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FIRE Spectrograph Preliminary Commissioning: Status Update Plan

This document outlines the status update and preliminary commissioning plan for the FIRE spectrograph project, including capabilities, optical layout, observational impact, calibration processes, design reviews, and current design statuses of optics, detectors, mechanics, and software products.

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FIRE Spectrograph Preliminary Commissioning: Status Update Plan

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  1. FIRE:Status update and Preliminary Commissioning Plan Rob Simcoe (A. Burgasser, M. Smith, R. Bernstein, B. Bigelow, J. Pipher, C. McMurtry, W. Forrest) May 20, 2007

  2. Best Estimate of delivery: 2009A • Remainder 2007: Detailed design and development • 2008: Fab and assembly • Late 08/Early 09: Aligment / testing • Early 2009: Pre-ship review • 2009: Shipment and commissioning

  3. Capabilities: Echelle • Single object • R=6000 (50 km/s) for 0.6” slit • 0.85-2.5 microns single-shot • Orders 10-30 • Pixel scale (spatial direction) • Reddest order: 0.18” • Bluest order: ~0.10” • 0.18” everywhere in dispersion • Slits down to 0.3” • Slit length 7-8”

  4. Optical Layout

  5. Capabilities: Low-dispersion • Via x-dispersion prisms (ZnSe, Infrasil) • R ~ 1000 • Not constant, not linear • Wavelength coverage same • Slit length ~1’ • High throughput

  6. Capabilities: Slit-viewing • Cold, IR slit viewer • Primary function: acquisition • Secondary function: flexure compensation “slow guiding” • 50” x 50” FOV, 0.1” pixels • Probably fixed-filter (J, H, or K)

  7. Observatory impact • Folded port operation • Cooled with CCR • Hose plumbing early • Less maintenance later • 2 mechanisms (slit, 2-position turret) • Observatory guiders, cable wraps, some TCS interfacing

  8. Spectral Footprint • Orders 11-30 • Matched to H2RG detector • Note sky lines • Only FSR shown

  9. Theoretical throughput • Includes telescope, slit loss • Representative BBAR coatings for materials, AOIs • Detector: • Conservative QE • Realistic dark • RN an issue

  10. Calibration • FIRE-specific unit external to dewar • Produce f/11 beam • Produce pupil for internal alignment • Ancillary calibration (arc, flats) • Primary wv cal from sky • Primary FF cal from observatory screens

  11. 1st design review • Dec 2006 • Verified optical design • Verified plans for detector • Recommended more focus on mechanics • Budget concerns as presented • Response to date • Hired mechanical engineer from MKI • Secured additional internal funding (Primary funding from MRI)

  12. Design Status: Optics • Layout essentially complete • Vetted by reviewers, Epps, (Shec?) • Rebecca now tolerancing design • End of summer • Order long-lead blanks (i.e. ZnSe prisms) • Contract external optics • Slit-viewer in Rev A • All-refracting, basic layout known • Re-tuning for off-the-shelf optics • Coating test bench (Summer 2007)

  13. Design Status: Detectors • All eyes on Teledyne (Rockwell) • Order at lawyer stage • Development at UR • SIDECAR testing (with existing MUX) • Eng grade for slit-viewer • ~ year for SG device • Communicate with FourStar

  14. Approximate instrument envelope • Early rev, will grow slightly larger • Slight modification of standard serpentine cable wrap

  15. Design Status: Mechanics • Building from inside out • IC at optical bench • Prism enclosure • Detector mount • Grating cell • Turret • Contract • Camera • Offner

  16. Design Status: Mechanics • Bench flexure analysis ongoing • Pointing (shear) and focus (axial) displacements near spec • Aiming for <=0.1 pixel deflections per hour

  17. Software products: UI • Modeled on (stolen from) FourStar • Separate controls for spectrograph, slit-viewer • Some user-level TCS control • Quick-look extraction • Minimal control options

  18. Software products: planning and reduction • SNR / Format simulator (exists) • IDL reduction tools provided by team • Kelson-style sky subtraction • Experience, incentive on instrument team (MIKE, GNIRS) • 3-6 months after 1st light

  19. Port preference • Your problem, not mine • Preference • Long run? Probably on telescope without FourStar • Short run? • FourStar? • F5? • Commissioning collisions

  20. Commissioning Needs • Re-assembly in LCO instrument lab (class 10k) • 3-phase power needed • Not much room required • Routing of CCR lines • Computing infrastructure • UPS issues

  21. Commissioning Tasks • Reassemble, tweak alignment • Full lab cooldown • Transport to summit, mount • Calibrate pointing, slit-viewer • Pupil alignment wrt telescope • Computing / TCS

  22. Best Estimate of delivery: 2009A • Remainder 2007: Detailed design and development • 2008: Fab and assembly • Late 08/Early 09: Aligment / testing • Early 2009: Pre-ship review • 2009: Shipment and commissioning

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