1. CZT Imager for ASTROSAT CONFIGURATION

2. CZT Module

3. 256 ampli. (ASIC) 1 microsec; Isolation; fast ADC; FPGA LabView; Analysis Imarad CZT + Ideas ASIC

4. Open issues… (a `to do’ list:) Space qualification of components: CZT module; Opto-isolator; CPM (CsI + photo-diode) CZT procurement Establishing collimator/ CAM methodology Background modeling CsI/ PMT qualification Power/ weight

5. CZT procurement… Next 4 months : Structural analysis of a module Replicate electronics (Detector board; amplifier; FE electronics) Temperature test Procure different configuration modules (same ASIC; different detectors) Generate qualification document 5 – 8 months Proceed with qualification and choose Generate RFP 9 – 12 months Procure additional modules for lab model 13 – 18 months Procure flight modules

7. Background Reduction New “Phoswich” combination ….

8. Expected Count rates (per second; per quadrant) Diffuse Cosmic background Calibration source 10 100 Crab Nebula (5 keV threshold)200 Crab Nebula (10 keV threshold)100 Veto triggered events250 Maximum expected event rate1000

9. Design considerations Active Compton Background rejection Simple shield – minimize mass Collimator to reduce DCXRB Quadrant-wise Cooling requirements

10. Major components CZT detectors CsI(Tl) – anticoincidence Collimator/ Coded Aperture Mask Alha-tagged source Data handling system

12. Specifications… Area1024 cm 2 (+/- 20%) Pixels16384 Pixel size2.5 mm X 2.5 mm (5 mm thick) Read-outASIC based (128 chips of 128 channels) Imaging methodCoded Aperture Mask (CAM) Field of View 17 X 17 deg 2 (CAM) - > 100 keV 5 X 5 (25 – 100 keV) (20 – 40 deg 2 ) 1 X 1 (5 – 25 keV) (1 – 5 deg 2 ) Angular resolution8 arcmin (21 arcmin geometric) (5 – 40 ‘) Energy resolution3% @ 100 keV (< 5 %) Energy range5 – 100 keV (LLD: < 10; ULD: 80-120 Up to 1 MeV (Photometric) Sensitivity0.5 mCrab (5 sig; 10 4 s) (< 1 mC)

13. CZT DetectorCZT Electronics Package CodeAS-CZ-DT-01AS-CZ-EL-01 Package dimensions (excluding lugs) 490 X 490 X 700205 X 224 X 182 Mounting lug16 M6 screws6 M4 screws Mounting requirementThermal isolation None Weight (kg)70* 3 Alignment requirement+ 0.05 o None Power (W) 502.5 Overall envelope550 X 550 X 750220 X 260 X 200 FOV17 o X 17 o None HeritageNoneGXHE-10 (GSAT-2) Number of connectors 2412 Number of el. cards 289