9 August 2016 Design of NEID, an extreme precision Doppler spectrograph for WIYN
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Abstract
We have developed an optical design for a high resolution spectrograph in response to NASA’s call for an extreme precision Doppler spectrometer (EPDS) for the WIYN telescope. Our instrument covers a wavelength range of 380 to 930 nm using a single detector and with a resolution of 100,000. To deliver the most stable spectrum, we avoid the use of an image slicer, in favor of a large (195 mm diameter) beam footprint on a 1x2 mosaic R4 Echelle grating. The optical design is based on a classic white pupil layout, with a single parabolic mirror that is used as the main and transfer collimator. Cross dispersion is provided by a single large PBM2Y glass prism. The refractive camera consists of only four rotationally symmetric lenses made from i-Line glasses, yet delivers very high image quality over the full spectral bandpass. We present the optical design of the main spectrograph bench and discuss the design trade-offs and expected performance.
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C. Schwab, A. Rakich, Q. Gong, S. Mahadevan, S. P. Halverson, A. Roy, R. C. Terrien, P. M. Robertson, F. R. Hearty, E. I. Levi, A. J. Monson, J. T. Wright, M. W. McElwain, C. F. Bender, C. H. Blake, J. Stürmer, Y. V. Gurevich, A. Chakraborty, L. W. Ramsey, "Design of NEID, an extreme precision Doppler spectrograph for WIYN", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99087H (9 August 2016); doi: 10.1117/12.2234411; https://doi.org/10.1117/12.2234411
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