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Prime Focus Imaging Spectrograph Status

Prime Focus Imaging Spectrograph Status. 8 of 9 collimator and 6 of 9 camera lenses received (including all CaF 2 lenses) Slitmask mechanism assembled and wired, waveplate mechanism assembled Structure in fabrication at Rutgers Waveplates shipping; beamsplitter due next month

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Prime Focus Imaging Spectrograph Status

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  1. Prime Focus Imaging SpectrographStatus • 8 of 9 collimator and 6 of 9 camera lenses received (including all CaF2 lenses) • Slitmask mechanism assembled and wired, waveplate mechanism assembled • Structure in fabrication at Rutgers • Waveplates shipping; beamsplitter due next month • Mass under control: margin improved 11.8  15.3 kg • Control system wiring, S/W in progress • With >96% awarded, use of budget reserve is 77% • Concerns: schedule SSWG

  2. "Pickup" element: awaits asphere Asphere delayed on month Still in fab; awaiting new delivery date Vendor broke 2 NaCl blanks; new ones just received Optics • Collimator- looks like it will be ready in time for the structure (Jan) • Camera- Unless coating goes faster than vendor schedule (12 wks), will becomes critical path and could delay delivery. Need by Mar • Detector- Want 1 month before camera SSWG

  3. Collimator Fused Quartz Fused Quartz Fused Quartz CaF2 CaF2 CaF2 (NaCl) SSWG Fused Silica CaF2

  4. CaF2 Camera CaF2 Fused Silica CaF2 (Fused Silica asphere) Fused Silica (Fused Silica “pickup”) NaCl (Fused Silica field flattener) SSWG

  5. The Prime Focus Imaging Spectrograph Grating Server Collimator Optics Camera Detector Dewar Slit Mask Server Waveplate Mechanism Filter Server Articulation Rail Open Truss Structure SSWG Fabry-Perot Etalons

  6. Structure & Mechanisms Slitmask Mechanism Structure Base Jig Waveplate Mechanism SSWG

  7. Procurement Status SSWG

  8. Procurement Status - II SSWG

  9. Budget: Cost-to-Completion • With >96% of major purchased equipment awarded, have used 77% of budgeted reserve • Remaining $169K available for mishaps and schedule problems • Would pay for ~ 5 mo schedule stretch at highest salary burn rate SSWG

  10. Budget: Prognosis • Positive deltas • spare CaF2 blanks: $32,800. Will probably be recovered. • SAAO labor ForEx losses $41K (how is this accounted?) • NaCl and Fused Silica spares $8K • design subcontractor ~$30K • machining underestimates ~$20K • Negative Deltas • conservative PDR mechanism costs ~$9K • Lens Fabrication savings ~25K SSWG

  11. Concern: Schedule • Optics delivery critical path • Mechanism “waterfall” easily disrupted • testing delayed until enough of control system is wired • Testing phase: graduate student, postdoc (UW contribution) • Detector delivery has only 4 weeks slack • Etalon delivery has 2 months slack • Ship 23 Aug, 2004 • Arrive Sutherland 1 Oct, 2004 • Uncertain commissioning schedule SSWG

  12. Mechanical Schedule SSWG

  13. Optics Schedule SSWG

  14. Control System SSWG

  15. Testing and Commissioning Schedule SSWG

  16. Some Questions • Filter complement • Etalon interference filters currently planned for imaging only (85 mm dia), not spectroscopy (125 x 85). Some suggestion for subset of larger ones for multislit applications (eg 510 nm region). Others? • No plan for interference filters for imaging below 430 nm (etalon limit). Problem? • How will we commission if SALT does not have full mirror complement? What is absolute minimum for turnover? SSWG

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