| Project/Area Number |
18204020
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SAGAWA Hiroyuki The University of Tokyo, Institute for Cosmic Ray Research, Associate Professor (80178590)
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| Co-Investigator(Kenkyū-buntansha) |
FUKUSHIMA Masaki University of Tokyo, Institute for Cosmic Ray Research, Professor (30241227)
SAKURAI Nobuyuki University of Tokyo, Institute for Cosmic Ray Research, Research Assistant (20420234)
HAYASHIDA Naoaki University of Tokyo, Institute for Cosmic Ray Research, Assistant Professor (50114616)
FUKUDA Shigeki High Energy Accelerator Research Organization, Accelerator Laboratory, Professor (80132687)
FURUKAWA Kazuo High Energy Accelerator Research Organization, Accelerator Laboratory, Associate Professor (00190132)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥45,630,000 (Direct Cost: ¥35,100,000、Indirect Cost: ¥10,530,000)
Fiscal Year 2007: ¥15,730,000 (Direct Cost: ¥12,100,000、Indirect Cost: ¥3,630,000)
Fiscal Year 2006: ¥29,900,000 (Direct Cost: ¥23,000,000、Indirect Cost: ¥6,900,000)
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| Keywords | cosmic ray / accelerator |
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| Research Abstract |
The Telescope Array, located in the desert of Utah in USA, observes extensive air showers that extremely high energy cosmic rays generate in air by using air fluorescence telescopes (FD). We proposed a very unique method of end-to-end absolute calibration of telescopes by observing air shower induced by electron beams from a compact electron linear accelerator (TA-LINAC) shot in the air. It has the performance of maximum electron energy of 40 MeV and output power of 6.4 mW. We aimed at measuring the energy of40 MeV within 1% accuracy and the beam current of 160pC/pulse of 1μsec width within 5% accuracy. Tatsunobu Shibata (Researcher) and Daisuke Ikeda (Graduate student) cooperatec with us for this research.
We designed TA-LINAC by using beam simulation, and investiaged the method of absolute calibration by using TA-LINAC. We constructed TA-LINAC in High Energy Accelerator Research Organization. It was completed in January, 2008, and we succeeded in accelerating beams. We measured the values of magnetic field of a 90-degree bending electromagnet that determines beam energy. within 1% accuracy. We measured the stability of magnetic field that affects the stability of beam energy. Thus we could measure electron energy of 39.75 MeV approximately within 0.01% accuracy.
We measured beam current with an accuracy of 3% by a Faraday cup. During beam operation, we use a core monitor to monitor beam current. We confirmed linear relation between the Faraday cup and the core monitor within an accuracy of 5%. After confirming the performance, we sent TA-LINAC to USA. The construction of the concrete base and the fence of radiation control was performed at the site of TA-LINAC near one of the FD station.
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