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Proceedings Paper

Tracking faint fringes with the CHARA-Michigan Phasetracker (CHAMP)
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Paper Abstract

The CHARA-Michigan Phasetracker (CHAMP) successfully tracks fringes in 4-telescope and 6-telescope modes when observing high-visibility targets. We have found that our primary targets (Young Stellar Objects) have unexpectedly low visibility fringes (<20%) for most baselines at CHARA, generally below our tracking thresholds. We have undertaken an upgrade cycle in 2011-2012 to re-optimize CHAMP to allow group-delay tracking on the faintest fringes possible. We describe our multi-pronged strategy using special dicroics, new piezo scanners, and our first attempts to explore CHARA J-band made possible by using special metrology-blocking laser filters. CHAMP can now be used with all the combiners at CHARA.

Paper Details

Date Published: 12 September 2012
PDF: 9 pages
Proc. SPIE 8445, Optical and Infrared Interferometry III, 84451I (12 September 2012); doi: 10.1117/12.926399
Show Author Affiliations
John D. Monnier, Univ. of Michigan (United States)
F. Baron, Univ. of Michigan (United States)
M. Anderson, Univ. of Michigan (United States)
S. Kraus, Univ. of Michigan (United States)
R. Millan-Gabet, IPAC, California Institute of Technology (United States)
E. Pedretti, Scottish Association for Marine Science (United Kingdom)
X. Che, Univ. of Michigan (United States)
T. ten Brummelaar, CHARA Array, Georgia State Univ. (United States)
N. Calvet, Univ. of Michigan (United States)

Published in SPIE Proceedings Vol. 8445:
Optical and Infrared Interferometry III
Françoise Delplancke; Jayadev K. Rajagopal; Fabien Malbet, Editor(s)

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