| Project/Area Number |
13304015
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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 |
Astronomy
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| Research Institution | National Astronomical Observatory |
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Principal Investigator |
MATSUO Hiroshi National Astronomical Observatory, Advanced Technology Center, Associate Professor, 天文機器開発実験センター, 助教授 (90192749)
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| Co-Investigator(Kenkyū-buntansha) |
EZAWA Hajime National Astronomical Observatory, Division of Radio Astronomy, Research Associate, 電波天文学研究系, 助手 (60321585)
KUNO Nario National Astronomical Observatory, Division of Radio Astronomy, Research Associate, 電波天文学研究系, 助手 (30311179)
NOGUCHI Takashi National Astronomical Observatory, Division of Radio Astronomy, Associate Professor, 電波天文学研究系, 助教授 (90237826)
HATTORI Makoto Tohoku University, Astronomy Institute, Associate Professor, 大学院・理学研究科, 助教授 (90281964)
SHIMIZU Hirohiko RIKEN, Image Information Division, Division Leader, イメージ情報技術開発室, 室長 (50249900)
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| Project Period (FY) |
2001 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥24,830,000 (Direct Cost: ¥19,100,000、Indirect Cost: ¥5,730,000)
Fiscal Year 2003: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2002: ¥19,500,000 (Direct Cost: ¥15,000,000、Indirect Cost: ¥4,500,000)
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| Keywords | Submillimeter-wave astronomy / Terahertz frequencies / Continuum observations / Direct detectors / Superconducting Niobium / Bolometers / Two dimensional array / Cryogenics / データ解析 / サブミリ波 / 天文学 / 超伝導体 / トンネル接合 / 検出器 / 極低温技術 / 電流ノイズ |
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| Research Abstract |
Development of submillimeter-wave SIS photon detector is performed using superconducting niobium junctions to realize wide-field and wide-bandwidth observations in submillimeter-wave. We have also made 3-color bolometer system operating at 350,650 and 850 GHz to start submilllimeter-wave continuum observations with ASTE (Atacama Submillimeter Telescope Experiment) submillimeter telescope.
In the first year of development, we have successfully fabricated low leakage, less than 10 pA, tunnel junction with 1kA/cm2 current density by optimizing the fabrication conditions. In the next year we have observed submillimeter-wave response at 440 GHz and 650 GHz using 4 micron and 3 micron diameter junctions, respectively. In the last year, we have evaluated the detector performance, such as leakage current, current noise, voltage responsivity, quantum efficiency, linearity, time constant and beam pattern with optics. NEP shows 10(-16)W/sqrt(Hz). The measured performance is superior to submillimeter-wave bolometers. The fabrication yield is improve to be 98% for single junctions and 78% for detector elements.
The 3-color bolometer system is developed to make early continuum observations with ASTE telescope and to evaluate the antenna performance. Cryostat for 0.3 K operations is developed to realize remotely operable low vibration cryogenics. We have started scientific observing runs with the bolometric receivers.
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