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CHARA Michigan phase-tracker (CHAMP): a preliminary performance report

Berger, David H. and Monnier, John D. and Millan-Gabet, Rafael and ten Brummelaar, Theo A. and Anderson, Matthew and Blum, Jennifer L. and Blasius, Timothy and Pedretti, Ettore and Thureau, Nathalie (2008) CHARA Michigan phase-tracker (CHAMP): a preliminary performance report. In: Optical and Infrared Interferometry. Proceedings of SPIE. No.7013. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 701319. ISBN 9780819472236.

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The CHARA Michigan Phase-tracker (CHAMP) is a real-time fringe tracker for the CHARA Array, a six-telescope long baseline optical interferometer on Mount Wilson, California. CHAMP has been optimized for tracking sensitivity at J, H, or K bands and is not meant as a science instrument itself. This ultimately results in maximum sensitivity for all the science beam combiners that benefit from stabilized fringes. CHAMP was designed, built, and tested in the laboratory at the University of Michigan and will be delivered to the CHARA Array in 2008. We present the final design of CHAMP, highlighting some its key characteristics, including a novel post-combination transport and imaging system. We also discuss testing and validation studies and present first closed-loop operation in the laboratory.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Monnier, John D.0000-0002-3380-3307
Millan-Gabet, Rafael0000-0003-0447-5866
ten Brummelaar, Theo A.0000-0002-0114-7915
Additional Information:© 2008 Society of Photo-Optical Instrumentation Engineers (SPIE). The fringe tracker funding, including financial support for DHB, was provided by the National Science Foundation through grant AST–0352723. We would like to thank Anna Moore and Michael Ireland for their initial design of the lens triplet. We would also like to thank Michael Ireland for consulting on many other aspects of CHAMP, especially the inspiration for the image slicer design. We acknowledge Scott Webster at the University of Michigan who single-handedly machined every custom part of CHAMP (all 126 parts and counting).
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:long baseline optical interferometry; fringe tracking; near infrared; instrumentation
Series Name:Proceedings of SPIE
Issue or Number:7013
Record Number:CaltechAUTHORS:20180530-104600699
Persistent URL:
Official Citation:David H. Berger, John D. Monnier, Rafael Millan-Gabet, Theo A. ten Brummelaar, Matthew Anderson, Jennifer L. Blum, Timothy Blasius, Ettore Pedretti, Nathalie Thureau, "CHARA Michigan phase-tracker (CHAMP): a preliminary performance report", Proc. SPIE 7013, Optical and Infrared Interferometry, 701319 (28 July 2008); doi: 10.1117/12.790168;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86708
Deposited By: George Porter
Deposited On:30 May 2018 23:13
Last Modified:15 Nov 2021 20:41

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