Design of NEID, an extreme precision Doppler spectrograph for WIYN

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

doi:10.1117/12.2234411

9 August 2016 Design of NEID, an extreme precision Doppler spectrograph for WIYN

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

Author Affiliations +

Proceedings Volume 9908, Ground-based and Airborne Instrumentation for Astronomy VI; 99087H (2016) https://doi.org/10.1117/12.2234411
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

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, and 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); https://doi.org/10.1117/12.2234411

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