2. DESCRIPTION OF THE SPECTROGRAPH, STEP BY STEP 2.1 The ISB and optical component situated before the fore-optics The fore-optics of the present instrument will be installed on a side of the optical Instrument
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چکیده
The fore-optics of the present instrument will be installed on a side of the optical Instrument Selector Box. Inside the ISB, a moveable pick-off mirror deviates the light towards the foreoptics, at 90 from the beam coming from M3. When the mirror is off, the light enters the High Throughput Spectrograph, in construction at UNC. An ADC (Atmospheric Dispersion Corrector) and a Calibration Lamps System are shared between the two spectrographs. A mirror in form of a ring around the pick-off mirror will be used by the tip-tilt sensor. The ISB is being designed at CTIO, and we do not describe this system here.
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