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Proceedings Paper

Nulling at the Keck interferometer
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Paper Abstract

The nulling mode of the Keck Interferometer is being commissioned at the Mauna Kea summit. The nuller combines the two Keck telescope apertures in a split-pupil mode to cancel the on-axis starlight and coherently detect the residual signal. The nuller, working at 10 um, is tightly integrated with the other interferometer subsystems including the fringe and angle trackers, the delay lines and laser metrology, and the real-time control system. Since first 10 um light in August 2004, the system integration is proceeding with increasing functionality and performance, leading to demonstration of a 100:1 on-sky null in 2005. That level of performance has now been extended to observations with longer coherent integration times. An overview of the overall system is presented, with emphasis on the observing sequence, phasing system, and differences with respect to the V2 system, along with a presentation of some recent engineering data.

Paper Details

Date Published: 23 June 2006
PDF: 10 pages
Proc. SPIE 6268, Advances in Stellar Interferometry, 626803 (23 June 2006); doi: 10.1117/12.672651
Show Author Affiliations
M. Mark Colavita, Jet Propulsion Lab. (United States)
Gene Serabyn, Jet Propulsion Lab. (United States)
Peter L. Wizinowich, W.M. Keck Observatory (United States)
Rachel L. Akeson, Mitchelson Science Ctr., California Institute of Technology (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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