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pro vyhledávání: '"Imada, Hiroaki"'
We evaluate the effect of half-wave plate (HWP) imperfections inducing intensity leakage to the measurement of Cosmic Microwave Background (CMB) $B$-mode polarization signal with future satellite missions focusing on the tensor-to-scalar ratio $r$. T
Externí odkaz:
http://arxiv.org/abs/2308.00967
Autor:
Imada, Hiroaki, Nagai, Makoto
Publikováno v:
Optics Express Vol. 28, Issue 16, pp. 23075-23090 (2020)
The effect of aberrations on the aperture efficiency has not been discussed analytically, though aberrations determine the performance of a wide field-of-view system. Expansion of a wavefront error and a feed pattern into a series of the Zernike poly
Externí odkaz:
http://arxiv.org/abs/2003.05981
Antenna efficiency is one of the most important figures-of-merit of a radio telescope for observations especially at millimeter wavelengths or shorter wavelengths, even for a multibeam radio telescope. To analyze a system with a beam waveguide, a los
Externí odkaz:
http://arxiv.org/abs/2003.05544
Autor:
Komatsu, Kunimoto, Matsumura, Tomotake, Imada, Hiroaki, Ishino, Hirokazu, Katayama, Nobuhiko, Sakurai, Yuki
Publikováno v:
J. Astron. Telesc. Instrum. Syst. 5(4), 044008 (2019)
We report the development of the achromatic half-wave plate (AHWP) at millimeter wave for cosmic microwave background polarization experiments. We fabricate an AHWP consisting of nine a-cut sapphire plates based on the Pancharatnam recipe to cover a
Externí odkaz:
http://arxiv.org/abs/1905.13520
Autor:
Henrot-Versillé, Sophie, Couchot, Francois, Garrido, Xavier, Imada, Hiroaki, Louis, Thibaut, Tristram, Matthieu, Vanneste, Sylvain
Publikováno v:
A&A 623, A9 (2019)
In this paper, we study the estimation of the effective number of relativistic species from a combination of CMB and BAO data. We vary different ingredients of the analysis: the Planck high-$\ell$ likelihoods, the Boltzmann solvers, and the statistic
Externí odkaz:
http://arxiv.org/abs/1807.05003
Autor:
Kashima, Shingo, Hazumi, Masashi, Imada, Hiroaki, Katayama, Nobuhiko, Matsumura, Tomotake, Sekimoto, Yutaro, Sugai, Hajime
Publikováno v:
Applied Optics Vol. 57, Issue 15, pp. 4171-4179 (2018)
A side-fed crossed Dragone telescope provides a wide field-of-view. This type of a telescope is commonly employed in the measurement of cosmic microwave background (CMB) polarization, which requires an image-space telecentric telescope with a large f
Externí odkaz:
http://arxiv.org/abs/1712.05139
Autor:
Young, Karl, Wen, Qi, Hanany, Shaul, Imada, Hiroaki, Koch, Jürgen, Matsumura, Tomotake, Suttmann, Oliver, Schütz, Viktor
We used two novel approaches to produce sub-wavelength structure (SWS) anti-reflection coatings (ARC) on silicon for the millimeter and sub-millimeter (MSM) wave band: picosecond laser ablation and dicing with beveled saws. We produced pyramidal stru
Externí odkaz:
http://arxiv.org/abs/1702.01768
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Akademický článek
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Autor:
Ishii, Shun, Seta, Masumichi, Nagai, Makoto, Miyamoto, Yusuke, Nakai, Naomasa, Nagasaki, Taketo, Arai, Hitoshi, Imada, Hiroaki, Miyagawa, Naoki, Maezawa, Hiroyuki, Maehashi, Hideki, Bronfman, Leonardo, Finger, Ricardo
We have mapped the Orion-A Giant Molecular Cloud in the CO (J=4-3) line with the Tsukuba 30-cm submillimeter telescope.The map covered a 7.125 deg^2 area with a 9' resolution, including main components of the cloud such as Orion Nebula, OMC-2/3, and
Externí odkaz:
http://arxiv.org/abs/1511.01940