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NICI Fiber Optic Calibration Source

The NICI Fiber Optic Calibration Source (FOCS) is a four-position translator mounted at the beam entrance focus of the AO relay. It provides an internal reference source for AO calibration and mapping the distortion and registration of the two science detectors. The fibers in all positions are of the single-mode type. The lamp that illuminates the fiber supports variable illumination and is controlled through the instrument sequencer.

NICI Fiber Optic Calibration Source
Position	Description	Gemini ID
1	One fiber in the field center for system tests and AO calibration. Also acts as dust cover to AO relay.	--
2	40 x 40 grid of 130 µm pinholes for distortion and registration mapping.	G...
3	Two fibers in opposite corners of the field. Can be inserted while taking a science image to track the registration of the two arrays.	--
4	Open.	--

Created 20 July 2005, T. Hayward