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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 225932.0, MPI für Astronomie / Publikationen_mpia
Performance of Subaru Cassegrain Adaptive Optics System
Authors:Takami, Hideki; Takato, Naruhisa; Hayano, Yutaka; Iye, Masanori; Oya, Shin; Kamata, Yukiko; Kanzawa, Tomio; Minowa, Yosuke; Otsubo, Masashi; Nakashima, Koji; Gaessler, Wolfgang; Saint-Jacques, David
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Publications of the Astronomical Society of Japan
Volume:56
Start Page:225
End Page:234
Review Status:not specified
Audience:Not Specified
Abstract / Description:The design and performance of the Cassegrain
Adaptive Optics (AO) system for the 8.2m Subaru
Telescope are reported. The system is based on a
curvature wavefront sensor with 36
photon-counting avalanche photodiode modules and
a bimorph wavefront correcting deformable mirror
with 36 driving electrodes. The engineering
first light of the AO system took place in 2000
December. The AO system has been in service since
2002 April for two open-use instruments, an
infrared camera and spectrograph and a
coronagraph imager with adaptive optics. The
Strehl ratio in the K-band is around 0.3 for
bright guide stars under 0''.4 K-band seeing
condition. The control loop performs with 2060
corrections per second. High sensitivity of the
wavefront sensor allows significant improvement
in the image quality, even for faint guide stars
down to R = 18 mag. The FWHM of stellar images
in a globular cluster was measured to derive an
estimation of the isoplanatic angle and was found
nearly constant out to 30'' from the guide star,
indicating that the height of the effective
turbulent layer of that particular night was less
than 1.8km. The on-going upgrade plans for a
fivefold increase in the number of control
elements and for the installation of a laser
guide AO system are described.
Free Keywords:atmospheric effects; infrared: general;
; instrumentation: adaptive optics; instrumentation:
; high angular resolution; telescopes
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:Observatory of Japan, North A'Ohoku Place, Hilo,
HI96720, USA) AB(Subaru Telescope, National
Astronomical Observatory of Japan, North A'Ohoku
Place, Hilo, HI96720, USA) AC(National
Astronomical Observatory, Mitaka, Tokyo 181-8588)
AD(National Astronomical Observatory, Mitaka,
Tokyo 181-8588; Department of Astronomy, Graduate
University for Advanced Studies, Hayama, Kanagawa
240-0193) AE(Subaru Telescope, National
Astronomical Observatory of Japan, North A'Ohoku
Place, Hilo, HI96720, USA) AF(Advanced Technology
Center, National Astronomical Observatory,
Mitaka, Tokyo 181-8588) AG(Subaru Telescope,
National Astronomical Observatory of Japan, North
A'Ohoku Place, Hilo, HI96720, USA) AH(Subaru
Telescope, National Astronomical Observatory of
Japan, North A'Ohoku Place, Hilo, HI96720, USA;
Department of Astronomy, The University of Tokyo,
Bunkyo, Tokyo 113-0033) AI(Advanced Technology
Center, National Astronomical Observatory,
Mitaka, Tokyo 181-8588) AJ(Hitachi Software
Engineering Co. Ltd., Higashi Shinagawa 4-12-7,
Tokyo 140-0002) AK(Max-Plank Institut f‚‚uuml;r
Astronomie, K‚‚ouml;nigstuhl 17, 69117
Heidelberg, Germany) AL(Department de physique,
Universit‚‚eacute; de Montr‚‚eacute;al,
Montr‚‚eacute;al Qu‚‚eacute;bec, H3C 3J7, Canada)
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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