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The next large instrument on a Gemini telescope, GHOST, is being built by a collaboration including AAO, ANU and NRC-Herzberg. It aims to be a high efficiency fiber fed Echelle spectrograph with a wide wavelength range. I will describe the designтАЩs background, including lenslet-based image slicing that reduces slit losses while maintaining high resolution, and why despite cost constraints, the spectrograph has several modes, including a precision radial velocity mode and a two object mode. I will show simulated data from the unusual spectral format, and describe the work from here in the critical/final design phase. |
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