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Announcement to Michelle Users

Jean-Rene Roy, Associate Director Gemini North

29 May 2003

End of First Michelle Engineering Run on Gemini

13 Mar 2003

Michelle is on Gemini and will have one final night of alignment tests on March 17, prior to being removed from the telescope for about three months. During that period it is expected that the dead array channel will be revived and the internal optical alignment will be adjusted/improved. In addition, there will be work done at the telescope to increase the cooling efficiency and thereby reduce the detector temperature.

Last update March 13, 2003; R. S. Fisher & T. R. Geballe


Jason, please turn this into just a heading/divider, like you're going to do with the "NORTH" link

Hurricaine Flossie Update

With the possibility of  dangerous conditions associated with the Pacific hurricane Flossie, the Gemini Observatory offices in Hilo, Hawaii and the facilities on Mauna Kea will be closed on Monday night and Tuesday (day and night).

For more information on the current status of the storm see the Central Pacific Hurricane Center:

Updates will be provided here as circumstances require and allow.

NIR Detector

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The NIRI near-IR science detector is a 1024x1024 Aladdin InSb array with 27 micron pixels and sensitive from ~1 to 5 microns made by Raytheon/Santa Barbara Research Center. The camera lenses focus the telescope beam onto the detector with precise focussing being achieved by a translational focus stage upon which the array is mounted. The photo below shows the Aladdin array mounted on this focus stage.

f/14 Optics

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f/6 Optics

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The f/6 camera optics provides NIRI with a wide-field imaging mode at a pixel scale of 0.116"/pixel and a fov of ~2'. The f/6 camera lens is a multi-component (4) lens of diameter ~80mm made of BaF2, ZnSe, LiF and ZnS. All but two surfaces are spherical with one ZnSe and ZnS surface being aspheric. The top of the wide-field f/6 lens can be

f/32 Optics

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Pupil Viewer Optics

NIRI Optical Overview - Pupil Viewer Optics

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