title   
  

A 3D CZT high resolution detector for x- and gamma-ray astronomy

Kuvvetli, İrfan and Budtz-Jorgensen, Carl and Zappettini, Andrea and Zambelli, Nicola and Benassi, Giacomo and Kalemci, Emrah and Caroli, Ezio and Stephen, J. and Auricchio, N. (2014) A 3D CZT high resolution detector for x- and gamma-ray astronomy. In: SPIE High Energy, Optical, and Infrared Detectors for Astronomy VI, Montreal, Canada

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Official URL: http://dx.doi.org/10.1117/12.2055119

Abstract

At DTU Space we have developed a high resolution three dimensional (3D) position sensitive CZT detector for high energy astronomy. The design of the 3D CZT detector is based on the CZT Drift Strip detector principle. The position determination perpendicular to the anode strips is performed using a novel interpolating technique based on the drift strip signals. The position determination in the detector depth direction, is made using the DOI technique based the detector cathode and anode signals. The position determination along the anode strips is made with the help of 10 cathode strips orthogonal to the anode strips. The position resolutions are at low energies dominated by the electronic noise and improve therefore with increased signal to noise ratio as the energy increases. The achievable position resolution at higher energies will however be dominated by the extended spatial distribution of the photon produced ionization charge. The main sources of noise contribution of the drift signals are the leakage current between the strips and the strip capacitance. For the leakage current, we used a metallization process that reduces the leakage current by means of a high resistive thin layer between the drift strip electrodes and CZT detector material. This method was applied to all the proto type detectors and was a very effective method to reduce the surface leakage current between the strips. The proto type detector was recently investigated at the European Synchrotron Radiation Facility, Grenoble which provided a fine 50 × 50 μm2 collimated X-ray beam covering an energy band up to 600 keV. The Beam positions are resolved very well with a ~ 0.2 mm position resolution (FWHM ) at 400 keV in all directions.

Item Type:Papers in Conference Proceedings
Uncontrolled Keywords:Gamma-ray astronomy ; Sensors ; Signal to noise ratio ; Synchrotron radiation ; X-rays ; Ionization ; Photons ; Astronomy ; Capacitance ; Electrodes
Subjects:Q Science > QC Physics > QC770 Nuclear and particle physics. Atomic energy. Radioactivity
ID Code:25081
Deposited By:Emrah Kalemci
Deposited On:20 Dec 2014 11:22
Last Modified:20 Dec 2014 11:22

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