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WFIRST Telescope Study Preliminary Analysis

WFIRST Telescope Study Preliminary Analysis. Renaud Goullioud, Gary Kuan , Jim Moore, Eric Sunada , Juan Villalvazo , Zensheu Chang JPL in collaboration with the Goddard team. Telescope Modeling Status. Completed detailed CAD model. Completed Thermal model.

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WFIRST Telescope Study Preliminary Analysis

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  1. WFIRST Telescope StudyPreliminary Analysis Renaud Goullioud, Gary Kuan, Jim Moore, Eric Sunada, Juan Villalvazo, Zensheu Chang JPL in collaboration with the Goddard team SDT#7 Telescope

  2. Telescope Modeling Status • Completed detailed CAD model. • Completed Thermal model. • Completed Finite element model. • Competed Optical Tolerancing model. • Modeled Ground Alignment of Telescope: • Requires 5 DoF on SM and tip/tilt of ImC Fold mirror • Requires tip/tilt of SpC F2 and tip/tilt/piston of SpC TM • Modeled Ground to On-orbit Gravity shift: • Gravity shift can be taken out by the SM mechanism 5 DoF. SDT#7 Telescope

  3. Telescope CAD model Secondary Mirror Primary Mirror Imager Tertiary Mirror Imager Feed Mirror Imager Fold Mirror SDT#7 Telescope

  4. Telescope Mass Breakdown SDT#7 Telescope

  5. Telescope Finite Element Model Node count: 103,219 Element count: 209,748 Mass: 1,139.0 kg Element type: CBAR: 305 CHEXA: 16,776 CONM2: 14 CPENTA: 6,798 CQUAD4: 91,648 CTETRA: 81,790 CTRIA3: 12,115 CTRIA6: 202 RBAR: 8 RBE2: 69 RBE3: 23 Boundary conditions: Ends of the 3 bipods fixed SDT#7 Telescope

  6. Telescope First Mode Mode 1 Mode 2 17.78 Hz, Telescope moves from side to side 18.77 Hz, Telescope moves from front to back SDT#7 Telescope

  7. WFIRST Thermal Model 9006 TD/RC Nodes 23 User Nodes 8 boundary (SC at 313.2K) 3538 MLI (non graphical) Surfaces 8675 planar elements 413 surfaces 50 heaters SDT#7 Telescope

  8. Temperature Plot (at Nominal orientation) SDT#7 Telescope

  9. Thermal Model - Cutout view SDT#7 Telescope

  10. Primary, Secondary and Fold Mirrors (Nominal) IMC Tertiary IMC Feed Secondary mirror IMC Fold Primary mirror SDT#7 Telescope

  11. Spacecraft Orientation (View From the Sun) Nominal Roll 10 deg, Pitch 36 deg SDT#7 Telescope

  12. Thermal Results Summary SDT#7 Telescope

  13. Temperature Change vs. Orientation Delta_T ( T_nominal – T_ Roll 10 pitch 36) Front Back Primary mirror Secondary mirror SDT#7 Telescope

  14. Temperature Change vs. Orientation Delta_T ( T_nominal – T_ Roll 10 pitch 36) Front Fold Back Imager Tertiary SDT#7 Telescope

  15. Next Steps • Apply temperatures to the Finite Element Model. • Calculate wavefront error stability using optical modal. • Reduce temperature to 200K. • Calculate wavefront error stability. • Turn off thermal control (160-180K). • Calculate wavefront error stability. SDT#7 Telescope

  16. Heaters off: Telescope Temperature Secondary mirror Primary mirror Imager Fold mirror SDT#7 Telescope

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