Dr. Yoshiyuki Takizawa Profile

Dr. Yoshiyuki Takizawa

at RIKEN

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Publications (5)

Proceedings Article | 5 September 2019 Open Access

The Jem‐Euso mission and its challenging optics system

A. Zuccaro Marchi, Y. Takizawa, R. Young

Proceedings Volume 10565, 1056564 (2019) https://doi.org/10.1117/12.2552564

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The Extreme Universe Space Observatory (EUSO), onboard the Japanese Experiment Module (JEM) of the International Space Station (ISS), is a project led by Japan, with contributions from the United States, Italy, Germany, France, Spain, Switzerland, Russia, South Korea and Mexico. It is devoted to the detection of ultra high-energy cosmic particles with energies E>7x10¹⁹eV, which are revealed through emission in the atmosphere of Cherenkov and fluorescence light in the near-UV region. Current experiments are all ground-based. A big enhancement would rise from space, since a bigger atmospheric target could be monitored. However, since at these high energies the signal is faint and the probability of detection is very low (~1 Km^-2 century^-1), the optical system must have a large aperture, wide Field of View (FoV) and be necessarily lightweight. This project is the continuation of the EUSO mission, led by ESA, stopped some years ago at the end of phase A, and JEM-EUSO is currently at the end of phase A. For both experiments, a ~2.3 m Entrance Pupil (EP) diameter and a 60° FoV were required to achieve the science goals. However, for the present configuration, the constraint of the maximum stowable dimensions of the JAXA's H-II Transfer Vehicle (HTV) unpressurized cargo area forces the instrument to have maximum transverse dimensions of 2.65 x 1.9 m². Reflective optics, in the form of a properly designed Schmidt camera, are not yet suitable for this purpose, since these optical requirements would need a large, deployable, primary mirror. The main challenge for designing the current configuration consists in developing an unusual combination of large and lightweight refractive optics: two double-sided curved Fresnel lenses and a central curved Fresnel + diffractive lens, in UV-grade PMMA and/or CYTOP, have been considered. This paper describes the development of such a system, focusing on the possible choices of materials and overall optical design, which is responsibility of the authors. Performances of the latest configurations are also presented.

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Proceedings Article | 3 March 2003 Paper

Focal surface for the EUSO telescope

Hirohiko Shimizu, M. Ameri, F. Cadoux, Osvaldo Catalano, C. Chapron, S. Cuneo, Toshikazu Ebisuzaki, Flavio Fontanelli, Valerio Gracco, Philippe Gorodetzky, Yoshiya Kawasaki, P. Musico, Patric Nedelec, T. Patzak, M. Pallavicini, Alessandro Petrolini, E. Plagnol, F. Pratolongo, Mario Sannino, Naoto Sakaki, Yoshiyuki Takahashi, M. Takeda, Yoshiyuki Takizawa, Masahiro Teshima

Proceedings Volume 4858, (2003) https://doi.org/10.1117/12.458155

KEYWORDS: Space telescopes, Telescopes, Photomultipliers, Photons, Atmospheric Cherenkov telescopes, Magnetism, Sensors, Luminescence, Refractor telescopes, Space observatories

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Proceedings Article | 18 December 2002 Paper

Conceptual design of a combined visible-x-ray wideband telescope

Yoshiyuki Takizawa, Toshikazu Ebisuzaki, Chico Otani, Hirohiko Shimizu, Yoshiyuki Takahashi

Proceedings Volume 4849, (2002) https://doi.org/10.1117/12.460086

KEYWORDS: Photons, X-rays, Space telescopes, X-ray telescopes, Mirrors, Molybdenum, Silicon, Reflectivity, Telescopes, Visible radiation

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Proceedings Article | 8 November 2001 Paper

Development of a magnetic lens and prism for cold neutrons and their application to neutron scattering experiments

Takayuki Oku, Tomohiro Adachi, Hiromi Sato, Chico Otani, Yoshiyuki Takizawa, Kenji Sakai, Hirohiko Shimizu, Keita Sasaki, Hirokatsu Iwasa, Takashi Kamiyama, Yoshiaki Kiyanagi, Takashi Ino, Michihiro Furusaka, Junichi Suzuki, Masahiro Hino, Seiji Tasaki, Tohru Ebisawa

Proceedings Volume 4509, (2001) https://doi.org/10.1117/12.448064

KEYWORDS: Magnetism, Prisms, Scattering, Beam controllers, Laser scattering, Sensors, Signal attenuation, Beam shaping, Magnetic sensors, Prototyping

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Proceedings Article | 8 November 2001 Paper

Development of neuron compound lens and prism based on neutron refractive optics

Tomohiro Adachi, Takayuki Oku, Shin-ya Morita, Sei Moriyasu, Yutaka Yamagata, Hitoshi Ohmori, Yoshiyuki Takizawa, Hirohiko Shimizu, Tomoyuki Hirota, Yoshiaki Kiyanagi, Takashi Ino, Michihiro Furusaka, Junichi Suzuki

Proceedings Volume 4509, (2001) https://doi.org/10.1117/12.448065

KEYWORDS: Prisms, Sensors, Crystals, Numerical simulations, Fresnel lenses, Scattering, Neurons, Absorption, Mirrors, Analytical research

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