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Status of LAMOST

Status of LAMOST. The Large Sky Area Multi-Object Fiber Spectroscopic Telescope. Structure of LAMOST. MA mirror. Fiber Positioning. Fibers. MB mirror. Spectrographs CCDs. Optical System. Basic parameters of LAMOST. 4.5m/6.3m Schmidt telescope

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Status of LAMOST

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  1. Status of LAMOST The Large Sky Area Multi-Object Fiber Spectroscopic Telescope

  2. Structure of LAMOST MA mirror Fiber Positioning Fibers MB mirror Spectrographs CCDs

  3. Optical System

  4. Basic parameters of LAMOST • 4.5m/6.3m Schmidt telescope • The declination of observable sky area ranges from -10 to +90. • 20 square degree of the FOV • 4000 fibers • Spectrum resolution: VPH (Volume Phase Holographic) Grating R=1000, 2000, 5000, 10000

  5. General Situation of the Project • The LAMOST project has its management under National Astronomical Observatories (hereafter NAOC) with its project office in the headquarter of NAOC, and its main workforce distributed in the Nanjing Institute of Astronomical Optics and Technology /NAOC in Nanjing, the Beijing part of NAOC and in the University of Science and Technology of China in Hefei. The project has its board and scientific and technical committee as usual.

  6. Xinglong Station, NAOC the site Beijing: NAOC Project HQ Instruments & Software Science Nanjing: NIAOT (NAOC) Telescope Instruments Hefei: USTC Science

  7. Schedules of LAMOST Project • ReviewedApproved • Proposal Nov. 1996 Apr. 1997 • Feasibility Study Jul. 1997 Aug. 1997 • Preliminary Design Apr.-May 1999 Jun. 1999 • Detailed Design Sep. 2001 • Construction 2001-2008 • First Light 2008.10

  8. MA: 5.72mx4.4m reflecting corrector (24 sub-mirrors) • MB: 6.67mx6.05m spherical mirror (37 sub-mirrors)

  9. Technical Challenges of Active Optics • A combination of segmented mirror active optics and thin deformable mirror active optics on one mirror • Two large segmented mirrors needed to be actively controlled in the same time in the telescope. • With hexagonal deformable sub-mirrors. • Wave front sensing on a variable aperture

  10. Active optics & supporting

  11. MB

  12. 37sub-mirrors of MB （July 13,2008)

  13. 24 sub-mirrors of MA

  14. 24 sub-mirrors of MA（Sept. 10, 2008)

  15. Oct. 8, 2008 Mean=1.14″, Maintenance Mean=1.00″ 80%=1.21″, 80% Maintenance=1.14″

  16. At 5.2 degrees FOV

  17. multi-optical fiber positioning

  18. Fiber positioning unit

  19. 4000 fiber position units

  20. 16 Spectrographs

  21. LAMOST-LRS Optical System Blue (370~590nm) R5000/10000 R1000/2000 Red (570~900nm) R5000/10000 R1000/2000

  22. Resolution powers

  23. Spectrographs

  24. VPHG (Volume Phase Holographic Grating)

  25. E2V-CCD203

  26. 南京 红区 蓝区 兴隆

  27. Resolution of the spectrum

  28. Operation software Input Catalog SSS OCS TCS ICS DHS Spectr. Database LAMOST

  29. SSS OCS DPS Software forautomatic observation & data processing catalogue processing observation

  30. First light of the small system • On May 20 2007 The LAMOST small system (about 2m in diameter and have 250 firbers) got its first spectrum!

  31. Sky 白天天光观测 5月25日15时

  32. 6月5日18时 天光光谱

  33. Select the targets

  34. Field No. 9 • June 22, 02h • 203 targets • 3600 • 123 Spectrum

  35. Component & Total Efficiency 1.00 0.80 telescope Efficieny fiber 0.60 Spectrograph 0.40 CCD 0.20 total 0.00 370 450 550 650 750 850 Wavelength(A)

  36. Efficincy • R波段 • Observe data ( Sky)：12.0% • Theoretical value： 16.5% 中值为1

  37. July 2008 • MB: all 37 sub-mirrors • MA: all 24 sub-mirrors • Co-focus for MB: <0.4” • To test active optics • Spectrographs: 16 • Fiber positioning units: 4000 • Wireless control system has tested

  38. August 24：4000optical fibers completed • August 30：16 spectrographs completed  LAMOST completed all hardware

  39. Test spectra(Aug.5, No.3号spectrograph） Blue Red

  40. Relative efficiency（No.6 spectrograph-blue）

  41. Efficiency of spectrograph 370~900nm • Target ：35%（peak） • According to test on reach parts: 50% • According to test on whole spectrograph: 43%

  42. Sept. 28 • More than 2000 spectra got in one test observation • Oct. 13 • About 3000 spectra got in one test observation

  43. Spectra of stars（28/9/2008） Red Blue

  44. Plan • 2009: Technical commission period • 2010: Scientific commission period • 2011: start regular spectroscopic survey

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