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SST – Space Solar Telescope

SST – Space Solar Telescope. Satellite. Solar synchronous circular orbit Orbit height: 735 km Inclination: 98.3 ° Period: 99.3 min Attitude: accuracy ± 6", stability ± 3"/s Weight: 2 ton Duration: 3 years Launch: LM-4B. Payload.

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SST – Space Solar Telescope

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  1. SST – Space Solar Telescope

  2. Satellite Solar synchronous circular orbit Orbit height: 735 km Inclination: 98.3° Period: 99.3 min Attitude: accuracy ±6", stability ±3"/s Weight: 2 ton Duration: 3 years Launch: LM-4B

  3. Payload MOT: with a 2-D polarizing spectrograph for simultaneously working in 8 channels EUT: viewing the solar corona and transition region at various temperatures HWT: whole sun viewing WBS: investigating high energy flare process SIR: nonthermal electron populations

  4. MOT 0.1  2.8'×1.5' 8 channels 2×10 -4 EUT 0.5  8.5'×8.5' 4 channels HWT 1  0.7°×0.7° WBS -ray, hard x-ray, soft x-ray SIR 1-60 MHZ

  5. Correlation Tracker Sensitivity 0.01  Time constant <1 ms Tracking accuracy ± 0.015  Control rang ± 7.5´ Close-loop bandwidth 100 Hz

  6. CT test horizontal 10Hz，vertical 11Hz, amplitude ±6 pixels Loop closed Loop opened

  7. CT open loop CT close loop

  8. On Board Data Processing

  9. PP MM DL DSP DSP CEU OBDH

  10. EUT (Phase A requirements) Based on the EUVSAT proposal. Consists of a bundle of four normal incidence telescopes mounted in a vacuum vessel, which should overlap, be well aligned and synchronized with each other and with the images of the MOT. Field of view 8.5’×8.5’ Pixel resolution 0.25” Format 2048  2048 Wave length 12.8 17.1 19.5 30.4 nm (subject to change)

  11. Detector A CCD imager is to be used with format changing optics (fiber optic taper) in front of it. In order to achieve high sensitivity, an image intensifier is proposed. A front phosphor screen is needed to converse EUV photons to visibles.

  12. Camera Configuration 1 2 3 4 5 6 7 8 9

  13. The proposal of CIOM

  14. Wave length 17.1nm FOV 8.58.5 Pixel resolution 0.4(0.25) Focal length 7.4 m Distance between Mirrors 1.817 m From PM to FP >0.1 m Primary Mirror 120 mm Secondary mirror 48 mm

  15. Camera system Requirements • 1. Inputs: • EUV image pixel & Format: 9m× 9m (0.25), 2048 ×2048 • Wavelengths & EUV Photon flux per pixel per second: (TBC)

  16. Camera system Requirements 2. Radiometric performances: • Dynamic range & linearity: >2500, 0.5% in full range • 12-bits digitization • SNR: >250

  17. Camera system Requirements 3. Temporal Resolution: < 2 sec. 4. Dimensions and Weights • Overall size: <100mm×150mm • Total Weight: <2.5Kg/each Camera set

  18. Camera system Requirements 5. Power supply: 25~30v input , <10 watt/each camera set 6. Operational Environments • Radiational: ToT: 20Krad(Si) SEU/L: TBD • Thermal: -20ºC~+50ºC, passive cooler for CCDs • EMC: TBD • Vibration, Shock, etc.

  19. Camera System pecifications • Front illuminated CCD, size 2048×2048 pixels. • Pixel size on CCD 14 m × 14 m, resulting in 28.6mm × 28.6mm image size. • CCD operated in full-frame mode. • Readout simultaneously through 2 channels; failure mode with readout through the remaining functional channel. • CCD operated in MPP mode, with low dark charge and noise. • Correlated double sampling (CDS) with digitizing by 12 bit ADCs.

  20. Main Difficulties on EUT instrumentation Resolution: the optics and the detector Test on observation wavelength.

  21. EUT Financing Before 2003 0.8M RMB NAOC 2003 2.0M RMB NSFC 2004 2.0M RMB NAOC

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