MIRIS. Korean Compact Infrared Space Telescope, MIRIS

Transcription

1 Korean Compact Infrared Space Telescope, D.-H. Lee 1, W.-S. Jeong 1, Y. Park 1, C.H. Ree 1, U.-W. Nam 1, B. Moon 1, S.-J. Park 1, S.-M. Cha 1, J. Pyo 1, J.-H. Park 1, K. Seon 1, D. Lee 1,2, S.-W. Rhee 3, J.-O. Park 3, H.M. Lee 4, T. Matsumoto 4,5, W. Han 1 & S. Matsuura 5, 1 KASI, Korea, 2 UST, Korea, 3 KARI, Korea, 4 ASIAA, Taiwan, 5 ISAS/JAXA, Japan 1

2 Contents 1. Satellites for Space Observation in Korea 2. Science & Technology Satellite III 3. Overview of Project 4. Development of 5. Environment Test 6. Calibration of 7. Launch Campaign 2

3 Space Observation Program in Korea Science & Technology Satellite Series l 1 st satellite: FIMS (Far-ultraviolet IMaging Spectrograph) (2003) l 2 nd Satellite: Observation of Space environment by Korean Launcher Naro l 3 rd Satellite: (Multipurpose Infrared Imaging System) (Seon et al. 2011) ST-SAT II

4 Science & Technology Satellite III Primary & Secondary Payloads l : first infrared camera in space SOC CSS S-band Ant. X-band Ant. SOC Sun-shade Z Y X y x z 4

5 Specifications of Specifications of Space Observation Camera l Wavelength: 0.9 ~ 2mm Aperture: 80 mm l Detector FOV: 3.67 o x 3.67 o (Pixel : 51.6 arcsec) (c.f. Nyq. 1.6mm = 4.1 arcsec) limited by satellite stability l Telescope & Sensor Temp.: 180K (Passive Cooling), 90K l Filters (5 filters) I (1.05mm), H (1.6mm), blank Pa a (1.876mm), Pa a Cont

6 Scientific Objectives (1/3) Paa Emission Line Survey : Galactic plane & WIM Origin of Warm Ionized Medium l Previous study of WIM: Photoionization model l Recent study of WIM from FIMS: dust scattering l Verification of the dust scattering theory Physical properties of interstellar turbulence l Structure of WIM l Comparison between Paa () vs. Ha Monte-Carlo simulation Uniform dust distribution; E(B-V) = 0.1 Point source or Spherical H II region

7 Scientific Objectives (2/3) Observation of Cosmic Infrared Background (CIB) l CIB from POPIII stars l Spectral peak of CIB l Large scale fluctuation of CIB 100 IRTS/NIRS DIRBE/COBE Madau and Pozzetti 2000 Wright and Rees 2000 Fazio et al Cambrecy et al model by Totani et al Bernstein et al Totani et al residual_summary Matsumoto et al Surface brightness (nw/m 2 /sr) Large-scale structure of CIB from IRTS observation Wavelength (mm)

8 Parameter Space of CIB Spitzer / GOODS Parameter space for :

9 Scientific Objectives (3/3) Zodiacal foreground l Calibration purpose: 2 orbits /day l Simultaneous observation of NEP & SEP in 1 orbit l Monitoring of ZL in SEP and NEP: I & H bands Revision of ZL Model & Removal of ZL component

10 Optomechanical Design Optomechanics l Outer & Inner parts l Dewar & cooler l Passive cooling: radiator, GFRP supporter, winston cone baffle, thermal shield

11 Optical Design Wavelength Aperture Specifications um 80 mm Focal ratio f/2 Effective Focal Length 160 mm Pixel FOV 51.6 X 51.6 Detector FOV 3.67 x 3.67 Telescope Temperature Sensor/Filter Temperature Sensor Model Pixel Size Sensor Dimension Detecting Area < 200K < 100K Specifications of sensor Teledyne PICNIC (MCT) 40 um X 40 um 256 X mm X 10.2 mm 11

12 Mechanical & Thermal Analysis FEM analysis l Safety factor > 4 in all directions Thermal analysis l Worst hot & cold cases in all directions Stress in x direction 12

13 Parts of Thermal shield Box Cooler Box Radiator Bracket Auxiliary plate GFRP pipe supporter Dewar Winston cone baffle Barrel 13

14 Assembly of Dewar SOC filter SOC filter wheel SOC dewar 14

15 Environmental Test Passive Cooling Confirmation of Passive Cooling : telescope < 200K SOC Radiator Cold Plate (Velvet-painted) 15

16 Environmental Test Thermal/Vacuum Test l Thermal cycles Temperature(K) Vacuum(Torr) T0 200 T1 T2 180 T3 T4 160 T5 1e+4 1e+3 1e+2 1e+1 1e+0 1e-1 1e-2 1e-3 1e-4 1e-5 1e-6 1e Time(Hrs) 16

17 Environmental Test Vibration/Shock, TID Test l Vibration/Shock Profile : and E-Box l Total Integration Dose Test: radiation exposure ~30K rad 11g rms E-Box 17

18 Calibration - Focus Test Beam profile: Gaussian l System MTF: ~30% 18

19 Calibration - Dark Test Gaussian: readout noise Temperature variation: ~3K l Increase of hot pixels: ~0.26% l Increase of noise < 1 ADU l No difference of dark on temperature variation Noise map ADU/s 19

20 Calibration - Gain Estimation Mean-Variance Test l l Readout noise (s r ) : Gaussian constant l Photon noise (s p ) : Poissonian increasing Mean-Variance l Readout noise ~ 45e - l 45e - < 50e - (performance estimation) Readout noise dominant signal Photon noise 20

21 Calibration - Flat Data Uniform source by integration sphere Flat fielding for H & Pa bands l Deviation: reduction of 50%, 42% for H and Pa cont., respectively l Flatness < 1% Before H After Before Pa Cont. After 21

22 MLI (Multi-Layer Insulation) Wrapping Heat-pass plate MLI 30 layers Interface plate 22

23 Final Functional Test Imaging test : OK Operation of filter wheel : OK Cooler ON/OFF: OK SOH data: OK 23

24 Launch Campaign 24

25 Launch Campaign 25

26 Launch Campaign 26

27 Launch Campaign 27

28 First Images M31 Orion Nebula Rose Nebula

29 Q A & 29