| Project/Area Number |
08554002
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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 | 展開研究 |
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| Research Field |
Astronomy
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| Research Institution | RIKEN (The Institute of Physical and Chemical Research) |
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Principal Investigator |
SHIMIZU Hirohiko RIKEN, Advanced Computing Center, Researcher, 情報基盤研究部・イメージ情報技術開発室, 研究員 (50249900)
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| Co-Investigator(Kenkyū-buntansha) |
OKU Takayuki RIKEN, Advanced Computing Center, Postdoctoral Researcher, 情報基盤研究部・イメージ情報技術開発室, 基礎科学特別研究員 (10301748)
OTANI Chiko RIKEN, Advanced Computing Center, Contract Researcher, 研究基盤ツール開発推進グループ, 研究協力員(研究員) (50281663)
SATO Hiromi RIKEN, Advanced Computing Center, Postdoctoral Researcher, 情報基盤研究部・イメージ情報技術開発室, 基礎科学特別研究員 (20300874)
KAWAI Kazuhiko RIKEN, Advanced Computing Center, Contract Researcher, 研究基盤ツール開発推進グループ, 研究協力員(研究員) (00312265)
IKEDA Tokihiro RIKEN, Advanced Computing Center, Postdoctoral Researcher, 情報基盤研究部・イメージ情報技術開発室, 基礎科学特別研究員 (80301745)
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| Project Period (FY) |
1996 – 1998
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| Keywords | Superconduting Tunnel Junction / X-ray Detector / Cryogenic Detector |
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| Research Abstract |
The superconduting tunnel junction is a low temperature detector which can be operated at relatively higher temperatures below IK. It is a candidate of general purpose radiation detector of the next generation. In this project, the fabrication technique of the superconduting tunnel junctions with a good quality and reproducibility is studied together with the development of readout circuits which transmit electric signals from the junctions located at low temperatures to data acquisition system at room temperature.
The superconduting tunnel junctions for X-ray detection have been developed using a special processing line of RIKEN. The layer structure of the junctions was a pentalayer of Nb/Al/AlOx/Al/Nb deposited on an aluminum-oxide buffer layer on silicon and sapphire substrates. The leak current across the tunnel barrier was suppressed by improving the technique to oxidize the side of the junction under oxygen plasma. Consequently, the leak current was successfully suppressed more than one order of magnitude with a good reproducibility. The response of the junction to 5.9 keV X-rays was measured for various dimensions of junctions of 20μm×20μm, 100μm×100μm, 200μm×200μm, 500μm×500μm. X-ray signals were observed in all cases and the best energy resolution reached 41 eV. The readout electronics was also improved using semiconductor electronics and superconducting electronics. The techniques to realize superconducting X-ray detection system were studied and developed in this project.
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