A prototype Si/CdTe Compton camera and the polarization measurement

Mitani, Takefumi; Tanaka, Takaaki; Nakazawa, K.; Takahashi, Tadayuki; Takashima, Takeshi; Tajima, H.; Nakamura, Hidehito; Nomachi, M.; Nakamoto, Tomoko; Fukazawa, Yasushi

doi:10.1109/tns.2004.835653

Cited by 40 publications

(39 citation statements)

References 28 publications

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“…16 (b) shows the corresponding distribution simulated by the EGS4 MC simulation. A fit on the experimental measurement yields the modulation factor of 43 ± 3% which is in a good agreement with the EGS4 result of 41 ± 2% [28]. These results validate our implementation of the EGS4 simulation at 10% level.…”

Section: B Compton Reconstructionsupporting

confidence: 84%

“…Fig. 10 shows the 241 Am energy spectrum at a bias voltage of 600 V. We obtain an energy resolution of 1.7 keV (FWHM) [26], [28].…”

Section: Kev (Fwhm) Atmentioning

confidence: 99%

“…In order to evaluate the polarization performance of the prototype Compton telescope, we have carried out a beam test at SPring-8 photon factory in Japan [28]. Fig.…”

Section: B Compton Reconstructionmentioning

confidence: 99%

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Design and performance of the soft gamma-ray detector for the NeXT mission

Tajima

Kamae

Madejski

et al. 2005

IEEE Trans. Nucl. Sci.

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The Soft Gamma-ray Detector (SGD) on board the NeXT (Japanese future high energy astrophysics mission) is a Compton telescope with narrow field of view (FOV), which utilizes Compton kinematics to enhance its background rejection capabilities. It is realized as a hybrid semiconductor gamma-ray detector which consists of silicon and CdTe (cadmium telluride) detectors. It can detect photons in a wide energy band (0.05-1 MeV) at a background level of 5 × 10 −7 counts/s/cm 2 /keV; the silicon layers are required to improve the performance at a lower energy band (<0.3 MeV). Excellent energy resolution is the key feature of the SGD, allowing it to achieve both high angular resolution and good background rejection capability. An additional capability of the SGD, its ability to measure gamma-ray polarization, opens up a new window to study properties of astronomical objects. We will present the development of key technologies to realize the SGD: high quality CdTe, low noise front-end ASIC and bump bonding technology. Energy resolutions of 1.7 keV (FWHM) for CdTe pixel detectors and 1.1 keV for Si strip detectors have been measured. We also present the validation of Monte Carlo simulation used to evaluate the performance of the SGD.

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Section: B Compton Reconstructionsupporting

confidence: 84%

“…Fig. 10 shows the 241 Am energy spectrum at a bias voltage of 600 V. We obtain an energy resolution of 1.7 keV (FWHM) [26], [28].…”

Section: Kev (Fwhm) Atmentioning

confidence: 99%

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Design and performance of the soft gamma-ray detector for the NeXT mission

Tajima

Kamae

Madejski

et al. 2005

IEEE Trans. Nucl. Sci.

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“…Based on the idea proposed from our group [6,7], we are developing a new Compton telescope utilizing Si and CdTe detectors with high position and energy resolutions [8][9][10]. Fig.…”

Section: Introductionmentioning

confidence: 99%

Recent results from a Si/CdTe semiconductor Compton telescope

Tanaka

Watanabe

Takeda

et al. 2006

Nuclear Instruments and Methods in Physics Research Section A:

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We are developing a Compton telescope based on high resolution Si and CdTe detectors for astrophysical observations in sub-MeV/MeV gamma-ray region. Recently, we constructed a prototype Compton telescope which consists of six layers of double-sided Si strip detectors and CdTe pixel detectors to demonstrate the basic performance of this new technology. By irradiating the detector with gamma-rays from radio isotope sources, we have succeeded in Compton reconstruction of images and spectra. The obtained angular resolution is 3.9 • (FWHM) at 511 keV, and the energy resolution is 14 keV (FWHM) at the same energy. In addition to the conventional Compton reconstruction, i.e., drawing cones in the sky, we also demonstrated a full reconstruction by tracking Compton recoil electrons using the signals detected in successive Si layers. By irradiating 137 Cs source, we successfully obtained an image and a spectrum of 662 keV line emission with this method. As a next step, development of larger double-sided Si strip detectors with a size of 4 cm × 4 cm is underway to improve the effective area of the Compton telescope. We are also developing a new low-noise analog ASIC to handle the increasing number of channels. Initial results from these two new technologies are presented in this paper as well.

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“…Noise is measured to be 1.5 keV (FWHM). Figure 5 (c) shows the 241 Am energy spectrum at a bias voltage of 600 V. We obtain an energy resolution of 1.7 keV (FWHM) at 60 keV [9,11].…”

Section: Energy Resolutionmentioning

confidence: 94%

Design and performance of soft gamma-ray detector for NeXT mission

Tajima

Kamae

Madejski

et al.

IEEE Symposium Conference Record Nuclear Science 2004.

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The Soft Gamma-ray Detector (SGD) on board NeXT (Japanese future high energy astrophysics mission) is a Compton telescope with narrow field of view, which utilizes Compton kinematics to enhance its background rejection capabilities. It is realized as a hybrid semiconductor gamma-ray detector which consists of silicon and Cadmium Telluride (CdTe) detectors. It can detect photons in an energy band 0.05-1 MeV at a background level of 5×10 −7 counts/s/cm 2 /keV; the silicon layers are required to improve the performance at a lower energy band (<0.3 MeV). Excellent energy resolution is the key feature of the SGD to achieve both high angular resolution and good background rejection capability. Its ability to measure gamma-ray polarization opens up a new window to study gamma-ray emission in the universe. We will present the development of key technologies to realize the SGD; high quality CdTe, low noise front-end VLSI and bump bonding technology. Energy resolutions of 1.7 keV (FWHM) for CdTe pixel detectors and 1.1 keV for silicon strip detectors have been measured. We also present the validation of Monte Carlo simulation used to evaluate the performance of the SGD.

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A prototype Si/CdTe Compton camera and the polarization measurement

Cited by 40 publications

References 28 publications

Design and performance of the soft gamma-ray detector for the NeXT mission

Design and performance of the soft gamma-ray detector for the NeXT mission

Recent results from a Si/CdTe semiconductor Compton telescope

Design and performance of soft gamma-ray detector for NeXT mission

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