External upgrades to improve the RV precision of the APOGEE Spectrographs

John C. Wilson; Jimmy W. Davidson Jr.; Chad Bender; Peter Dow; Matt Nelson; Liam Walters; Del Irving; Emily Farr; Sarah Tuttle; David Nidever; Nathan DeLee; Jon Holtzman; Steve Majewski; John Fox; Donald Harkins; Louis Green; Jamey Ericksen; Ryan Wagner; Mark Derwent; Colby Jurgenson; Rick Pogge; Stefanie Wachter; Solange Ramirez; Juna Kollmeier

doi:10.1117/12.2630231

29 August 2022 External upgrades to improve the RV precision of the APOGEE Spectrographs

John C. Wilson, Jimmy W. Davidson Jr., Chad Bender, Peter Dow, Matt Nelson, Liam Walters, Del Irving, Emily Farr, Sarah Tuttle, David Nidever, Nathan DeLee, Jon Holtzman, Steve Majewski, John Fox, Donald Harkins, Louis Green, Jamey Ericksen, Ryan Wagner, Mark Derwent, Colby Jurgenson, Rick Pogge, Stefanie Wachter, Solange Ramirez, Juna Kollmeier

Author Affiliations +

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 121847H (2022) https://doi.org/10.1117/12.2630231
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

Several external hardware upgrades have been developed for the APOGEE Spectrographs as part of the Sloan Digital Sky Survey-V (SDSS-V) to improve their radial velocity (RV) precision from a floor of 100-200 m/sec to approx. 30 m/sec. The upgrades include: (1) Back Pressure Regulator (BPR) systems to stabilize the internal instrument LN2 tank boil-off pressure, lessening induced movement of the APOGEE optical bench; (2) Fabry-Perot Interferometer (FPI) calibration sources to improve wavelength calibration; and (3), the use of octagonal core fiber segments in the fiber train to improve radial scrambling. We discuss the fabrication, commissioning, and early performance of these upgrades.

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John C. Wilson, Jimmy W. Davidson Jr., Chad Bender, Peter Dow, Matt Nelson, Liam Walters, Del Irving, Emily Farr, Sarah Tuttle, David Nidever, Nathan DeLee, Jon Holtzman, Steve Majewski, John Fox, Donald Harkins, Louis Green, Jamey Ericksen, Ryan Wagner, Mark Derwent, Colby Jurgenson, Rick Pogge, Stefanie Wachter, Solange Ramirez, and Juna Kollmeier "External upgrades to improve the RV precision of the APOGEE Spectrographs", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 121847H (29 August 2022); https://doi.org/10.1117/12.2630231

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