| Project/Area Number |
14540246
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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 | The University of Tokyo |
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Principal Investigator |
OHNISHI Munehiro The University of Tokyo, Institute for Cosmic Ray Research, Research Associate, 宇宙線研究所, 助手 (10260514)
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| Co-Investigator(Kenkyū-buntansha) |
TAKITA Masato The University of Tokyo, Institute for Cosmic Ray Research, Associate Professor, 宇宙線研究所, 助教授 (20202161)
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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: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2002: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | Cosmic ray / Gamma ray / Air shower / FASTBUS / VME / TKO |
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| Research Abstract |
Air shower array which can always observe cosmic rays with wide view has succeeded in observing gamma rays from celestial sources in TeV region, for example, the Tibet Air Shower Array. A high-density air shower array that can observe cosmic rays in sub TeV region is the next important step. However, it has not been put to practical use yet. The amount of data increases and trigger rate becomes high, as for next generation air shower array. This research is to develop the high-speed data acquisition system for the next generation air shower array.
In 2002, development and the production of charge to time conversion module (DCT) with TKO standard were done for speed-up of data acquisition. In addition, the key subroutines for the data taking from FASTBUS to PC via VME was developed with a new conception that did decentralization and parallel data processing.
In 2003, the DCT was improved to achieve making to a low noise further. Moreover, the key subroutines for the data taking system also improved to stable operation and to decrease dead time. These modules and subroutine ware built into the Tibet Air Shower Array. The dead time of Tibet Air Shower Array became to 10% at 1700 Hz trigger rate using these production and the stable operation is being done now. The data acquisition system for the next generation high-density air shower array with high trigger rate became possible by this research.
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