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Nulling at the Keck InterferometerThe 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 both cancel the on-axis starlight and to 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.
Document ID
20070017411
Acquisition Source
Jet Propulsion Laboratory
Document Type
Preprint (Draft being sent to journal)
External Source(s)
Authors
Colavita, M. Mark
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Serabyn, Gene
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Wizinowich, Peter L.
(Keck Observatory Mauna Kea, HI, United States)
Akeson, Rachel L.
(California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 23, 2013
Publication Date
May 24, 2006
Subject Category
Instrumentation And Photography
Meeting Information
Meeting: SPIE Conference on Astronomical Telescopes and Instrumentation
Location: Orlando, FL
Country: United States
Start Date: May 24, 2006
End Date: May 31, 2006
Distribution Limits
Public
Copyright
Other
Keywords
interferometry
Keck telescopes
Keck Interferometer
nulling

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