教員・研究者詳細 - 山本　常夏

論文 - 山本　常夏

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Coherent Radio Emission from the electron beam sudden appearance 査読あり

Krijn D. de Vries, Michael DuVernois, Masaki Fukushima, Romain Gaïor, Kael Hanson, Daisuke Ikeda, Yusuke Inome, Aya Ishihara, Takao Kuwabara, Keiichi Mase, John N. Matthews, Thomas Meures, Pavel Motloch, Izumi S. Ohta, Aongus O’Murchadha, Florian Partous, Matthew Relich, Hiroyuki Sagawa, Tatsunobu Shibata, Bokkyun Shin, Gordon Thomson, Shunsuke Ueyama, Nick van Eijndhoven, Tokonatsu Yamamoto, and Shigeru Yoshida

Physical Review D 98 ( 123020 ) 1 - 8 2018年3月

共著

DOI： 10.1103/PhysRevD.98.123020

A Technique for Estimating the Absolute Gain of a Photomultiplier Tube 査読あり

M.Takahashi, Y.Inome, S.Yoshii, A.Bamba, S.Gunji, D.Hadasch, M.Hayashida, H.Katagiri, Y.Konno, H.Kubo, J.Kushida, D.Nakajima, T.Nakamori, T.Nagayoshi, K.Nishijima, S.Nozaki, D.Mazin, S.Mashuda, T. Yamamoto, T.Yoshida

Nuclear Instruments and methods in physics research section A 894 ( 21 ) 1 - 7 2018年6月

単著

DOI： 10.1016/j.nima.2018.03.034

Measurement of microwave radiation from electron beam in the atmosphere 査読あり

I. S. Ohta, H. Akimune, M. Fukushima, D. Ikeda, Y. Inome, J.N. Matthews, S. Ogio, H. Sagawa, T. Sako, T. Shibata, T. Yamamoto

Nuclear Instruments and methods in physics research section A 810 44 - 50 2016年2月

共著

担当区分：筆頭著者

DOI： 10.1016/j.nima.2015.11.113

Propagation of Ultra-High-Energy Cosmic Ray Nuclei in Cosmic Magnetic Fields and Implications for Anisotropy Measurements 査読あり

Hajime Takami, Susumu Inoue, Tokonatsu Yamamoto

Astroparticle Physics 35 ( 12 ) 767 - 780 2012年7月

共著

Recent results from the Pierre Auger Observatory (PAO) indicate that the composition of ultra-high-energy cosmic rays (UHECRs) with energies above $10^{19}$ eV may be dominated by heavy nuclei. An important question is whether the distribution of arrival directions for such UHECR nuclei can exhibit observable anisotropy or positional correlations with their astrophysical source objects despite the expected strong deflections by intervening magnetic fields. For this purpose, we have simulated the propagation of UHECR nuclei including models for both the extragalactic magnetic field and the Galactic magnetic field. Assuming that only iron nuclei are injected steadily from sources with equal luminosity and spatially distributed according to the observed large scale structure in the local Universe, at the number of events published by the PAO so far, the arrival distribution of UHECRs would be consistent with no auto-correlation at 95% confidence if the mean number density of UHECR sources $n_s >~ 10^{-6}$ Mpc$^{-3}$, and consistent with no cross-correlation with sources within 95% errors for $n_s >~ 10^{-5}$ Mpc$^{-3}$. On the other hand, with 1000 events above $5.5 \times 10^{19}$ eV in the whole sky, next generation experiments can reveal auto-correlation with more than 99% probability even for $n_s <~ 10^{-3}$ Mpc$^{-3}$, and cross-correlation with sources with more than 99% probability for $n_s <~ 10^{-4}$ Mpc$^{-3}$. In addition, we find that the contribution of Centaurus A is required to reproduce the currently observed UHECR excess in the Centaurus region. Secondary protons generated by photodisintegration of primary heavy nuclei during propagation play a crucial role in all cases, and the resulting anisotropy at small angular scales should provide a strong hint of the source location if the maximum energies of the heavy nuclei are sufficiently high.

その他リンク： http://xxx.yukawa.kyoto-u.ac.jp/PS_cache/arxiv/pdf/1202/1202.2874v1.pdf

Prototyping hexagonal light concentrators using high-reflectance specular films for the Large-Sized Telescopes of the Cherenkov Telescope Array 査読あり

A. Okumura, T.V. Dang, S. Ono, S. Tanaka, M. Hayashida, J. Hinton, H. Katagiri, K. Noda, T. Yamamoto, T. Yoshida

Journal of Instrujmentation 12 ( P12008 ) 1 - 18 2017年11月

共著

DOI： 10.1088/1748-0221/12/12/P12008

Prospects for Cherenkov Telescope Array Observations of the Young Supernova Remnant RX J1718.7-3946 査読あり

F. Aceror, T. Nakamori, T. Yamamoto et. al. (456 in all)

Astrophysical Journal 840 ( 74 ) 1 - 14 2017年3月

共著

DOI： 10.3847/1538-4357/aa6d67

Evaluation of novel PMTs of worldwide best parameters for the CTA project 査読あり

R. Mirzoyan, D. Muller, J. Hose, U. Menzel, D. Nakajima, M. Takahashi, M. Teshima, T. Toyama, T. Yamamoto

Nuclear Instruments and methods in physics research section A 845 603 - 606 2017年2月

共著

DOI： 10.1016/j.nima.2016.06.080

Evaluation of Photo Multiplier Tube candidates for the Cherenkov Telescope Array 査読あり

T. Toyama, Y. Hanabata, J. Hose, U. Menzel, R. Mirzoyan, D. Nakajima, M. Takahashi, M. Teshima, T. Yamamoto

Nuclear Instruments and methods in physics research section A 787 280 - 283 2015年8月

共著

DOI： 10.1016/j.nima.2015.08.030

Development and quality control of PMT modules for the large-sized telescopes of the Cherenkov Telescope Array Observatory 査読あり国際共著

T. Saito, M. Takahashi, Y. Inome, H. Abe, M. Artero, O. Blanch, J. Becerra González, S. Fukami, D. Hadasch, Y. Hanabata, Y. Hattori, J. Herrera Llorente, K. Ishio, H. Iwasaki, H. Katagiri, K. Kawamura, D. Kerszberg, S. Kimura, T. Kiyomoto, T. Kojima, Y. Konno, Y. Kobayashi, S. Koyama, H. Kubo, J. Kushida, A. López-Oramas, S. Masuda, S. Matsuoka, D. Mazin, D. Nakajima, T. Nakamori, T. Nagayoshi, D. Ninci, K. Nishijima, G. Nishiyama, Y. Nogami, S. Nozaki, M. Ogino, H. Ohoka, T. Oka, S. Ono, A. Okumura, R. Orito, A. Rugliancich, S. Sakurai, N. Sasaki, Y. Sunada, M. Suzuki, K. Tamura, J. Takeda, Y. Terada, M. Teshima, F. Tokanai, Y. Tomono, S. Tsujimoto, Y. Tsukamoto, Y. Umetsu, T. Yamamoto, T. Yoshida

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 1073 2025年4月

共著

The camera of the Large-Sized Telescopes (LSTs) of the Cherenkov Telescope Array Observatory (CTAO) consists of 1855 pixels that are grouped into 265 high-performance photomultiplier tube (PMT) modules. Each module comprises a seven-light-guide plate, seven PMT units, a slow control board, and a readout board with a trigger board. The requirements for the PMT modules include various aspects, such as photon detection efficiency, dynamic range, buffer depth, and test pulse functionality. We have developed a high-performance PMT module that fulfills all these requirements. Mass-production and quality control (QC) of modules for all four LSTs of the northern CTAO have been completed. Here we report on the technical details of each element of the module and its performance, together with the methods and results of QC measurements.

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論文 - 山本 常夏

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論文 - 山本　常夏