| Budget Amount *help |
¥24,440,000 (Direct Cost: ¥18,800,000、Indirect Cost: ¥5,640,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥8,060,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥1,860,000)
Fiscal Year 2014: ¥14,300,000 (Direct Cost: ¥11,000,000、Indirect Cost: ¥3,300,000)
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| Outline of Final Research Achievements |
Fifteen air Cherenkov detectors have been developed and deployed at the observation site of the Telescope Array Experiment in Utah, USA. This project aims at measuring the energy spectrum and nuclear composition of cosmic rays with energies above 10^15eV, to determine the transition energy of cosmic rays of Galactic and extra-galactic origins. A 200MHz FADC is used for the Cherenkov detectors to record waveforms of Cherenkov pulses associated with air showers produced by cosmic rays in the atmosphere. A fully-automated observation system has been installed that enables autonomous data acquisition in every dark (moon-less) nights. Due to a delay of electronics development by a vendor, the start of stable run was also delayed about 1 year. Nevertheless the observation system is remarkably stable, cosmic ray events are recorded in every 7 seconds in dark (moon-less) nights, and data analysis is ongoing.
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