1 / 6

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

Ay 191 Experiment Development of Hard X-ray Imaging Detectors J. Hong, B. Allen and J. Grindlay. Hard X-rays (~5-600 keV) are direct probes of black holes : GRBs, AGNs, Stellar BHs, etc.

kura
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Ay 191 Experiment Development of Hard X-ray Imaging Detectors J. Hong, B. Allen and J. Grindlay • Hard X-rays (~5-600 keV) are direct probes of black holes: GRBs, AGNs, Stellar BHs, etc. • Direct imaging using mirrors is possible only for narrow FoV (<~1º) and low energies (<~100 keV) => coded-aperture telescope • Harvard balloon-borne telescope (ProtoEXIST) is a coded-aperture telescope for wide-field (~10ºx10º) hard X-ray imaging. • ProtoEXIST is a prototype platform for development of EXIST (Energetic X-ray Imaging Survey Telescope), to probe the early Universe using high redshift GRBs and survey BHs on all scale.

  2. Coded-Aperture Hard X-ray Imaging Telescope Decoding Shadowgram allows for wide-field imaging in hard X-ray band. 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 ~600V bias

  4. ProtoEXIST1 Detector Module (2.5mm pixel)

  5. ProtoEXIST • Demonstrate the technology for large array CZT detectors with small pixels covering 5 – 600 keV • ProtoEXIST1 = 512 cm2 (2.5 mm pixel) • ProtoEXIST2 & 3 = 512 cm2 (0.6 mm pixel) • EXIST ~ 4.5 m2 (0.6 mm pixel) • Identify the optimal shielding configuration • Demonstrate continuous scanning coded-aperture imaging technique

  6. 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 ~0 – 5°C) with CZT modules

More Related