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LBT LGSF: program goals and Phase A plans

LBT LGSF: program goals and Phase A plans. consensus on program goals: exploit the scientific competitive edge of LUCIFER MOS and wide field imaging need reliable, low maintenance system with low risks, minimize changes to existing telescope systems

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LBT LGSF: program goals and Phase A plans

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  1. LBT LGSF: program goals and Phase A plans • consensus on program goals: • exploit the scientific competitive edge of LUCIFER MOS and wide field imaging • need reliable, low maintenance system with low risks, minimize changes to existing telescope systems • promptly realize ground-layer system (GLAO): ~4’ FOV, factor ≥2 improvement in FWHM and • ≥3 in concentration, operability significantly above median seeing • identify upgrade path to on-axis diffraction limited performance (=SCAO) • identify upgrade path to wide-field, modest Strehl, diffraction limited operation (=MCAO) • consensus on technology: • while Na LGSF has proven to deliver diffraction limited operation for SCAO, the currently lowest risk/affordable choice for GLAO in terms of laser technology is a pulsed Rayleigh system • projection system should be independent of laser technology, be a single projector for each of the pupils, allowing both on-axis and off-axis projection schemes • wave front sensors (wfs) should not require immediate re-design of AGW units: this may require that the wfs are outside the AGW units, upgrade to MCAO may require redesign of AGW/tertiary • unknowns: • which is the best upgrade path to diffraction limited mode ? • benefit of LGSF to interferometry (given fringe tracking issues) • how fast will a low cost, low maintenance Na-laser be available commercially ? • impact of LGSF on operations & commissioning • tradeoff between PSF stability across field and FWHM, predictability of PSF

  2. deliveries of Phase A • performance estimates as a function of seeing, Cn2(h), constellation of laser stars etc. • study availability and cost of Na-laser system • decision on laser system • opto-mechanical design • (universal) launch concept • upgrade paths to SCAO and MCAO and performance estimates, including tomography • impact on telescope, staffing plan • cost and schedule estimates phase A schedule: June 2007 – December 2007 conceptual design review: January/February 2008 (review panel to include external members)

  3. team responsibilities during phase A

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