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WFIRST Telescope Study Preliminary Analysis Renaud Goullioud, Gary Kuan, Jim Moore, Eric Sunada, Juan Villalvazo, Zensheu Chang JPL in collaboration with.

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Presentation on theme: "WFIRST Telescope Study Preliminary Analysis Renaud Goullioud, Gary Kuan, Jim Moore, Eric Sunada, Juan Villalvazo, Zensheu Chang JPL in collaboration with."— Presentation transcript:

1 WFIRST Telescope Study Preliminary Analysis Renaud Goullioud, Gary Kuan, Jim Moore, Eric Sunada, Juan Villalvazo, Zensheu Chang JPL in collaboration with the Goddard team 11/18/20151SDT#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. 11/18/2015SDT#7 Telescope2

3 Telescope CAD model 11/18/2015SDT#7 Telescope3 Primary Mirror Imager Tertiary Mirror Secondary Mirror Imager Feed Mirror Imager Fold Mirror

4 Telescope Mass Breakdown 11/18/2015SDT#7 Telescope4 OTA Mass Breakdown by material: kg M55J (composite structures, tubes)375.3 Titanium (mirror mounts)21.8 Stops and cans (Aluminum)2.8 OTA mount53.6 ULE (mirrors)127.4 Mechanical (mechanisms)18.8 MLI (thermal blankets)19.8 kapton (heaters)13.9 PRTs (thermal sensors)0.7 Telescope electronics (chassis+boards)16.4 Cabling39.0 Instruments154.3 Radiators34.3 Contingency282.3 TOTAL (including 21.3kg electronics)1160.2

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 11/18/2015SDT#7 Telescope5

6 Mode 1 17.78 Hz, Telescope moves from side to side Mode 2 18.77 Hz, Telescope moves from front to back Telescope First Mode 11/18/2015SDT#7 Telescope6

7 WFIRST Thermal Model 7 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 11/18/2015SDT#7 Telescope

8 Temperature Plot (at Nominal orientation) 811/18/2015SDT#7 Telescope

9 Thermal Model - Cutout view 911/18/2015SDT#7 Telescope

10 Primary, Secondary and Fold Mirrors (Nominal) 10 Primary mirror Secondary mirror IMC Feed IMC Tertiary IMC Fold 11/18/2015SDT#7 Telescope

11 Spacecraft Orientation (View From the Sun) Nominal Roll 10 deg, Pitch 36 deg 11/18/2015SDT#7 Telescope11

12 Thermal Results Summary 12 Component NominalRoll 10, Pitch 36 Max. T, °KMin. T, °KAvg. T, °K Heater Power at 220K, W Max. T, °KMin. T, °KAvg. T, °K Heater Power at 220K, W Baffle215.8126.0163.4--215.8123.8162.5-- Primary mirror220.1217.8219.827.2220.1217.7219.827.5 Rear Encl.226.0189.4215.973.3226.2188.9215.771.2 Secondary mirror220.1219.5219.94.2220.1219.5219.94.2 Tertiary 1220.1217.9219.30.9220.1217.9219.30.9 Tertiary 2220.1218.0219.40.9220.1218.0219.40.9 Fold mirror 1220.0218.7219.47.0220.0218.7219.47.3 Fold mirror 2220.0218.8219.37.5220.0218.8219.37.7 Strongback222.8197.2216.158.1222.7196.9216.064.6 Rooftop mirror 1220.1219.0219.50.4220.1219.0219.50.4 Rooftop mirror 2220.1218.4219.40.5220.1218.4219.40.5 Rooftop mirror 3220.2218.5219.50.5220.1218.4219.50.5 Rooftop mirror 4220.0219.1219.50.4220.0219.0219.50.4 Feed Structure220.4215.2218.524.5220.4215.1218.425.2 Imager mirror216.5216.0216.3--216.4215.8216.1-- Imager tertiary218.4217.4217.8--218.4217.4217.8-- Imager fold mirror218.7217.5218.1--218.7217.4218.1-- Total205.4Total211.7 11/18/2015SDT#7 Telescope

13 Temperature Change vs. Orientation Delta_T ( T_nominal – T_ Roll 10 pitch 36) 13 Primary mirror Front Back Secondary mirror 11/18/2015SDT#7 Telescope

14 Temperature Change vs. Orientation Delta_T ( T_nominal – T_ Roll 10 pitch 36) 11/18/2015SDT#7 Telescope14 Tertiary Front Back Imager Fold

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. 11/18/2015SDT#7 Telescope15

16 Heaters off: Telescope Temperature Secondary mirror Primary mirror Imager Fold mirror 11/18/2015SDT#7 Telescope16

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