the MegaPrime cover...
||Various resolution downloads:
[Full scale - 960x1280 - JPEG
[Scaled 1/2th: 480x640 - JPEG
Here, the cover of MegaPrime has been lifted
up, and is still visible at the top of the picture. The two vertical boxes,
the front one labeled MegaCam, are the two controllers of the camera. Each
of them is processing the signals coming from half the CCDs of the mosaic.
The data are sent by fiber optics directly
to a PC-like computer located close to the observing room. The CCD mosaic
is inside the cryostat, the blue flat cylinder that can be seen under the
controller boxes. The braided hose leads to a vacuum pump: this picture
was taken while MegaCam was being prepared for its first ride on the telescope.
The small black cylinder seen just under
the cover is the motor of the rotating valve, which sends pressure waves
in the pulse tube used to cool the mosaic. The helium lines are the two
bigger black hoses just under the motor.
Glycol runs to many places, cooling all the
heat-producing components. When the cover is closed, the ambient temperature
underneath is kept close to the outside temperature; this eliminates any
heat exchange, which would produce turbulence in the light coming from
the sky into the telescope.
Credit line: "Canada-France-Hawaii Telescope
Copyright © 2003 Canada-France-Hawaii
Copyright policy and credits related to all press
All images on this page are to be used
the purpose of media announcements related to MegaPrime.
For any other use, please seek authorization from CFHT's PR
Any images used should be credited as follow: "Canada-France-Hawaii
Telescope / 2003"