AO188/LGS
Status and Schedule
Yutaka Hayano
January 31, 2008
1
Contents

Subaru AO188/LGS overview

Performance evaluation

Status and Schedule
2
Upgrade from
AO36 to AO188/LGS
AO36
Focus
Cassegrain
WFS
Curvature WFS
Band
K-band
Limiting mag of GS 13~16 (NGS)
LGS
Strehl ratio（NGS)
（LGS)
Sky coverage@ K
FOV of WFS
No
0.3@K,
0.05@J
~1%
2’
LGSAO188
Nasmyth

1 – 5 mm
13 ~ 16 (NGS mode)
17 ~ 19（LGS mode）
> 4W SFG 10-11 mag
0.7@K, 0.3@J
0.56@K
> 50 %
2.7’
3
System layout
Instruments
IRCS
(HiCIAO)
(Kyoto 3DII)
4
AO188/NGS First Light
53” x 53”
October 2006
IRCS 52mas camera
5
K-band
FWHM V=9.2 guide star
6
Strehl
Ratio
K-band
V=9.2 guide star
Seeing
7
Encircled Energy
L’
M’
K
J
H
Seeing
z
8
System upgrade from
the first light configuration

Optics



Electronics




New electronics for new components.
Minor upgrade.
Cabling.
Software




New components. (AOIMR, BS, etc.)
Upgrade components. (AO Calibration source, Acquisition Unit etc.)
Re-configuration
Minor upgrade.
New software for new components.
Others

Cover, cooling system, AO/IRCS transfer mechanism.
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New/Upgrade items
on AO optical bench
AO Calibration
Light source
Off-axis Flat
Parabola mirror
High-order WFS
Image
rotator
ADC
AU1
Low-order
WFS
BS2
BS1
DM
Flat
mirror
AU2
HiCIAO I/F
F-conversion
Off-axis
Parabola
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Current status
Cleared up AO optical bench
AO calibration light source unit
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Schedule and Milestones
2006
First light
Design
2007
AOCAL
Manufacture
Assembly
AO188 assembly/Hilo Test
2008
HOWFS
AOCAL
2009
IMR
HOWFS
LOWFS
IMR
LOWFS
AOCAL/HOWFS/IMR
LOWFS
April - May
Summit Transportation
6/5
Second light (NGS)
7/19
Summit Test/Eng Obs
Risk shared open use (NGS)
Laser launch test/LGS test
Risk shared open use (LGS)
S08B
5/12
S09A
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Risk-shared open use (S08B)

Limited number of nights, proposals.




(~ 10 nights, ~ 5 proposals)
Use sidereal natural guide star.
IRCS. (imaging , spectroscopy)
Required functionality
 Acquisition Unit (AU) can acquires a sidereal guide star.
 AU can shifts the AO point. (dithering)
 Wavefront correction in feedback control.
 AOIMR can compensate the image rotation.
 System startup and shutdown.
 Individual check system for each component.
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