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

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

STOWED / DEPLOYED configuration 6.100 m Deployed Configuration 6.600 m 21.197 m 14.625 m Stowed Configuration 10.661 m 4 4.472 m

JWST in the Ariane 5 fairing D XLV 5

JWST space and ground segment L2 Point L2 Lissajous Orbit 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 Cmd Link (0.25 Kbps) S-Band Ranging Observatory – Upper Stage Separation Observatory Deployments Solar Array High Gain/ Medium Antennas Sunshield Optical Telescope Element Communications Coverage Provided For all Critical Events L2 Transfer Trajectory Ariane 5 Upper Stage Injects JWST Into Direct Transfer S-Band Tlm Link ( 2Kbps) S-Band Ranging Deep Space Network Space Telescope Science Institute Science & Operations Center GSFC Flight Dynamics Facility Ariane 5 Launch System NASA Integrated Services Network Ariane PPF S5 Communications Services for Launch (TDRS, ESA, …) Observatory / LV Clocking Angle 6

Integrated Science Instruments Module ISIM 7

JWST Thermal OTE “BIB” OTE “Frill” Backplane Support Frame (BSF) Cryogenic Radiators MIRI Radiative Shield Sunshield Membrane Management Subsystem Observatory Core Area ISIM Electronics Compartment (IEC) Sunshield Close-Out Deployed Tower Assembly MIRI Cryo-Cooler Refrigerant Deployed Line Assembly (RLDA) 8

MIRI subsystems 9

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JWST instruments 12

MIRI 13

MIRI overview 14

MIRI Imager MIRIM focal plane layout 15

Focal Plane Mask, Debris Disk MIRIM filters Filter name λ(μm) Δλ(μm) Comment F560W 5.6 1.2 Broad Band F770W 7.7 2.2 F1000W 10 2 Silicate, Broad Band F1130W 11.3 0.7 PAH, Broad Band F1280W 12.8 2.4 F1500W 15 3 F1800W 18 F2100W 21 5 F2550W 25.5 4 F2550WR Redundant Filter FND Neutral Density For Coron. Acquis. F1065C 10.65 0.53 Phase mask, NH3, silicate F1140C 11.4 0.57 Phase mask, cont. or PAH F1550C 15.5 0.78 Phase mask, cont. F2300C 23 4.6 Focal Plane Mask, Debris Disk OPAQUE Blackened Blank N/A For Darks 16

Coronograph 17

Imager filter wheel 18

Low resolution spectrograph 19

MIRIM summary 20

Calibration sources Injected through hole in pupil plane image Hot filament, non-imaging flux concentrator. One for MIRIM, one for MRS 21

Medium Resolution Spectrometer - MRS 22

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

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])

System transmissions from component dichroic transmission fts measurements

MRS channels 26

MRS Anamorphic pre-optics + IFU 27

Anamorphic pre-optics (APO) assymetric magnification square input field to rectangular image on slicer 28

IFU 29

Spectrometer main optics 30

Gratings are on the same wheels as dichroics 31

MRS IFU 32

MRS focal plane arrays 33

D2c calibration file: camera (x,y) to (lambda, s/c MRS cube reconstruction D2c calibration file: camera (x,y) to (lambda, s/c 34

MRS field and spatial resolution Channel Wavelength Pixel Size Slice Width Slices FOV Resolving Power µm arcsec # arcsec2 1 5.0 - 7.7 0.196 0.176 22 3.00 x 3.87 2400 - 3700 2 7.7 - 11.9 0.277 16 3.50 x 4.42 2400 - 3600 3 11.9- 18.3 0.245 0.387 5.20 x 6.19 4 18.3 - 28.3 0.273 0.645 12 6.70 x 7.73

MRS summary 36

Raytheon Si:As 1024x1024 BIB detectors SB305 ROIC Detectors: Focal Plane Module (FPM) Raytheon Si:As 1024x1024 BIB detectors SB305 ROIC 37

INTEGRATION RAMPS 2.7 or 27 secnds (fast/slow mode) (for full frame) 38

Subarrays Time between two frames depends on size subarray 39

REFERENCE PIXELS 40

REFERENCE OUTPUT 41

LVL1 VERSUS LVL2 LVL 1 LVL2 42

LVL2 STRUCTURE 43

LVL2 EXTENSIONS 44