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Proceedings Paper

CHARA Michigan phase-tracker (CHAMP): design and fabrication
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Paper Abstract

We present the design for a near-infrared (JHK) fringe tracker to be used at the CHARA Array, a long baseline optical interferometer located at Mount Wilson Observatory. The CHARA Michigan Phase-tracker (CHAMP) is being fabricated and tested at the University of Michigan and will be transported to the CHARA Array for general use. CHAMP is separate from the science combiners and can therefore be optimized for fringe tracking. It will modulate around fringe center by 1-2λ at up to 500 Hz and calculate phase offsets in real-time using a modified 'ABCD' method . Six pair-wise Mach-Zehnder combiners will phase the entire Array. We give an overview of the optical layout and discuss our design strategy. Components such as the path-length modulators, low-OH fiber transport system, 1024x1024 HAWAII-1 detector, and control computer are discussed.

Paper Details

Date Published: 28 June 2006
PDF: 9 pages
Proc. SPIE 6268, Advances in Stellar Interferometry, 62683K (28 June 2006); doi: 10.1117/12.672168
Show Author Affiliations
David H. Berger, Univ. of Michigan (United States)
John D. Monnier, Univ. of Michigan (United States)
Rafael Millan-Gabet, Michelson Science Ctr., California Institute of Technology (United States)
Theo A. ten Brummelaar, The CHARA Array, Mount Wilson Observatory (United States)
Philip Muirhead, Cornell Univ. (United States)
Ettore Pedretti, Univ. of Michigan (United States)
Nathalie Thureau, Univ. of Michigan (United States)

Published in SPIE Proceedings Vol. 6268:
Advances in Stellar Interferometry
John D. Monnier; Markus Schöller; William C. Danchi, Editor(s)

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