CFHT operating manual - Homepage Usask
CFHT operating manual - Homepage Usask
CFHT operating manual - Homepage Usask
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<strong>CFHT</strong> Observatory Manual - Observatory (Sec.5) http://www.cfht.hawaii.edu/Instruments/ObservatoryManual/CFH...<br />
At login the Session Manager and the Feed Back windows appear<br />
automatically. The Session Manager window contains a set of buttons<br />
which has been tuned to the particular instrument configuration. When<br />
an item has been selected (click) a "forms" window will appear.<br />
Forms are the main way to communicate with a program. They, for<br />
instance, allow writing parameters in text input fields (such as the<br />
integration time for a CCD exposure) and deciding actions through<br />
checked boxes (e.g., click the ACCEPT push button will to begin a CCD<br />
exposure). For actions that take a long time (CCD integration, filter<br />
wheel movement, etc.) a visual icon will appear on the screen to identify<br />
the state of that resource or program. These icons go away when the<br />
action is completed.<br />
The "feedback" window contains a stream of output messages from the<br />
action taking place, each action being a separate program which starts<br />
up, does its work, and then dies. This allows writing UNIX or IRAF<br />
scripts to manage sophisticated observing situations. It is also possible to<br />
use normal UNIX command interpreters to run any of our programs<br />
providing terminal access as well as our normal windowed environment.<br />
Instruments<br />
Prime Focus Environment with the WFC and MegaCam - MegaPrime<br />
The new prime focus upper end (PFUE) has been designed at <strong>CFHT</strong> with the help of<br />
INSU-Division Technique: a new base ring, a new set of spiders, and a prime focus<br />
base which will receive all the other components of MegaPrime. The PFUE has been<br />
built on the West Coast of the USA by L&F Ind.<br />
In addition to its basic structure, the PFUE provides a temperature controlled<br />
environment for MegaCam and its readout electronics. A temperature controlled<br />
enclosure for the electronics of MegaPrime is installed on the telescope "caisson<br />
central" .<br />
The Wide Field Corrector (WFC)<br />
The parabolic main mirror of the telescope alone does not produce a<br />
good image of the whole field of view, and so a WideField Corrector<br />
(WFC) is installed in front of the camera.<br />
The WFC has been designed at HIA (Victoria, Canada). The lenses have<br />
been fabricated by SAGEM/REOSC, which also built the mechanical<br />
structure of the WFC and coated the lenses.<br />
A succession of lenses and baffling rings ultimately extends to the<br />
mosaic of MegaCam.<br />
The Focus Stage Assembly<br />
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