1997 Fiscal Year Final Research Report Summary
Observation of the GeV gamma-rays by a balloon-borne instrument
| Project/Area Number |
08454070
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
素粒子・核・宇宙線
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| Research Institution | KANAGAWA UNIVERSITY |
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Principal Investigator |
TORII Shoji Kanagawa Univ.Physics Associate Professor, 工学部, 助教授 (90167536)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAGAMI Takamasa ISAS System Eng.Associate Professor, 助教授 (40013718)
KASAHARA Katsuaki Shibaura Inst.System Eng.Professor, システム工学部, 教授 (00013425)
YOSHIDA Kenji Kanagawa Univ.Industrial Eng.Research Associate, 工学部, 助手 (90260984)
TAMURA Tadahisa Kanagawa Univ.Physics Research Associate, 工学部, 助手 (90271361)
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| Project Period (FY) |
1996 – 1997
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| Keywords | GAMMA-RAY / COSMIC RAY / HIGH ENERGY / SCINTILLATING FIBER / BALLOON / MULTI-ANODE PMT |
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| Research Abstract |
We have been develping a new-type gamma-ray telescope to be lauched by balloon for future satellite experiment. The telescope is composed of a tracking system to detect pair-creation by gamma-ray and a calorimeter to measure the energy. Scintillating fibers are adopoted to detect the chareged particles induced by gamma-ray, and a compact-type 16-anodes PMT is to read the signals from each fiber. The calorimeter consists of segmented Csl crystals with a thickness of 8 radiation length. It is prdicted by simulations that the telescope has advantages to conventional one which detect the pair creation wiht a spark chamber. The telscope is expected to be superior to the current telescope, EGRET on CGRO,on the performance of detection efficiency, compactness and readiness. It is supposed to be possible to develop a telescope with a larger effective-area by ten times within nearly same weight to EGRET.
Peformance of each part of the detector has been optimaized by simulations and tested by using accelerator beams. It was confirmed by the electron beam test at the ES of Institute of Nuclear Study that the calorimeter has an expected performance in the energy and positional resolution. A unit of the tracking system consisting of 16 scintillating fibers (2mm square cross-section for each) and the 16-anodes PMT was irradiated to the proton beams at the CERN-PS.It could detect a minimum ionizind particle with an efficiency of nearly 100 % and a positional resolution of 0.6 mm. Since the system can have function of fast trigger, it is expected to work as an efficient anti-conincidence system against the hadron backgrounds by detcting a hit pattern which is charcteresitic to the pair creation.
We will carry out the balloon observation within two years after developing the ADC system for multi-channel read-out and constructing the balloon payload support.
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