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Coronas-Photon Project The RT-2 experiment

Coronas-Photon Project The RT-2 experiment. CORONAS-PHOTON mission is the third satellite of the Russian CORONAS program on the Solar activity observations.

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Coronas-Photon Project The RT-2 experiment

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  1. Coronas-Photon ProjectThe RT-2 experiment

  2. CORONAS-PHOTON mission is the third satellite of the Russian CORONAS program on the Solar activity observations. The main goal of the CORONAS-PHOTON mission is the study of the Solar flare hard electromagnetic radiation in the wide energy range from Extreme UV up to high energy gamma - radiation (~2000MeV)

  3. Sattelite CORONAS-PHOTON STEP-F TESIS KONUS-RF-anti pressure vessel PHOKA RT-2/GA RT-2/S KONUS-RF N-2M RT-2/G PINGUIN Magnetometer

  4. CORONAS-PHOTON mission summary

  5. Instruments for optics and X-ray radiation

  6. Orbit and Launcher Satellite CORONAS – PHOTON (METEOR type) Weight <2250kg Launcher: Cyclon-3M Cosmodrome: Plesetsk Orbit: Circular 500-550 km. Inclination 82.5 deg Nominal mission lifetime 3 years Extended 5 years Telemetry 8.2 GHz; Onboard memory 1.0Gbyte Data transmission rate 7.68Mbits/sec Launch: Januray 30, 2009.

  7. Effective areas

  8. Solar activity launch date

  9. NaI(Tl) CsI(Na) PMT Dynode chain 3 detectors (2 phoswich + 1 CZT & CMOS) 1 electronics box

  10. Aschwanden, 07 • 89 solar flares • Eth = 18.0+3.4 keV •  = 6.9+0.9 (10 – 20 keV) •  = 3.5+1.1 (30 – 50 keV) • Width typically 100 s at high energies • Use Lin et al. 20 keV flux for flare frequency

  11. Solar Hard X-ray Observations

  12. RT-2 / S & RT-2/CZT Detector Modules

  13. Detector interface Det_1 (P) RT2-S Satellite interface Det_2 (P) RT2-G Processing Electronics Det_3 (CZT) Total Satellite Payload

  14. Design (RT-2CZT) CAM Assembly Collimator Assembly FZP (2 pairs) Detector Housing CMOS CCD instead Of 1 CZT module CZT Detectors

  15. Coded Mask Imaging Concept Multiple pin-hole MASK Mask casts shadow on detector plane Shift of shadow pattern encodes source location Cross correlation of mask pattern with shadow recovers shift and locates sources

  16. Fresnel’s Zone Plate • It is made up of Tungstun of 1 mm thickness and alternate solid and hollow regions with flanges to support the overall structure. • rn = (n)1/2 x r1 where, r1 = radius of innermost disc

  17. Implementation of Zone Plate

  18. CMOS CCD Detector • RadEye 1Premium quality • 25 by 50 mm active area • 5,24,288 pixels (512 x 1024) • Pixel size and intrinsic resolution 48µm (Silicon Photodiodes) • Dark current (at 23°C) – 4000 e-/s • Noise (at 1 fps) – 150 e-/s • Frame rate – 0.01 to 4.5fps • Operating temperature – 0 to 50°C • Dark current doubles approx. every 8°C • Threshold about 150 keV • 30 keV with processing; cooling; low noise

  19. Configuration Concentrate on > 25 keV flares Wide bandwidth required: one Phoswich Change to > 25 keV CZT: Coarse imaging (correct to a few Arcmin to as low an energy threshold as possible) Imaging: A few arcseconds, particularly at high energies RT-2/S: 15 - 120 keV; upto 20000 counts/s; M class flares RT-2/G: 25 - 120 keV; upto 20000 counts/s; X class flares (use Aluminum window) RT-2/CZT: Three CZT detectors; upto 100,000 cts/s CZT1: 10 - 100 keV; CAM; 2 arcminutes CZT2: 25 - 100 keV; CAM. 2 arcminutes CZT3: 25 - 100 keV; FZP 1 arcminutes One CMOS detector: 30 - 100 keV FZP 2 arcseconds

  20. Salient Features … • Fastest time resolution : 0.3 ms (event mode; maximum 2500 counts/s) • Normal mode: 8 channel counts : 10 ms • All spectra : 1 s • Total 6 kbytes in spectral mode • 32 kbytes in event mode (7800 events)

  21. Modes • Debug mode - by command • Solar Quiet mode - by command (100 s; 1 s) • Solar flare mode - onboard intelligence (10 s; 0.1 s) • SAA mode – by good/bad signal • Earth occultation mode – by light/shadow signal

  22. Data management • RT-2/S & G • 1 s count rates + 100 s spectrum throughout. • 100 ms count + 10 s spectrum from 1 hr of flare data (threshold from > 25 keV counts) • 10 ms count + 1 s spectrum from 20 minutes flare data • CZT: 1 s count + 100 s image throughout • CMOS: 1 s count + 100 s image for 1 hr of flare data.

  23. Thanks

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