論文 - 山本 常夏
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A kinetics of the spinning gravitational field 査読あり
Tokonatsu Yamamoto
Publications of the Astronomical Society of Japan 73 ( 6 ) 1556 - 1562 2021年10月
出版者・発行元：Oxford University Press (OUP)
Abstract
According to the general theory of relativity, a spinning shell drags its gravitational field. Owing to this frame-dragging effect, the gravitational field rotates. The spinning field also drags particles in the field. Although this moment of force is negligibly small, its kinetics should be properly handled. In this study, we show that the spinning gravitational field generates a central force, which makes the spinning shells heavy. The observed galactic rotation is naturally described by this central force without dark matter. We describe the kinetics of the spinning field and central force.DOI： 10.1093/pasj/psab094
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Calibration and performance of the readout system based on switched capacitor arrays for the Large-Sized Telescope of the Cherenkov Telescope Array
CTA consortumu
Ground-based and Airborne Instrumentation for Astronomy VIII 2020年12月
DOI： 10.1117/12.2560018
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Design and production of segment mirrors for the large-sized telescopes of the Cherenkov Telescope Array
Tomohiro Inada, Satoshi Fukami, Koji Noda, Michiyuki Chikawa, Mika Kagaya, Hideaki Katagiri, Daniel Mazin, Koutaro Obara, Akira Okumura, Takayuki Saito, Masahiro Teshima, Tokonatsu Yamamoto, Tatsuo Yoshida, Ievgen Vovk
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV 2020年12月
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Calibration and performance of the readout system based on switched capacitor arrays for the Large-Sized Telescope of the Cherenkov Telescope Array
eiya Nozaki, Kyosuke Awai, Aya Bamba, Tokonatu Yamamoto 100 in all for the CTA-LST collaboration
2020年12月
DOI： 10.1117/12.2560018
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The readout system based on the ultra-fast waveform sampler DRS4 for the Large-Sized Telescope of the Cherenkov Telescope Array
S. Nozaki, O. Blanch, C. Delgado, P. Gliwny, D. Hadasch, Y. Inome, H. Katagiri, H. Kubo, Y. Kobayashi, D. Mazin, A. Moralejo, Y. Nogami, R. Paoletti, T. Saito, S. Sakurai, J. Sitarek, M. Takahashi, M. Teshima, T. Yamamoto
Journal of Physics: Conference Series 1468 ( 1 ) 2020年3月
出版者・発行元：Institute of Physics Publishing
The Cherenkov Telescope Array (CTA) is the next-generation ground-based very- high-energy gamma-ray observatory. By using three types of telescopes CTA can cover a wide energy range (20 GeV{300TeV) with an order of magnitude higher sensitivity than the current telescopes. The Large-Sized Telescope (LST) is designed to detect 20 GeV{1TeV gamma rays thanks to the large light collection area, sensitive photosensors, a fast trigger system, and readout electronics. The camera readout system must have a high signal-to-noise ratio and a linear signal sampling with a large dynamic range in order to efficiently detect dim and low- energy atmospheric showers. To meet this requirement we use the Domino Ring Sampler version 4 (DRS4), which also enables ultra-fast sampling with low power consumption. Some of the intrinsic characteristics of DRS4 chips require software corrections. These procedures lower the effect of non-Gaussian noise contribution and improve the timing resolution of the system. In this contribution we discuss the calibration algorithms and the resulting performance.
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CTA 報告 161：CTA大口径望遠鏡初号機とMAGIC望遠鏡の相互較正
大谷 恵生, 阿部 日向, 稲田 知大, 今川 要, 岩村 由樹, 大石 理子, 岡 知彦, 緒方 智之, 奥村 曉, 折戸 玲子, 梶原 侑貴, 片桐 秀明, 櫛田 淳子, 窪秀 利, 郡司 修一, 小林 志鳳, 斎藤 隆之, 榊直 人, 櫻井 駿介, 高橋 満里, 高橋 光成, 立石 大, 千川 道幸, 町支 勇貴, 手嶋 政廣, 中森 健之, 生天目 康之, 西嶋 恭司, 野上 優人, 野崎 誠也, 野村 亮介, 原田 善規, 深見 哲志, 藤原 千賀己, 古田 智也, 山本 常夏, 吉越 貴紀, 吉田 龍生, 他CTA-Japanコンソーシアム
日本物理学会講演概要集 75.1 441 - 441 2020年
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CTA報告160：CTA大口径望遠鏡初号機のモノ解析現状
野崎 誠也, 阿部 日向, 稲田 知大, 今川 要, 岩村 由樹, 大石 理子, 大谷 恵生, 岡 知彦, 緒方 智之, 奥村 曉, 折戸 玲子, 梶原 侑貴, 片桐 秀明, 櫛田 淳子, 窪 秀利, 郡司 修一, 小林 志鳳, 斎藤 隆之, 榊 直人, 櫻井 駿介, 高橋 満里, 高橋 光成, 立石 大, 千川 道幸, 町支 勇貴, 手嶋 政廣, 中森 健之, 生天目 目康之, 西嶋 恭司, 野上 優人, 野村 亮介, 原田 善規, 深見 哲志, 藤原 千賀己, 古田 智也, 山本 常夏, 吉越 貴紀, 吉田 龍生, 他CTA-Japanコンソーシアム
日本物理学会講演概要集 75.1 440 - 440 2020年
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CTA報告162：CTA大口径望遠鏡初号機のカメラ較正
小林 志鳳, 阿部 日向, 稲田 知大, 猪目 祐介, 今川 要, 岩村 由樹, 大石 理子, 大岡 秀行, 大谷 恵生, 岡 知彦, 岡崎 奈緒, 緒方 智之, 奥村 曉, 折戸 玲子, 梶原 侑貴, 片桐 秀明, 櫛田 淳子, 窪秀 利, 郡司 修一, 齋藤 隆之, 榊 直人, 櫻井 駿介, 鈴木 萌, 砂田 裕志, 高橋 満里, 高橋 光成, 立石 大, 田中 真伸, 田村 謙治, 千川 道幸, 町支 勇貴, 手嶋 政廣, 寺田 幸功, 門叶 冬樹, 中森 健之, 生天目 康之, 西嶋 恭司, 野上 優人, 野崎 誠也, 野田 浩司, 野村 亮介, 原田 善規, 深見 哲志, 藤原 千賀己, 古田 智也, 山本 常夏, 吉越 貴紀, 吉田 龍生, 他CTA-Japanコンソーシアム
日本物理学会講演概要集 75.1 471 - 471 2020年
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A 100-ps Pulse Laser as a Calibration Source
Yusuke Inome, Yuji Sunada, Yuuki Choushi, Masao Ichida, Razmik Mirzoyan, Hideyuki Ohoka, Takayuki Saito, Kenji Tamura, Masahiro Teshima, Tokonatsu Yamamoto
IEEE TNS, 66 ( 8 ) 1993 - 1997 2019年8月
共著
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Prospects for Cherenkov Telescope Array Observations of the Young Supernova Remnant RX J1718.7-3946
F. Aceror, T. Nakamori, T. Yamamoto et. al. (456 in all)
The Astrophysical Journa 840 ( 74 ) 1 - 14 2017年
共著
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Prototyping hexagonal light concentrators using high-reflectance specular films for the Large-Sized Telescopes of the Cherenkov Telescope Array
A. Okumura, T.V. Dang, S. Ono, S. Tanaka, M. Hayashida, J. Hinton, H. Katagiri, K. Noda, T. Yamamoto, T. Yoshida
JINST 12 ( P12008 ) 1 - 18 2017年
共著
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Simultaneous Observation of Solar Neutrons from the International Space Station and High Mountain Observatories in Association with a Flare on July 8, 2014
T. Muraki, D.Lopez, K.Koga, F.Kakimoto, T.Goka, L.X.Gonzalez, S.Masuda, Y.Matsubara, H.Matsumoto, P.Miranda, O.Okudaira, T.Obara, J.Salinas, T.Sako, S.Shibata, R.Ticona, Y.Tsunesada, J.F.Valdes-Galicia, K.Watanabe, T.Yamamoto
Solar Physics 291 1241 - 1265 2016年
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Development of the photomultiplier tube readout system for the first Large-Sized Telescope of the Cherenkov Telescope Array
S.Masuda, Y.Inome, T.Yamamoto for the LaST team for the CTA Consortium (31 in all)
Proc. of the 34th International Cosmic Ray Conference (2015) 2015年
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Evaluation of the basic propertied of the novel 1.5 in. size PMTs from Hamamatsu Photonics and Electron Tubes Enterprises
T. Toyama, Y. Hanabata, J. Hose, U. Menzel, R. Mirzoyan, D. Nakajima, M. Takahashi, M. Teshima, T. Yamamoto
Nuclear Instruments and Methods in Physics A 787 280 - 283 2015年
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Large scale distribution of ultra high energy cosmic rays detected at the Pierre Auger Observatory with zenith angles up to 80 degrees
The Pierre Auger Collaboration
The Astrophysical Journa 802 ( 111 ) 2015年
単著
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Search for isotropic microwave radiation from electron beam in the atmosphere
T. Yamamoto, I Ohota, Y. Inome, D. Ikeda, H. Sagawa, S. Ogio, T. Sako, T. Shibata, J.N. Mattherws
Proc. of the 34th International Cosmic Ray Conference (2015) 2015年
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Results of a Measurement of Solar Newtrons Emitted on March 5, 2012 using a Fiber-type neutron monitor onboard the SEDA-AP attanched to the ISS
K. Koga, H. Matsumoto, O.Okudaira, T.Goka, T.Obara, S.Masuda, Y.Muraki, S.Shibata, T.Yamamoto
Proc. of the 34th International Cosmic Ray Conference (2015) 2015年
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Novel 1.5' Size Exceptional PMTs for the CTA Project
R. Mirzoyan, D. Muller, T.Yoyama, D. Nakajima, U. Menzel, J. Hose, M. Takahashi, T. Yamamoto, M. Teshima
Proc. Of International Conference on New Photo-detectors PhotoDet 2015 Moscow, Troitsk, Russia (2015) 2015年
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Muons in air showers at the Pierre Auger Observatory: mean number in highly inclined events
The Pierre Auger Collaboration (672 in all)
Physical Review D 91 ( 32003 ) 2015年
単著
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Search for patterns by combining cosmic ray energy and arrival directions at the Pierre Auger Observatory
The Pierre Auger Collaboration
European physical Journal C 75 ( 269 ) 2015年
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