Figure 10.
Data from the Gemini
South secondary mirror
sensors at the time of
the September 16th
earthquake.
secondary mirror system effectively acted as
a seismometer. Figure 10 shows the secondary oscillations in response to the early arriving P waves, followed some 20 seconds later
by the major shock of the main quake.
sulting work was released in the early part of
2015, and Dynamic Structures was awarded
the consulting contract in March.
Figure 11
(above, right).
A fully assembled,
spare shutter gearbox
at Gemini North.
Redesigned torque
arms are at the top of
the assembly.
Figure 12.
“Before and After”
images of
Flamingos-2’s
thermal background
in spectroscopy
mode, with the
baffle not correctly
in place (left panel)
and correctly in
place (right panel).
42
A Dynamic Structures team visited Maunakea in late April to review the shutter system
enclosure. They also took metrology data on
the arch girders and top shutter in various
positions.
July 2015
Guarding Against Future
Shutter Failures
Flamingos-2 Stand-down
Successfully Completed
As Gemini Observatory and its users are both
painfully aware, Gemini North lost a large
amount of time in 2013B and 2014A due
to two dome shutter failures. Since those
events, we have c