TY - JOUR
T1 - Performance of the gamma-ray camera based on GSO(Ce) scintillator array and PSPMT with the ASIC readout system
AU - Ueno, Kazuki
AU - Hattori, Kaori
AU - Ida, Chihiro
AU - Iwaki, Satoru
AU - Kabuki, Shigeto
AU - Kubo, Hidetoshi
AU - Kurosawa, Shunsuke
AU - Miuchi, Kentaro
AU - Nagayoshi, Tsutomu
AU - Nishimura, Hironobu
AU - Orito, Reiko
AU - Takada, Atsushi
AU - Tanimori, Toru
N1 - Funding Information:
This work is supported by a Grant-in-Aid in Scientific Research of the Japan Ministry of Education, Culture, Science, Sports, Technology; “SENTAN”, JST; a Grant-in-Aid for the 21st Century COE “Center for Diversity and Universality in Physics”; and JSPS Research Fellowships for Young Scientists (K.U., K.H., T.N., H.N., R.O.).
PY - 2008/6/11
Y1 - 2008/6/11
N2 - We have studied the performance of a readout system with ASIC chips for a gamma-ray camera based on a 64-channel multi-anode PSPMT (Hamamatsu flat-panel H8500) coupled to a GSO(Ce) scintillator array. The GSO array consists of 8×8 pixels of 6×6×13 mm3 with the same pixel pitch as the anode of the H8500. This camera is intended to serve as an absorber of an electron tracking Compton gamma-ray camera that measures gamma rays up to ∼1 MeV. Because we need a readout system with low power consumption for a balloon-borne experiment, we adopted a 32-channel ASIC chip, IDEAS VA32_HDR11, which has one of the widest dynamic range among commercial chips. However, in the case of using a GSO(Ce) crystal and the H8500, the dynamic range of VA32_HDR11 is narrow, and therefore the H8500 has to be operated with a low gain of about 105. If the H8500 is operated with a low gain, the camera has a narrow incident-energy dynamic range from 100 to 700 keV, and a bad energy resolution of 13.0% (FWHM) at 662 keV. We have therefore developed an attenuator board in order to operate the H8500 with the typical gain of 106, which can measure up to ∼1 MeV gamma ray. The board makes the variation of the anode gain uniform and widens the dynamic range of the H8500. The system using the new attenuator board has a good uniformity of min:max∼1:1.6, an incident-energy dynamic range from 30 to 900 keV, a position resolution of less than 6 mm, and a typical energy resolution of 10.6% (FWHM) at 662 keV with a low power consumption of about 1.7 W/64ch. Crown
AB - We have studied the performance of a readout system with ASIC chips for a gamma-ray camera based on a 64-channel multi-anode PSPMT (Hamamatsu flat-panel H8500) coupled to a GSO(Ce) scintillator array. The GSO array consists of 8×8 pixels of 6×6×13 mm3 with the same pixel pitch as the anode of the H8500. This camera is intended to serve as an absorber of an electron tracking Compton gamma-ray camera that measures gamma rays up to ∼1 MeV. Because we need a readout system with low power consumption for a balloon-borne experiment, we adopted a 32-channel ASIC chip, IDEAS VA32_HDR11, which has one of the widest dynamic range among commercial chips. However, in the case of using a GSO(Ce) crystal and the H8500, the dynamic range of VA32_HDR11 is narrow, and therefore the H8500 has to be operated with a low gain of about 105. If the H8500 is operated with a low gain, the camera has a narrow incident-energy dynamic range from 100 to 700 keV, and a bad energy resolution of 13.0% (FWHM) at 662 keV. We have therefore developed an attenuator board in order to operate the H8500 with the typical gain of 106, which can measure up to ∼1 MeV gamma ray. The board makes the variation of the anode gain uniform and widens the dynamic range of the H8500. The system using the new attenuator board has a good uniformity of min:max∼1:1.6, an incident-energy dynamic range from 30 to 900 keV, a position resolution of less than 6 mm, and a typical energy resolution of 10.6% (FWHM) at 662 keV with a low power consumption of about 1.7 W/64ch. Crown
KW - ASIC
KW - Gamma-ray camera
KW - PSPMT
KW - Scintillator
UR - http://www.scopus.com/inward/record.url?scp=44649101305&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=44649101305&partnerID=8YFLogxK
U2 - 10.1016/j.nima.2008.03.071
DO - 10.1016/j.nima.2008.03.071
M3 - Article
AN - SCOPUS:44649101305
VL - 591
SP - 268
EP - 271
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
SN - 0168-9002
IS - 1
ER -