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The LBT AO System and LUCIFER

The LBT AO System and LUCIFER. Requirements for the commissioning of LUCIFER: performance of the AO system? Open Item: NIR TT or only ‚slow‘ flexure sensor, which detector? Open Item: Dichroic entrance window, which cut-off/-on wavelength?. Commissioning of LUCIFER.

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The LBT AO System and LUCIFER

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  1. The LBT AO System and LUCIFER • Requirements for the commissioning of LUCIFER: performance of the AO system? • Open Item: NIR TT or only ‚slow‘ flexure sensor, which detector? • Open Item: Dichroic entrance window, which cut-off/-on wavelength? LBT AO Progress Meeting, Arcetri Walter Seifert (ZAH, LSW)

  2. Commissioning of LUCIFER • Commissioning of LUCIFER seeing-limited modes: we need a stable configuration (over about 15-30min) of the secondary mirror, with image quality better than seeing +20%. Maybe fast field-stabilization, AGW more or less fully operational. • Commissioning of LUCIFER diffraction-limited modes: the AO system has to be basically operational and should deliver (high) constant Strehl over about 5-15min at least. LBT AO Progress Meeting, Arcetri Walter Seifert (ZAH, LSW)

  3. LUCIFER Performance J Band Isoplanatic Field LBT AO Progress Meeting, Arcetri Walter Seifert (ZAH, LSW)

  4. NIR TT, the original idea LBT AO Progress Meeting, Arcetri Walter Seifert (ZAH, LSW)

  5. Requirements for the NIR TT Unit • Wavelength Range: J H K • Pixelscale: 0.04arcsec/pixel (2 pixel for J) • FOV: 10x10arcsec, total FOV: 1arcmin radius • Leave ‚science‘ field unvignetted • Has to be implemented into the instrument itself • To be used with the LGS LBT AO Progress Meeting, Arcetri Walter Seifert (ZAH, LSW)

  6. Sensitivity Requirement LBT AO Progress Meeting, Arcetri Walter Seifert (ZAH, LSW)

  7. Simulation Results, PICNIC • Standard deviation of the centroiding better than 0.5 pixels, i.e. 0.02 arcsec • Detector with 20 electrons RON (i.e. PICNIC) • Sky background 3.6*10^5 e/s/arcsec^2 (combined JHKs) • Av 3mag LBT AO Progress Meeting, Arcetri Walter Seifert (ZAH, LSW)

  8. Simulation Results, HAWAII I • Standard deviation of the centroiding better than 0.5 pixels, i.e. 0.02 arcsec • Detector with 5 electrons RON (i.e. HAWAII I) • Sky background 3.6*10^5 e/s/arcsec^2 (combined JHKs) • Av 3mag LBT AO Progress Meeting, Arcetri Walter Seifert (ZAH, LSW)

  9. Slow Differential Flexure Sensor • Wavelength Range: ‚z‘, preferably also J H K • Pixelscale: 0.04arcsec/pixel (2 pixel for J) • FOV: 10x10arcsec, total FOV: 1arcmin radius • Leave ‚science‘ field unvignetted • Has to be implemented into the instrument itself • Long integration times! • -> red sensitive CCD or PICNIC LBT AO Progress Meeting, Arcetri Walter Seifert (ZAH, LSW)

  10. Layout and Implementation ADC SlitViewer NIR TT Entrance Window Telescope LBT AO Progress Meeting, Arcetri Walter Seifert (ZAH, LSW)

  11. Detector Output to AO SW Module • NIR TT or slow flexure sensor: • LUCIFER provides mechanics and optics • Detector control and read-out from AO SW • Who selects the AO guide star? Observer... • ... LBT AO Progress Meeting, Arcetri Walter Seifert (ZAH, LSW)

  12. Dichroic Entrance Window WFS LUCIFER zJHK 870nm 2500nm LBT AO Progress Meeting, Arcetri Walter Seifert (ZAH, LSW)

  13. Optimum Cut-On/Off Wavelength? 870nm 970nm LBT AO Progress Meeting, Arcetri Walter Seifert (ZAH, LSW)

  14. FOV of the TT Unit Entrance Window Science Field NIR TT Field LBT AO Progress Meeting, Arcetri Walter Seifert (ZAH, LSW)

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