| Project/Area Number |
14540267
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | Osaka University |
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Principal Investigator |
SAKEMI Yasuhiro Osaka University, Research Center for Nuclear Physics, Associate Professor, 核物理研究センター, 助教授 (90251602)
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| Co-Investigator(Kenkyū-buntansha) |
WAKASA Tomotsugu Kyushu University, Department of Physics, Associate Professor, 大学院・理学研究院物理学部門, 助教授 (10311771)
HATANAKA Kichiji Osaka University, Research Center for Nuclear Physics, Professor, 核物理研究センター, 教授 (50144530)
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2003: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2002: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | Gas Electron Multiplier / Position Detector / GEM / Coherent Pion Production / 荷電粒子検出器 |
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| Research Abstract |
The detector system was developed to study the coherent pion production, which will be sensitive to the short range component of the nuclear force. In this reaction, the virtual pion emitted from proton beam with kinetic energy 400 MeV will become real pion by scattered from nucleon through the propagation of nuclear medium. The construction of the prototype of detector system was completed, and the test experiment is scheduled in 2004.
(1) Development of Gas Electron Multiplier (GEM) Detector
The gas electron multiplier detector consists of cathode electrode, GEM electrodes, and readout board. The GEM electrode has very small holes, and the high voltage is applied on both sides of electrode. The rapid change of electric field near the hole causes the electron amplification. The produced electrons are collected into the strips fabricated on the readout board.
We measured the gain dependence on the gas type and mixture, and found that we got a high gain with Ar + C4H1O, compared with Ar + C02.
(2) Development of High Speed Readout Electronics
The readout card consists of the pre-amplifier, buffering, and multiplexer. The signals from many channels are amplified, and stored in the buffer. The buffered analogue signal is transferred to ADC module through the multiplexer with the speed of 10 MHz. The gain and shaping time can be adjusted by setting the value in the register of the readout card. We developed the electronics with Field Programmable G ate Array to load the data into the register to set the readout card.
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