TY - GEN
T1 - Development of an electron-tracking Compton camera based on a gaseous TPC and a scintillation camera for a balloon-borne experiment
AU - Ueno, Kazuki
AU - Tanimori, Toru
AU - Kubo, Hidetoshi
AU - Miuchi, Kentaro
AU - Kabuki, Shigeto
AU - Takada, Atsushi
AU - Nishimura, Hironobu
AU - Hattori, Kaori
AU - Kurosawa, Shunsuke
AU - Ida, Chihiro
AU - Iwaki, Satoru
PY - 2008
Y1 - 2008
N2 - We have developed an Electron-Tracking Compton Camera (ETCC) based on a gaseous micro Time Projection Chamber (ETCC) based on a gaseous micro Time Projection Chamber (μ-TPC) which measures the direction and the energy of the recoil electron and a GSO(Ce) scintillation camera which surrounds the μ-TPC and measures the Compton scattered gamma ray. If not measuring a direction of a recoil electron, a direction of the incident gamma-ray could only be reconstructed as a circle. Measuring the direction of the recoil electron reduces the Compton cone to a point, and thus reconstructs the incident direction completely for a single photon and realizes the strong background rejection. Using the ETCC with a detection volume of about 10cm× 10cm×15cm, we had the balloon-borne experiment supported by ISAS/JAXA in 2006 for the purpose of the observation of diffuse cosmic and atmospheric gamma rays. The ETCC obtained about 200 photons with FOV of 3 str in 3 hours in the energy range from 100 keV to 1 MeV, and the obtained flux was consistent with previous observations. On the basis of the results, we are developing the large size ETCC in order to improve the effective area for the next balloon experiment. The large size ETCC has the detection volume of 23cm ×28cm×30cm which consists of the 23cm×28cm×30cm μ-TPC and the 30cm×30cm×1.3cm scintillation camera. Then we obtained the gamma-ray image and investigated the first performances of the large size ETCC. The Angular Resolution Measure (ARM) and the Scatter Plane Deviation (SPD) are 12.1 degree and 117 degree (FWHM) at 662keV, respectively, and the energy resolution is 16.9%(FWHM) at 662keV.
AB - We have developed an Electron-Tracking Compton Camera (ETCC) based on a gaseous micro Time Projection Chamber (ETCC) based on a gaseous micro Time Projection Chamber (μ-TPC) which measures the direction and the energy of the recoil electron and a GSO(Ce) scintillation camera which surrounds the μ-TPC and measures the Compton scattered gamma ray. If not measuring a direction of a recoil electron, a direction of the incident gamma-ray could only be reconstructed as a circle. Measuring the direction of the recoil electron reduces the Compton cone to a point, and thus reconstructs the incident direction completely for a single photon and realizes the strong background rejection. Using the ETCC with a detection volume of about 10cm× 10cm×15cm, we had the balloon-borne experiment supported by ISAS/JAXA in 2006 for the purpose of the observation of diffuse cosmic and atmospheric gamma rays. The ETCC obtained about 200 photons with FOV of 3 str in 3 hours in the energy range from 100 keV to 1 MeV, and the obtained flux was consistent with previous observations. On the basis of the results, we are developing the large size ETCC in order to improve the effective area for the next balloon experiment. The large size ETCC has the detection volume of 23cm ×28cm×30cm which consists of the 23cm×28cm×30cm μ-TPC and the 30cm×30cm×1.3cm scintillation camera. Then we obtained the gamma-ray image and investigated the first performances of the large size ETCC. The Angular Resolution Measure (ARM) and the Scatter Plane Deviation (SPD) are 12.1 degree and 117 degree (FWHM) at 662keV, respectively, and the energy resolution is 16.9%(FWHM) at 662keV.
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U2 - 10.1117/12.789258
DO - 10.1117/12.789258
M3 - Conference contribution
AN - SCOPUS:70249090078
SN - 9780819472212
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Space Telescopes and Instrumentation 2008
PB - SPIE
T2 - Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray
Y2 - 23 June 2008 through 28 June 2008
ER -