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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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Beam Steerer

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Pupil Mask/Filter Wheel

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The pupil mask/filter wheel is of a similar design as the two filter wheels, is 530mm in diameter and contains apertures for up to 12 masks and filters. The nominal pupil image has a diameter of 36mm. In fact, this is where the 5 NIRI grisms (transmission grating prisms) are located to facilitate observations in its spectroscopic mode.