The instrument seen inside the thermally-controlled
chamber, whose temperature is maintained constant to within 0.01 degrees.
The four gray sheaths containing the 17-m long optical fibers coming from
the telescope arrive into the chamber at the top left.
The metal box at mid-left (partially hidden) contains the
scramblers for the high-resolution fiber set. The fibers (one blue, one orange
and two black) enter the spectrograph below center left.
The (golden) dewar holding the EEV 44-82 CCD (4102x2048 pixels)
has an autonomy of 48 h, but is refilled automatically every 24 h through the
black tubing at top left.
The constant-volume vessel seen in the background containing the dispersive
elements has been sealed and is filled with Nitrogen.
Its pressure is constant to within 0.01 mbar.
Light enters the vessel through the Schmidt corrector (held by the
black circular plate). See the
optical layout for more details.
The entire spectrograph is mounted
on shock absorbers and is directly supported by the telescope pier structure.
The instrument cover assembly has yet to be installed.