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ESPaDOnS: picture gallery http://webast.ast.obs-mip.fr/magnetisme/espadons_new/gallery.html detailed view of the exposure meter with the main collimator in the background; the small pickup mirror reflecting off photons towards the exposure meter optics, as well as the exposure meter shutter, are clearly visible; detailed view of the 204mm wide and 408mm long R2 diffraction grating in its mount (inspired from the feros design); the grating is tilted downwards (with 6 invar pins glued on its rear and side surfaces to hold it against gravity) to minimise dust accumulation on the diffracting surface, and semi circular baffles are included in the bottom part of the mount to reduce straylight from the grating to a minimum; detailed view of the transfer collimator in its mount; the side panel of the main collimator and part of the mirror itself is also visible on the left of the image (the rest of the main collimator hiding behind the black baffle); global view of the last section of the spectrograph optics; photons reflected off the transfer collimator (not visible here) are cross-dispersed by the prism train (in its black parallelepipedic cage with two handles on top, on the right of the image) and concentrated by the large dioptric camera (black cylinder with a hook on top of it, in the middle of the image) before being collected onto the ccd detector inside its dewar and vaccuum vessel (pink cylinder on the left of the image); the thin disc between the prism train and the dioptric camera is the motorised hartmann mask, used to focus automatically the spectrograph; detailed view of the cross-dispersing prism train within its mount; the whole train can be rotated <strong>manual</strong>ly (when aligning the spectrograph) with the newport stage included in its base; detailed view of the ccd dewar with its attendant electronics installed on top of it and the permanent evacuated fill/exhaust pipe coming from behind (with further insulation added around it, forming a yellowish horizontal cylinder on the right side of the image); the dewar mount was designed so that the ccd tilts could be adjusted to fit the instrument focal plane to within better than 1 arcmin; close-up view of the pressure sensor (accurate to within 0.01mbar) installed within the spectrograph; note the temperature sensor (thin horizontal rod) mounted on the base of the transfer collimator (upper left corner of image); three such temperature sensors (accurate to within 0.01deg) are installed throughout the 4 of 5 08/07/04 11:36 PM
ESPaDOnS: picture gallery http://webast.ast.obs-mip.fr/magnetisme/espadons_new/gallery.html spectrograph enclosure; © Jean-François Donati, last update June 15 2004 5 of 5 08/07/04 11:36 PM
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