Application of CdTe for the NeXT Mission
- SLAC
Cadmium telluride (CdTe) and cadmium zinc telluride (CdZnTe) have been regarded as promising semiconductor materials for hard X-ray and {gamma}-ray detection. The high atomic number of the materials (Z{sub Cd} = 48, Z{sub Te} = 52) gives a high quantum efficiency in comparison with Si. The large band-gap energy (Eg = 1.5 eV) allows to operate the detector at room temperature. Based on recent achievements in high-resolution CdTe detectors, in the technology of ASICs and in bump-bonding, we have proposed the novel hard X-ray and {gamma}-ray detectors for the NeXT mission in Japan. The high-energy response of the super mirror onboard NeXT will enable us to perform the first sensitive imaging observations up to 80 keV. The focal plane detector, which combines a fully depleted X-ray CCD and a pixellated CdTe detector, will provide spectra and images in the wide energy range from 0.5 keV to 80 keV. In the soft gamma-ray band up to {approx} 1 MeV, a narrow field-of-view Compton {gamma}-ray telescope utilizing several tens of layers of thin Si or CdTe detector will provide precise spectra with much higher sensitivity than present instruments. The continuum sensitivity will reach several x 10{sup -8} photons/s/keV/cm{sup 2} in the hard X-ray region and a few x 10{sup -7} photons/s/keV/cm{sup 2} in the soft {gamma}-ray region.
- Research Organization:
- Stanford Linear Accelerator Center (SLAC), Menlo Park, CA
- Sponsoring Organization:
- SC
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 839895
- Report Number(s):
- SLAC-PUB-11147
- Country of Publication:
- United States
- Language:
- English
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