, inspect
the contacts and clean where necessary. We should end up with contact
oxidization cleaned, distribution boards cleaned and remounted as well as
the astatic levers and cables etc.. at the end of the visit of our Arcetri colleagues (A. Riccardi and M. Xompero).
Reinstallation
of the actuators, component
checkout and reintegration of the shell, check out of all the
boards
and contacts,adjustment of the
membrane shim, installation of TS4 board
(currently in transit from Arcetri to LBTO), shell cleaning. shell
mounting to the reference
body, initial tests of reassembled
unit,
check-out of the AdSec unit
in the lab on the installation mount to verify system performance,
installation of the AdSec unit into the hub and
the hub back onto DX, alignment of the AdSec unit and calibration with
the 4D
interferometer to build a new interaction matrix, system alignment
calibration with
retro-reflector for both FLAO and LBTI systems, and on-sky commissioning
are some of the tasks to accomplish in the weeks to come. What a list!
Stay tuned as we walk this long road to recovery...
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