170 likes | 274 Views
Prime Focus Imaging Spectrograph Status. All lenses figured and coated; collimator & camera in assembly Slitmask, waveplate, shutter, grating, articulation, filter mechanisms wired and tested Structure in final machining at Rutgers CCD detector delivery from SAAO this week
E N D
Prime Focus Imaging SpectrographStatus • All lenses figured and coated; collimator & camera in assembly • Slitmask, waveplate, shutter, grating, articulation, filter mechanisms wired and tested • Structure in final machining at Rutgers • CCD detector delivery from SAAO this week • VPH gratings shipping; beamsplitter due next month • Control system electronics boxes tested • Mechanism S/W coded/ tested; PI tool in progress • With 100% major purchases received or awarded, use of budget reserve is 99% • Concerns: schedule. Arrival at Sutherland slipped to ~15 Dec SSWG
field flattener rework for dewar seal NaCl triplet in assembly Lens Optics • Collimator- problems with clean room; NaCl lens assembly. Delivery late this month (4 months late). Pacing item. • Camera- delivery late June • Detector- delivery this week (4 months late). Have 1 month for S/W integration SSWG
Camera Barrel Collimator & Camera Assembly Main Group: including solgel and NaCl Field Lens Doublet Final Doublet Collimator SSWG
100 mm superachromatic halfwave plate Slitviewer Optics Other Optics Delivered 3000 l/mm VPH Grating Not delivered (very late): Etalons; Beamsplitter SSWG
CCD Detector Field Flattener on cryostat SSWG
Structure/ Mechanisms Grating Server Collimator Optics Camera Detector Dewar Slit Mask Server Waveplate Mechanism Filter Server Articulation Rail Open Truss Structure SSWG Fabry-Perot Etalons
Structure Welded invar structure: Welding, heat treatment completed In finish machining Due end of May (4 months late) Dolly; test fixture ready Pacing item SSWG
Mechanisms Slitmask Server Waveplate Rotator SSWG
Mechanisms – II 162 mm shutter Grating Server Mechanism Effort: about 4 months late Filter Server SSWG
Budget: Cost-to-Completion • With 100% of major purchased equipment received or awarded, have used 99% of budgeted reserve • $55K of CTC is SAAO foreign exchange losses; use of reserve would be 92% if excluded SSWG
Budget: Deltas • Positive deltas (since last meeting/ expected) Tot • Optics and Invar actual cost overrun $52K • Machining underestimate $27K • Optomechanical (esp beamsplitter) $23K • Schedule stretchout $86K • SAAO labor ForEx losses $30K $218K • Schedule stretchout $45K? • Flattener rework and slitviewer mounting $10K? $55K? • Negative Deltas • Mechanism/ control system purchases -$21K • Dolly Design -$19K -$40K • Resale of CaF2 spares -$25K? -$25K? Projected Total $208K? ~$30K over cap with SAAO Forex ~$30K under without SSWG
Concern: Schedule • Subsystem deliveries ~ 4 months late • Used remaining schedule slack; parallel integration schedule to recover ~1.5 months • Integration & testing phase manpower: graduate student, postdoc (UW contribution) • Uncertain test phase schedule: how much needs to be done before shipping? • Ship 4 Nov, 2004 • Arrive Sutherland 15 Dec, 2004 • Uncertain commissioning schedule • telescope commissioning • sky availability of planned targets SSWG
Integration Schedule SSWG
Testing and Commissioning Schedule • This part of schedule needs to be detailed... SSWG