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MIRIS, Compact Wide-Field IR Space Telescope System Design

MIRIS, Compact Wide-Field IR Space Telescope System Design. Wonyong Han Dae-Hee Lee, Uk-Won Nam, Youngsik Park, Woong-Seob Jeong, Chang Hee Ree, Bongkon Moon, Sung-Joon Park, Sang-Mok Cha, Jang-Hyun Park, Duk-Hang Lee, Kwang-Il Seon, In-Soo Yuk, Hyung Mok Lee,

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MIRIS, Compact Wide-Field IR Space Telescope System Design

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  1. MIRIS, Compact Wide-Field IR Space Telescope System Design Wonyong Han Dae-Hee Lee,Uk-Won Nam,Youngsik Park, Woong-Seob Jeong, Chang Hee Ree, Bongkon Moon, Sung-Joon Park, Sang-Mok Cha, Jang-Hyun Park,Duk-Hang Lee, Kwang-Il Seon, In-Soo Yuk,Hyung Mok Lee, Sun Choel Yang, Jong-Oh Park, Seung-Wu Rhee, Toshio Matsumoto Korea Astronomy & Space Science Institute (KASI)

  2. Background - Korea Sci & Tech Satellite (STSAT) began 1999 - FIMS : KASI developedFIMS,Main Payload of STSAT-1, in collaboration with KAIST & UC Berkeley - STSAT-1 (FIMS) Launched in 2003 - FIMS Science Results were Published on ApJL in 2006 - STSAT-3 Program started in 2007 - KASI Proposal, MIRIS was Chosen as Main Payload - MIRIS is compact wide-field IR Space Telescope [ Multi-purpose Infra-Red Imaging System ]

  3. STSAT1– FIMS (Far UV IMaging Spectrograph)

  4. Parabolic Cylinder Mirror Detector Assembly UV Lights From Space Grating L & S Slit & Shutter Assembly FIMS Optical System

  5. Card Cage Structure Detector Box Amp Unit Vacuum Box Enable Plug Shutter box Mirror house Vacuum Pumping Port Sun Warning Sensor Vacuum Valve Shaft Opening Door FIMS Flight Model

  6. FIMS & STSAT-1 (Sci & Tech SAT-1)

  7. Launch : 27 Sep 2003 Russia, Plesetsk By Cosmos Rocket Successfully Launched

  8. FIMS : Main Science Supernova Explosion Galaxy Models for Hot Gas What’s the nature of the Hot Gas in our Galaxy ? Still Unknown... ? To Study Distribution, Properties of Hot Gas, ISM in Galaxy

  9. FIMS Heritage • ApJL, 2006, Vol 644, Special Issue - First results from the FIMS Mission - 9 papers published including Instruments & System Performances Total diffuse intensity map of the sky for the SPEAR/FIMS L-band (1360-1730 A) observations. Evident features include the Galactic plane, the Sco-Cen association, and the LMC.

  10. MIRIS Multi-purpose Infra-Red Imaging System The Main Payload of STSAT-3

  11. MIRIS Project Summary • Objectives • Space observation camera (SOC) • Pa-α emission line Galactic plane survey • Extragalactic Cosmic IR Background (CIB) observation • Earth observation camera (EOC) • Wide angle NIR imaging of Korean peninsula • Developing space IR technologies • Duration: 2007. 05~2011. 04 (4 years) • Budget: ~ 3M USD • Participants : KASI, KBSI, SNU, Green Optics • Spacecraft : STSAT-3 (SaTReC, KAIST)

  12. MIRIS : Scientific Goal (1/3) Galactic Plane Survey (1/2) Origin of the Warm Ionized Medium (WIM) Challenge to the current paradigm of the Ionization theory Test the effect of Dust scattering for the WIM observation Observation : Pa survey Pa (MIRIS) vs. H (Ground-based): Scattering difference Pa is better than H in the turbulence study of the WIM because of the lower dust-extinction Hαmap from a ground-based survey

  13. Scientific Goal (2/3) Galactic Plane Survey (2/2) Physical Properties of Turbulence in the Galaxy Survey the physical parameters of turbulence in the Galaxy Derive Magnetic field strength from the structure characteristics of turbulence Observation : Pa survey Pa (MIRIS) vs. H (Ground-based): Extinction difference Measurement of the turbulence structure Turbulence model

  14. Scientific Goal (3/3) Cosmic Infrared Background (CIB) Observation Origin of the Near-IR CIB Test the hypothesis of the Pop III origin Confirm the degree-scale fluctuation suggested by IRTS &AKARI and reveal its nature Observation : I & H-band I-band (no Pop III) vs. H-band (Pop III expected) Matsumoto et al. 2005 Spectral bump suspected to be redshifted from the Pop III Ly-cutoff Degree-scale fluctuation in the power spectrum from IRTS

  15. CIB Observational Plan • Filters: I & H bands • Blank (dark calibration) • CIB dedicated phase: 1 month • Primary target • NEP (North Ecliptic Pole) • 6.2 sq. deg. observed by AKARI • Whole area: 10ox10o • 7 x 7 fields • 1 sec. integration x 600 frames • Secondary targets • SEP (South Ecliptic Pole) • NGP (North Galactic Pole) • SGP (South Galactic Pole) MIRIS NEP Obs Region : AKARI Obs Region : MIRIS FoV

  16. MIRIS System Design

  17. STSAT-3 Layout Space Observation Camera Star Tracker Sun Avoidance = ±90 degree Earth Avoidance = ±30 degree Earth Observation Camera Sun Avoidance = ±30 degree Secondary Payload, COMIS

  18. STSAT-3 Summary

  19. MIRIS Specifications

  20. MIRIS Sensitivity • Filters: I & H bands, Blank • 1sec 600 frame • Readout noise = 40 e- • Photon noise • Thermal emission • Zodiacal light • Extragalactic component • Expected Sensitivity (3) (Instrumental noise only) • I band: 18.0 AB mag. • H band: 17.8 AB mag.

  21. MIRIS Space Observation Camera (SOC)

  22. MIRIS Space Observation Camera (SOC)

  23. MIRIS Optics Specification • Specifications of Space Observation Camera • Wavelength: 0.9 ~ 2m − Aperture: 80 mm • Pixel FOV: 51.6 arcsec − Detector FOV: 3.67o x 3.67o • Telescope & Sensor Temp.: 180 ~ 200K (Passive Cooling), 100K • Filters (6 filters) • I (1.05m), H (1.6m), blank • Pa  (1.876m), Pa  Cont1, Pa  Cont2 • Pa  Cont1, Pa  Cont2 → Double band filter

  24. MIRIS Array Specification PICNIC sensor

  25. SOC Filter System

  26. Performance of SOC Optics

  27. SOC Layout

  28. Spacer Barrel G5 G4 G3 G2 G1 Flexure Lens Retainer SOC Optics • Operation temp. : 300K => 180K Flexure

  29. Fabricated Parts Re-assembly Unit: mm * For Lens Stress Re-calculation, Lens Gap Inspection, and Lens Contact Inspection

  30. SOC Dewar

  31. Assembled SOC Dewar Layout

  32. Attitude control requirements

  33. Data Communication Requirements * RS Encoding& Packet frame were NOT included

  34. Passive Cooling for SOC (1/2)

  35. Passive Cooling for SOC (1/2) Temperature profile during one orbit (1) The telescope can be cooled below the goal temperature of 200K (2) The detector can be cooled below the goal temperature of 80K

  36. MIRIS Electronics

  37. MIRIS Electronics Box

  38. SOC Electronics SOC READOUT UNIT DSP UNIT FPGA PATTERN GENERATOR CONTROL COMMAND BIAS CLOCK Q1 Q2 4 channel VIDEO Siganal Processing FIFO FIFO Q3 Q4 AMP ADC IMAGE DATA DECODER AMP ADC MEMEORY IMAGE BUFFER MMS PICNIC 256256 ARRAY AMP ADC GSE AMP ADC

  39. MIRIS Operation

  40. Observation Plan • CIB : NEP/SEP • Galactic plane survey: Eclipse period

  41. MIRIS Operation Concept

  42. Plan for Galactic Plan Survey 6°

  43. Plan for Galactic Plan Survey

  44. Current Status : Dewar

  45. Current Status : Optics 2009. 4. 6. ~ 2009. 4. 10. (Genesia)

  46. Test Plan Part System Module • Optics • Lens (SO, EO) • Barrel (SO, EO) • Baffle (SO, EO) • SO • Cooling test • Focus test • Noise test • Optics • SO Function test • EO Function test • Mechanics • Filter wheel test (SO) • Mechanics • E-box • Dewar/Filters (SO) • Cooler box/Cooler (SO) • Skin (SO, EO) • MLI (SO) • Supporters (SO) • EO • Field test • Electronics • Image acquisition (SO) • Image acquisition (EO) • SCIF test • Radiation test • Environmental test • Vibration test • Thermal/Vac test • Electronics • PCBs • Harness/Connectors • Sensors • Test Equipment • Vacuum chamber • Collimator • Light source • GSE

  47. Test Equipment Monochrometer Integrating sphere Thermal-cryo vacuum chamber Collimator & Optical Table

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