Chandrayaan-2 Large Area Soft X-ray Spectrometer (CLASS)

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Presentation transcript:

Chandrayaan-2 Large Area Soft X-ray Spectrometer (CLASS) ISRO Satellite Centre, Bangalore Open University, UK Rutherford Appleton Laboratory, UK S. Narendranath (ISRO) & the CLASS team

CLASS Science COSPAR 2012

Lunar surface chemistry from X-ray spectra Global mapping of major rock forming elements Na, Mg, Al, Si, Ca, Ti, Fe Regional studies (25 km resolution) Central peak composition Ejecta material of large basins & craters Search for pyroclastic deposits Compare chemistry of small scale lava flows Secondary objective Explore chemical composition from particle induced X-ray emission (PIXE) COSPAR 2012

Experiments in the past Spectral reflectance in IR/VIS Elemental abund from band ratios X-rays Direct measurement from line flux Gamma rays COSPAR 2012

A composition hitherto un sampled Na measured in C1XS C1XS on Chandrayaan-1 : Major results A collaboration: RAL, UK & ISRO satellite centre funded by ESA & ISRO A composition hitherto un sampled Na measured in C1XS Low Ca, high Al Sodic plagioclase? Narendranath et al, Icarus, 2012 Apollo 14 site measurement Measurable PIXE Mg Al Si Ca 11 Jan 2009 Weider et al, PSS, 2012 Credit: B. Kellett, RAL

CLASS INSTRUMENT COSPAR 2012

CLASS on Chandrayaan-2 Parameter C1XS CLASS! Remarks Spectral res Geometric area (single det ) 24 cm2 ( 1cm2 x 24) 64 cm2 (4 cm2 x 16) Sensitivity 0.015 ph/cm2/s 0.009 ph/cm2/s 5σ at Si for 16s Spatial resolution 50 km 25 km At 200 km Energy range 0.8 – 20 keV 0.8 – 15 keV XRF lines from 1 - 6.4 keV Spectral res 143 eV @ 5.9 keV , -150C < 200 eV @ 5.9 keV, -200C Targeted X-ray detector SCD (CCD-54) SCD (CCD-236) Swept charge devices from e2V Operating temp Targeted: -170C Achieved:-100C Targeted: -200C Optimal temp range TBD COSPAR 2012

Swept charge device (SCD) Courtesy: A. Holland, Open university, UK COSPAR 2012

CLASS package Quadrant package with four CCD-236 Four cards for processing electronics Al door with 4 Fe-55 sources Al filters (0.2µm) for blocking visible light Cu collimator coated with gold Temperature sensor on each detector Passive cooling using heat pipes Weight = 8.5 kg Power = 26 W (raw) COSPAR 2012

Current stage of development Procurement of flight SCD (CCD-236) in progress Optimization of device underway (jointly with OU) Mechanical and thermal design analysis initiated Change transport model – version 1 ready (presented at SPIE mtg, Amsterdam (Athiray et al) – July 2012 COSPAR 2012