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Status of LAMOST

Status of LAMOST. ZHAO Yongheng National Astronomical Observatories of China. Structure of LAMOST. MA mirror. Fiber Positioning. Fibers. MB mirror. Spectrographs CCDs. Ma: reflecting corrector (24 sub-mirrors) ~ 4.9m Mb: spherical mirror (37 sub-mirrors) ~ 6.1m.

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Status of LAMOST

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  1. Status of LAMOST ZHAO Yongheng National Astronomical Observatories of China

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

  3. Ma: reflecting corrector (24 sub-mirrors) ~ 4.9m • Mb: spherical mirror (37 sub-mirrors) ~ 6.1m

  4. Basic parameters of LAMOST • 4.9m/6.1m 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. 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

  6. Technical Challenges Active optics Both thin mirror and segmented mirror active optics in MA segmented mirror active optics in MB Fiber positioning 4000 fibers at LAMOST SDSS: 640 fibers 2dF: 400 fibers

  7. LAMOST small system • June 2007 • 6Ma and9 Mb submirror  ~ 2m LAMOST • Small focus plane + 250 fibers • 1 spectrograph

  8. Active optics & supporting

  9. Results of Close Loop Active Optics 第九号星闭环跟踪结果（2007.6.8 180组）

  10. LAMOST- Positioning for 4000 fibers Focal Plate for holding 4000 fibers Prototype For 19 fibers In USTC Double arm scheme

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

  12. VPHG (Volume Phase Holographic Grating)

  13. E2V-CCD203

  14. Image quality (R=1000) blue red

  15. Resolution of the spectrum

  16. 南京 红区 蓝区 兴隆

  17. 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!

  18. Sky Skylight in day 5月25日15时

  19. 6月5日18时 Skylight spectra

  20. Select the targets

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

  22. 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)

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

  24. Current States

  25. MB

  26. 37sub-mirrors of MB （July 13,2008)

  27. 24 sub-mirrors of MA

  28. Preliminary test on pointing error of telescope

  29. 24 sub-mirrors of MA（Sept. 10, 2008)

  30. Oct. 11, 2008image quality

  31. Oct. 11, 2008

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

  33. At 5.2 degrees FOV

  34. 4000 optical fibers

  35. spectrographs

  36. Test spectra（8月25日 3号光谱仪） Blue Red

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