Heuristic Observation with All-sky High Resolution Air-shower detector
Grant-in-Aid for Scientific Research (B)
|Allocation Type||Single-year Grants|
|Research Institution||The University of Tokyo|
SASAKI Makoto The University of Tokyo, Institute for Cosmic Ray Research, Associate Professor (40242094)
ASAOKA Yoichi University of Tokyo, Institute for Cosmic Ray Research, Research Assistant (40345054)
WATANABE Yasushi Tokyo Institute of Technology, Department of Physics, Professor (40126199)
SUGIYAMA Naoshi National Astronomical Observatory of Japan, Division of Theoretical Astronomy, Professor (70222057)
KUZE Hiroaki Chiba University, Center for Environmental Remote Sensing, Professor (00169997)
OGAWA Satoru Toho University, Faculty of Science, Associate Professor (10256761)
林野 友紀 東北大学, ニュートリノ科学研究センター, 助教授 (10167596)
|Project Period (FY)
2004 – 2005
Completed(Fiscal Year 2005)
|Budget Amount *help
¥11,900,000 (Direct Cost : ¥11,900,000)
Fiscal Year 2005 : ¥6,100,000 (Direct Cost : ¥6,100,000)
Fiscal Year 2004 : ¥5,800,000 (Direct Cost : ¥5,800,000)
|Keywords||astrophysics / gamma ray burst / wide field of view telescope / transient object / photoelectric image / 広視野望遠鏡 / 突発的天体 / カンマ線バースト / 光学閃光 / 広角高精度望遠鏡 / Ashra / ハレアカラ / HETE / SWIFT|
Ashra (All-sky Survey High Resolution Air-shower detector) is a project to build an unconventional optical telescope complex that images very wide field of view, covering 80% of the sky, yet with the angle resolution of a few arcmin, sensitive to the blue to UV light with the use of image intensifier and CMOS technology. The project primarily aims to observe Cherenkov and fluorescence lights from the lateral and longitudinal developments of very-high energy cosmic rays in the atmosphere. It can also be used to monitor optical transients in the wide field of sky.
After approval of the land usage at the Mauna Loa site in July 2005, we immediately occupied the site and began development. After finishing the grading work for the area of 2,419m^2 at the Mauna Loa site at the end of July 2005, installation of electrical power lines and transformers was performed until the beginning of September. We started the construction of the detector in October 2005 after receiving materials from Japan.
Currently, (mid December 2005) a few shelters having motorized rolling doors, acrylic plate windows to maintain air-tightness, and heat-insulating walls and floors have been constructed and positioned on eight construction piers of concrete blocks at the Mauna Loa site. In the shelters, the optical elements of the light collectors have been already installed. The optical performance were checked and adjusted to be optimum with star light images from the pilot observation.
In December 2005, we evaluated the night sky background flux on Mauna Loa using the Ashra light collector installed and aligned in a shelter to be consistent with the background in La Palma and Namibia by the HESS group. From the star light observations, our understanding of the light correction efficiency to be accurate within 5% level.
The civil engineering construction of light collectors, in shelters at the Mauna Loa site has been completed. We are performing device installation and specific observation in a step-by-step way to enhance the scientific impacts. Less
Research Products (21results)