@inproceedings{2cf7d94428cd48eba4f2cb258ba1a94b,
title = "FIES fiber injection upgrade",
abstract = "We report on the upgrade of the fiber link of FIES, the high-resolution echelle spectrograph at the Nordic Optical Telescope (NOT). In order to improve the radial velocity (RV) stability of FIES, we replaced the circular fibers by octagonal and rectangular ones to utilize their superior scrambling performance. Two additional fibers for a planned polarimetry mode were added during the upgrade. The injection optics and the telescope front-end were also replaced. The first on-sky RV measurements indicate that the influence of guiding errors is greatly suppressed, and the overall RV precision of FIES has significantly improved.",
keywords = "optical fibers, radial velocity, FIES, echelle, spectrograph",
author = "Julian St{\"u}rmer and Andreas Seifahrt and Christian Schwab and Davide Gandolfi and Pilar Monta{\~n}es-Rodriguez and Lars Buchhave",
year = "2018",
month = jul,
day = "6",
doi = "10.1117/12.2313052",
language = "English",
isbn = "9781510619579",
volume = "10702",
series = "Proceedings of SPIE",
publisher = "SPIE",
pages = "1--5",
editor = "Evans, {Christopher J.} and Luc Simard and Hideki Takami",
booktitle = "Ground-based and Airborne Instrumentation for Astronomy VII",
address = "United States",
note = "Ground-based and Airborne Instrumentation for Astronomy VII 2018 ; Conference date: 10-06-2018 Through 14-06-2018",
}