Dr. Akihira Miyachi Profile

Dr. Akihira Miyachi

at National Astronomical Observatory

SPIE Involvement:

Author

Publications (6)

Proceedings Article | 16 August 2024 Presentation + Paper

ALMA Band 8 version2 receiver upgrade project

Takafumi Kojima, Tetsuhiro Minamidani, Ryo Sakai, Hiroaki Imada, Keiko Kaneko, Sho Masui, Kazunori Uemizu, Kazumasa Makise, Akihira Miyachi, Shohei Ezaki, Tomonori Tamura, Shun Ishii, Bunyo Hatsukade

Proceedings Volume 13102, 131020K (2024) https://doi.org/10.1117/12.3021139

KEYWORDS: Receivers, Design, Mirrors, Reflection, Waveguides, Double sideband modulation, Diagnostics, Radio frequency circuits, Polarization, Transformers

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Proceedings Article | 16 August 2024 Presentation + Paper

Development of an SIS mixer-based amplifier for large-scale multipixel heterodyne receivers

Yoshinori Uzawa, Akira Kawakami, Takafumi Kojima, Kazumasa Makise, Sho Masui, Yosuke Murayama, Akihira Miyachi, Wenlei Shan

Proceedings Volume 13102, 131020L (2024) https://doi.org/10.1117/12.3020000

KEYWORDS: Oscillators, Superconductors, Heterodyning, Quantum noise, Amplifiers

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Proceedings Article | 13 December 2020 Presentation + Paper

Wideband technology development to increase the RF and instantaneous bandwidth of ALMA receivers

Takafumi Kojima, Kazunori Uemizu, Hitoshi Kiuchi, Tomonori Tamura, Keiko Kaneko, Ryo Sakai, Akihira Miyachi, Wenlei Shan, Yoshinori Uzawa, Alvaro Gonzalez, Matthias Kroug, Takeshi Sakai

Proceedings Volume 11453, 114530P (2020) https://doi.org/10.1117/12.2561240

KEYWORDS: Receivers, Radio frequency circuits, Astronomy, Observatories, Heterodyning, Waveguides

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Proceedings Article | 13 December 2020 Presentation + Paper

An SIS-mixer-based amplifier for multi-pixel heterodyne receivers

Yoshinori Uzawa, Takafumi Kojima, Yuto Kozuki, Yasunori Fujii, Akihira Miyachi, Tomonori Tamura, Shohei Ezaki, Wenlei Shan

Proceedings Volume 11453, 114530Q (2020) https://doi.org/10.1117/12.2563183

KEYWORDS: Amplifiers, Heterodyning, Receivers, Microwave radiation, Cryogenics, Frequency conversion

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Proceedings Article | 19 July 2016 Paper

Design of corrugated-horn-coupled MKID focal plane for CMB B-mode polarization

Yutaro Sekimoto, Shigeyuki Sekiguchi, Shibo Shu, Masakazu Sekine, Tom Nitta, Masato Naruse, Agnes Dominjon, Takashi Hasebe, Wenlei Shan, Takashi Noguchi, Akihira Miyachi, Makoto Mita, Shigeo Kawasaki

Proceedings Volume 9914, 99142A (2016) https://doi.org/10.1117/12.2231074

KEYWORDS: Polarization, Staring arrays, Sensors, Waveguides, Microwave radiation, Polarization, Aluminum, Beam shaping, Silicon, Prototyping, Astronomy

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Proceedings Article | 23 July 2014 Paper

ALMA band 10 (787-950 GHz): summary of the production of 73 receivers and first light results

Alvaro Gonzalez, Yasunori Fujii, Keiko Kaneko, Matthias Kroug, Takafumi Kojima, Koichi Kuroiwa, Akihira Miyachi, Kazumasa Makise, Zhen Wang, Shin'ichiro Asayama, Yoshinori Uzawa

Proceedings Volume 9153, 91530N (2014) https://doi.org/10.1117/12.2055598

KEYWORDS: Receivers, Polarization, Tolerancing, Astronomy, Antennas, Mirrors, Optical testing, Terahertz radiation, Superconductors, Niobium

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Showing 5 of 6 publications

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