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MIRI in a nutshell

MIRI in a nutshell. Bart Vandenbussche KU Leuven MIRI team meeting Leuven, 20 june 2013. 1. Optical Telescope Element (OTE) 6 meter Tri-Mirror Anastigmatic 18 Segment Primary Mirror. Integrated Science Instrument Module (ISIM) Located inside an OTE provided ISIM Enclosure

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MIRI in a nutshell

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  1. MIRI in a nutshell Bart Vandenbussche KU Leuven MIRI team meeting Leuven, 20 june 2013 1

  2. Optical Telescope Element (OTE) • 6 meter Tri-Mirror Anastigmatic • 18 Segment Primary Mirror • Integrated Science Instrument Module (ISIM) • Located inside an OTE provided ISIM Enclosure • Contains 4 Science Instruments (NIRCam, NIRSpec • MIRI, FGS / TF) OTE Backplane / ISIM Enclosure • Thermal Region 1 • Components cooled to • cryogenic temperatures • Thermal Region 2 • Components maintained at • ambient temperatures on cold • side of the observatory OTE Secondary Mirror Aft Optics Subsystem ISIM Electronics Compartment (IEC) OTE Primary Mirror OTE Deployment Tower SS Layer 5 SS Layer 1 Momentum Trim-Tab • Sunshield (SS) • 5 layers to provide thermal • shielding to allow OTE and ISIM • to passively cool to required • cryogenic temperatures Solar Array • Spacecraft Bus • Contains traditional • “ambient” subsystems Thermal Region 3 - Components maintained at ambient temperatures JWST elements

  3. STOWED / DEPLOYED configuration 6.100 m Deployed Configuration 6.600 m 21.197 m 14.625 m Stowed Configuration 10.661 m 4.472 m

  4. XLV D JWST in the Ariane 5 fairing

  5. Communications Coverage Provided For all Critical Events • Observatory Deployments • Solar Array • High Gain/ Medium Antennas • Sunshield • Optical Telescope Element L2 Point Ariane 5 Upper Stage Injects JWST Into Direct Transfer Trajectory Observatory – Upper Stage Separation L2 Lissajous Orbit L2 Transfer Trajectory S-Band Tlm Link ( 2Kbps) S-Band Cmd Link (0.25 Kbps) S-Band Ranging Ariane 5 Launch System One 4 Hour Contact with the Ground Every 12 Hours Ka-Band Science Link ( Selectable 7, 14, 28 Mbps) S-Band Tlm Link (Selectable 0.2 - 40 Kbps) S-Band Cmd (Selectable 2 and 16 Kbps) S-Band Ranging S-Band Tlm Link ( 2Kbps) S-Band Ranging Observatory / LV Clocking Angle Deep Space Network Communications Services for Launch (TDRS, ESA, …) Space Telescope Science Institute Science & Operations Center NASA Integrated Services Network Ariane PPF S5 GSFC Flight Dynamics Facility JWST space and ground segment

  6. Integrated Science Instruments Module ISIM

  7. OTE “Frill” Cryogenic Radiators OTE “BIB” MIRI Radiative Shield Sunshield Membrane Management Subsystem Backplane Support Frame (BSF) • Observatory Core Area • ISIM Electronics Compartment (IEC) • Sunshield Close-Out • Deployed Tower Assembly • MIRI Cryo-Cooler Refrigerant Deployed • Line Assembly (RLDA) JWST Thermal

  8. MIRI subsystems

  9. JWST instruments

  10. MIRI

  11. MIRI overview

  12. MIRI Imager MIRIM focal plane layout

  13. MIRIM filters

  14. Coronograph

  15. Imager filter wheel

  16. Low resolution spectrograph

  17. MIRIM summary

  18. Calibration sources • Injected through hole in pupil plane image • Hot filament, non-imaging flux concentrator. • One for MIRIM, one for MRS

  19. Medium Resolution Spectrometer - MRS

  20. Spectrometer pre-optics LT: light trap BF: blocking filter Dichroics on 2 dichroic wheel assemblies Wheel 1: 1a / 1b / 1c Wheel 2+3: 2a+3a / 2b+3b / 2c+3c

  21. MRS dichroic filtering scheme System transmissions: S[1a] = (1 - t[1a]) * t[blocking1] S[1b] = (1 - t[1b]) * t[blocking1] S[1c] = (1 - t[1c]) * t[blocking1] S[2a] = t[1a] * (1 - t[2a]) * t[blocking2] S[2b] = t[1b] * (1 - t[2b]) * t[blocking2] S[2c] = t[1c] * (1 - t[2c]) * t[blocking2] S[3a] = t[1a] * t[2a] * (1 - t[3a]) S[3b] = t[1b] * t[2b] * (1 - t[3b]) S[3c] = t[1c] * t[2c] * (1 - t[3c]) S[4a] = t[1a] * t[2a] * t[3a]) S[4b] = t[1b] * t[2b] * t[3b]) S[4c] = t[1c] * t[2c] * t[3c])

  22. System transmissions from component dichroic transmission fts measurements

  23. MRS channels

  24. MRS Anamorphic pre-optics + IFU

  25. Anamorphic pre-optics (APO) • assymetric magnification square input field to rectangular image on slicer

  26. IFU

  27. Spectrometer main optics

  28. Gratings are on the same wheels as dichroics

  29. MRS IFU

  30. MRS focal plane arrays

  31. MRS cube reconstruction D2c calibration file: camera (x,y) to (lambda, s/c

  32. MRS field and spatial resolution

  33. MRS summary

  34. Detectors: Focal Plane Module (FPM) Raytheon Si:As 1024x1024 BIB detectors SB305 ROIC

  35. INTEGRATION RAMPS 2.7 or 27 secnds (fast/slow mode) (for full frame)

  36. Subarrays Time between two frames depends on size subarray

  37. REFERENCE PIXELS

  38. REFERENCE OUTPUT

  39. LVL1 VERSUS LVL2 LVL 1 LVL2

  40. LVL2 STRUCTURE

  41. LVL2 EXTENSIONS

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