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Ay 191 Experiment Development of Hard X-ray Imaging Detectors J. Hong and J. Grindlay

Ay 191 Experiment Development of Hard X-ray Imaging Detectors J. Hong and J. Grindlay Hard X-rays (~10-600 keV) are direct probes of black holes : GRBs, AGNs, Stellar BHs, etc.

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Ay 191 Experiment Development of Hard X-ray Imaging Detectors J. Hong and J. Grindlay

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  1. Ay 191 Experiment • Development of Hard X-ray Imaging Detectors • J. Hong and J. Grindlay • Hard X-rays (~10-600 keV) are direct probes of black holes: GRBs, AGNs, Stellar BHs, etc. • Direct imaging possible only for narrow FoV (<~0.1º) and only for low energies (<~100 keV) => coded-aperture telescope • Harvard balloon-borne telescope (ProtoEXIST) is a coded-aperture telescope for wide-field (~20ºx20º) hard X-ray imaging and is a prototype platform for development of the • scanning telescope needed for a major NASA mission, • EXIST, to conduct a very sensitive all-sky survey for BHs

  2. Coded-Aperture Hard X-ray Imaging Telescope Decoding Shadowgram allows wide-field imaging. Position-sensitive hard X-ray detectors needed: Use Cd-Zn-Te (CZT) arrays.

  3. Cd-Zn-Te (CZT) Hard X-ray imaging detector CZT Detectors 8 x 8 pixels on each 20 x 20mm CZT crystal (pixels on bottom) Schematic CZT detector: Electrons drift to anode Under ~700V bias

  4. CZT detectors: prototype lab array

  5. ProtoEXIST detector array 4cm x 8cm Detector Crystal Array (DCA)

  6. Balloon-borne ProtoEXIST Telescope Energetic X-ray Imaging Telescope Experiment (ProtoEXIST) with 1000 cm2 CZT detectors

  7. Ay191 experiments • Learn about • -Hard X-ray sources in the sky: Black holes … • -Hard X-ray Imaging: Coded-aperture telescopes • -Hard X-ray Detectors: CdZnTe detector • Experiments to be conducted (at CfA ProtoEXIST lab, B-105): • -Calibrating new CZT imager with 60, 122, 356 keV sources • -Measuring spatial and spectral resolution over detector • -Sensitivity to multi-pixel (split) events • -Cooling test (to -10°C) with CZT modules • -Design considerations for ProtoEXIST balloon-telescope

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