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JWST S&OC Contract

JWST S&OC Contract. Peter Stockman TIPS March 20, 2003. S&OC Proposal. Original Proposal submitted November 2001 Proposed cost comparable to unsolicited proposal, (330M w fee over 10 years)

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JWST S&OC Contract

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  1. JWST S&OC Contract Peter Stockman TIPS March 20, 2003

  2. S&OC Proposal • Original Proposal submitted November 2001 • Proposed cost comparable to unsolicited proposal, (330M w fee over 10 years) • Project internal estimate: 140M (based largely on SMEX & MIDEX PI missions, inexpensive flight ops systems) • Extended review of proposal assumptions with Project in spring • Revised proposal submitted on schedule (16 Sept.) to meet 176M target. Reductions achieved by the following assumptions: • Govt. provides groundstations -- probably DSN • Govt. provides I&T test system as basis of flight operations ground system (STScI was to provide originally) • Govt. provides SI, OTE, S/C flight ops analysts for launch + 1 yr • Just-in-time development schedule (no phased development to support SI, OTE, S/C dev.) • No operations or science I&T support for SI, OTE, S/C. • Reduced support to Project and SIs but w. overguides

  3. Status of negotiations (began Jan. 15) • Contract negotiations began in mid January • Project puts back: management oversight, Project support, special studies, PRD Ops. (~ 5M) and fenced these costs off. • Project poses a new Target of 159.5 (without fee) • AURA can meet new Project target: • STScI roles are reduced significantly compared to HST (and Chandra and SIRTF experience) • SI support • Commissioning planning for SIs and spacecraft. • Calibration software • Calibration analysis • Assumes TRW develops I&T system near that needed for flight ops. • Reduced planning system capabilities: no linked observations, routine scheduling of parallel calibrations, manual planning of the weekly calendar • Late GO funding for Cycle 1 (Grants office startup delayed) • Contract will be revised after results of replan: reduced instrument complement?, delayed schedule.

  4. Key Assumptions • SI s: The three JWST instruments will have the capabilities and complexity outlined in the ASWG and Project Scientists recommendations. In particular: • The NIRCam will be a wide field, infrared camera with a limited set of fixed-band filter combinations (<20) and several elements used exclusively for wavefront-sensing. • The NIRSpec will be a multi-object, single-order spectrograph with addressable apertures and a small number of fixed-position gratings (< 6). • The MIRI will have two elements: a camera with a small number gratings and potentially a fixed pupil mask and Lyot stop for coronagraphy; a slit spectrograph with R ~1500 and a small number of fixed-position gratings. • All three instruments will have a single target acquisition mode (including PEAKUP and/or PEAKDOWN). All three instruments will have a small number of common readout schemes (<3) and a common data format.

  5. More Key Assumptions • The S&OC systems will not support parallel activities. These include parallel calibration, pure parallel or coordinated parallel observations and parallel modes within instruments. Level 2 requirement 3.2.15.4 is applicable to the Observatory. • The Fine Guidance Sensor will be sufficiently capable to enable guide star availability and selection to be done in an automated fashion by the S&OC. This assumes a wide field, highly capable guider that can satisfy the Level II requirement (3.2.15.2.2) for the 95% probability of guide star acquisition.

  6. Many Miscellaneous • The peak flight to ground data rate will be 25 GB/day. • Level 1 data products will be available at L+3 months. Level 2 data products will be available at L+6 months. • Targets of Opportunity are not supported within the time period of this contract. • Etc. (about 70 such assumptions)

  7. Current Status • Technical aspects of contract appear to be satisfactory to NASA • 2-3 week period to acquire needed signatures

  8. Replan Status • Challenge was to meet: • Stringent budget limits in FY04-07 • Launch date as close as possible to 2010 • Overall cost of 1.6B • NASA HQ has settled on Option 4i • Launch in August 2011 • About 110M cut in US instruments (down from ~ 160M) • No MIRI • 1/4 of NIRCam FOV, 1/8 NIRSpect FOV • Reduced primary mirror area (but meets spec) • Reduced testing plan • Challenged Project to save 40-50M in other areas to help restore instruments.

  9. SWG & Project Studies • SWG considering merging NIRCam and Canadian FGS: • Potential saving of accommodations (mass, computer) • Elimination of short wavelength tunable filter • Shared electronic and detector procurement • Project finding it difficult to achieve matching savings • Other possibilities: • Loss or reduced short wavelength performance. • Increased role for ESA in MIRI • Emergency meeting for SWG in April 10,11

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