Prime Focus Imaging Spectrograph Status

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 gt96 awarded, use of budget reserve is 77
• Concerns schedule

2
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

3
Collimator
Fused Quartz
CaF2
CaF2
CaF2
(NaCl)
Fused Silica
CaF2
4
Camera
Fused Silica
CaF2
CaF2
(Fused Silica asphere)
Fused Silica
NaCl
(Fused Silica pickup)
(Fused Silica field flattener)
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
Fabry-Perot Etalons
6
Structure Mechanisms
Slitmask Mechanism
Structure Base Jig
Waveplate Mechanism
7
Procurement Status
Item PDR Estimate Now Low bid Low bid Other bidders Status
Item PDR Estimate Now Company Delivery Other bidders Status
CaF2 Blanks 98,116 120,260 Oken 80d Bicron Received, including 32,800 in spares
Fused Silica Blanks 98,116 9975 Dynasil 4 wk Corning, Oken Received, including 1 spare
NaCl Blanks 98,116 10,020 Hilger 6 wk Rubicon Received, including 4 replacements
Fused Quartz Blanks 98,116 13,650 Oken 75 d Heraeus Received
Lens Fab- asphere 168,714 33,000 Coastal 20 wk TORC, Tinsley Awarded
spheres 168,714 31,215 Janos 8 wk Coastal, TORC, HJOL Awarded
MgF2/ Solgel coatings 55,918 Cleveland Crystal 8 wk soliciting more Awarded
Multilayer Coatings 12,300 Spectrum Thin Films 6 wk RMI Awarded
Waveplates 120,000 83,000 Halle 6 mo none Awarded
Beamsplitter 44,100 53,100 Karl Lambrecht 30 wk Reynard Awarded
8
Procurement Status - II
Item PDR Estimate Now Low bid Low bid Other bidders Status
Item PDR Estimate Now Company deliv Other bidders Status
VPH Substrates 30,000 11,850 United Lens 30 d HJOL, Coastal Received
VPH Coatings 30,000 3,975 Spectrum Thin Films Spectrum Thin Films Quotation
VPH Fabrication 30,000 24,950 Wasatch 8 wk CSL, KOSI Awarded
SR Grating 8,696 Richardson 10 wk Zolotech Quotation
Color Filters 10,000 10,000 Estimate
Slitviewer Optics 4,700 TORC 6 wk Coastal, HJOL, Edmund, Zygo Awarded
Slitmask Cutter 120,000 123,405 US Laser 4 mo LPKF, ART Awarded
Total 590,930 610,014
9
Budget Cost-to-Completion

• With gt96 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

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

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

12
Mechanical Schedule
13
Optics Schedule
14
Control System
15
Testing and Commissioning Schedule
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?