Active Control of Aberrations for the Large Synoptic Survey Telescope (LSST)
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Active Control of Active Control of Aberrations for the Aberrations for the Large Synoptic Survey Large Synoptic Survey Telescope (LSST) Telescope (LSST) Brice Cannon Brice Cannon Lawrence Livermore National Laboratory Lawrence Livermore National Laboratory Research Research Supervisor Supervisor : Scot Olivier : Scot Olivier Research Mentor: Stacie Hvisc Research Mentor: Stacie Hvisc Home Institution: Norfolk State University Home Institution: Norfolk State University
description
Active Control of Aberrations for the Large Synoptic Survey Telescope (LSST). Brice Cannon Lawrence Livermore National Laboratory Research Supervisor: Scot Olivier Research Mentor: Stacie Hvisc Home Institution: Norfolk State University. Outline. LSST Basic Design Curvature Sensors - PowerPoint PPT Presentation
Transcript of Active Control of Aberrations for the Large Synoptic Survey Telescope (LSST)
Active Control of Aberrations Active Control of Aberrations for the Large Synoptic Survey for the Large Synoptic Survey
Telescope (LSST)Telescope (LSST)Brice CannonBrice Cannon
Lawrence Livermore National LaboratoryLawrence Livermore National LaboratoryResearch Research SupervisorSupervisor: Scot Olivier : Scot Olivier
Research Mentor: Stacie HviscResearch Mentor: Stacie HviscHome Institution: Norfolk State UniversityHome Institution: Norfolk State University
OutlineOutline
LSSTLSST Basic DesignBasic Design Curvature SensorsCurvature Sensors ResultsResults ConclusionConclusion
3 Mirrors 3 Mirrors 10 square-degree field10 square-degree field 3.2 Gigapixel camera3.2 Gigapixel camera Google Universe?Google Universe? ChileChile
Basic DesignBasic Design
M1 8.4mM1 8.4mM2 3.4mM2 3.4mM3 5.0mM3 5.0m
CameraCameraFocal PlaneFocal PlaneCWFSCWFS
Camera: Focal Plane ArrayCamera: Focal Plane Array
d
Bay 17 Bay 16 Bay 15Bay 18Bay 19
Bay 22 Bay 21 Bay 20Bay 23Bay 24
Bay 12 Bay 11 Bay 10Bay 13Bay 14
Bay 17 Bay 16 Bay 15Bay 18Bay 19
Bay 07 Bay 06 Bay 05Bay 08Bay 09
Bay 02 Bay 01 Bay 00Bay 03Bay 04
42 mm42 mm
CWFSFocal Plane
d
d
Active Control of AberrationsActive Control of Aberrations
Mirror aberrationsMirror aberrationsGravity and thermal changes Gravity and thermal changes
Curvature sensor errors Curvature sensor errors Sky-brightnessSky-brightness
Phase reconstructionPhase reconstruction
Effect of Sky-BrightnessEffect of Sky-Brightness
Applied PhaseReconstructed phase diagram from CCD
Intra focus CCD Image
Extra focus CCD Image
Stellar Magnitude 19 18 17 16 15 14
RMS CWFS error vs. Stellar Mag.RMS CWFS error vs. Stellar Mag.
R U Y Band
0
50
100
150
200
250
10 12 14 16 18 20
Stellar Magnitude
RMS
CWFS
erro
r [nm
]
U
R
Y
ProbabilityProbabilityFour split detectors
90 degree Galactic Latitude
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
10 12 14 16 18 20
Magnitude at wavelength
(Pro
babi
lity o
f star
in 88
sq ar
cmin
)^8
U
R
Y
All bands at 90All bands at 90
90 degree
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0 50 100 150 200 250 300 350 400
RMS CWFS error [nm]
(Pro
babi
lity o
f star
in 88
sq ar
cmin
)^8
U
R
Y
90 vs. 3090 vs. 30
Rband 90 vs 30 degree Galactic Latitude
0.0
0.2
0.4
0.6
0.8
1.0
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0 50 100 150 200 250 300
RMS CWFS error [nm]
(Pro
babi
lity
of s
tar
in 8
8 sq
ar
cmin
)^8
R Band 90 degree
R Band 30 degree
ConclusionConclusion
Sky-brightness will introduce errorSky-brightness will introduce errorSimulated LSST CWFS accuracy meets Simulated LSST CWFS accuracy meets
requirementsrequirementsPromising performance capabilitiesPromising performance capabilitiesFuture Design improvementsFuture Design improvements Implementation in a LSST modelImplementation in a LSST model
AcknowledgementsAcknowledgements
Scot Olivier
Stacie Hvisc
Don PhillionKevin Baker
CfAO
"Funding provided through the Center for Adaptive Optics, a NationalScience Foundation Science and Technology Center (STC), AST-987683."
ReferencesReferences
Krisciunas, Kevin, and Bradley E. Schaefer. "A Model of the Brightness of Moonlight." Krisciunas, Kevin, and Bradley E. Schaefer. "A Model of the Brightness of Moonlight." Astronomical Society of the Astronomical Society of the PacificPacific 103(1991): 1033-1039. 103(1991): 1033-1039.
LSST, "LSST: A New Telescope Concept." LSST, "LSST: A New Telescope Concept." Large Synoptic Survey TelescopeLarge Synoptic Survey Telescope. January 2007. LSST Corporation. . January 2007. LSST Corporation. 11 Jul 2007 <http://www.lsst.org/About/Tour/concept.shtml>. 11 Jul 2007 <http://www.lsst.org/About/Tour/concept.shtml>.
Phillion, Donald, Scot S. Olivier, Kevin Baker, Phillion, Donald, Scot S. Olivier, Kevin Baker, Lynn Seppala,and Stacie Hvisc. "Tomographic wavefront correction and Stacie Hvisc. "Tomographic wavefront correction for the LSST." for the LSST." Advances in Adaptive Optics II,.Advances in Adaptive Optics II,. 6272(2006): 1-12. 6272(2006): 1-12.
