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Active Control of Aberrations for the Large Synoptic Survey Telescope (LSST)

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

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Active Control of Aberrations for the Large Synoptic Survey Telescope (LSST)

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  1. 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

  2. Outline • LSST • Basic Design • Curvature Sensors • Results • Conclusion

  3. 3 Mirrors • 10 square-degree field • 3.2 Gigapixel camera • Google Universe? • Chile

  4. Basic Design M1 8.4m M2 3.4m M3 5.0m Camera Focal Plane CWFS

  5. Bay 24 Bay 04 Bay 19 Bay 19 Bay 14 Bay 09 Bay 18 Bay 23 Bay 18 Bay 03 Bay 13 Bay 08 Bay 07 Bay 12 Bay 02 Bay 17 Bay 22 Bay 17 Bay 01 Bay 06 Bay 16 Bay 16 Bay 11 Bay 21 Bay 10 Bay 15 Bay 20 Bay 15 Bay 05 Bay 00 Camera: Focal Plane Array Focal Plane CWFS d d d 42 mm 42 mm

  6. Active Control of Aberrations • Mirror aberrations • Gravity and thermal changes • Curvature sensor errors • Sky-brightness • Phase reconstruction

  7. Effect of Sky-Brightness

  8. Stellar Magnitude 19 18 17 16 15 14 Applied Phase Reconstructed phase diagram from CCD Intra focus CCD Image Extra focus CCD Image

  9. RMS CWFS error vs. Stellar Mag.

  10. Probability

  11. All bands at 90

  12. 90 vs. 30

  13. Conclusion • Sky-brightness will introduce error • Simulated LSST CWFS accuracy meets requirements • Promising performance capabilities • Future Design improvements • Implementation in a LSST model

  14. Acknowledgements Kevin Baker Don Phillion Scot Olivier CfAO Stacie Hvisc "Funding provided through the Center for Adaptive Optics, a NationalScience Foundation Science and Technology Center (STC), AST-987683."

  15. References • Krisciunas, Kevin, and Bradley E. Schaefer. "A Model of the Brightness of Moonlight." Astronomical Society of the Pacific 103(1991): 1033-1039. • LSST, "LSST: A New Telescope Concept." Large Synoptic Survey Telescope. January 2007. LSST Corporation. 11 Jul 2007 <http://www.lsst.org/About/Tour/concept.shtml>. • Phillion, Donald, Scot S. Olivier, Kevin Baker, Lynn Seppala,and Stacie Hvisc. "Tomographic wavefront correction for the LSST." Advances in Adaptive Optics II,. 6272(2006): 1-12.

  16. Questions??

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