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Magnetic Configuration Effects on Fast Ion Losses Induced by Fast Ion Driven Toroidal Alfvén Eigenmodes in the Large Helical Device

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Plasma Science and Technology 2012年第4期14卷 269-272页

作者： k.ogawa M.ISOBE k.TOI F.WATANABE D.A.SPONG A.SHIMIZU M.OSAkABE D.S.DARROW S.OHDACHI S.SAkAkIBARA LHD Experiment Group Department of Energy Science and Engineering Nagoya University National Institute for Fusion Science Graduate School of Energy Science Kyoto University Oak Ridge National Laboratory Oak Ridge Princeton Plasma Physics Laboratory Princeton University

Beam-ion losses induced by fast-ion-driven toroidal Alfven eigenmodes （TAE） were measured with a scintillator-based lost fast-ion probe （SLIP） in the large helical device （LHD）. The SLIP gave simultaneously the energy E and the pitch angle X=arccos（v///v） distribution of the lost fast ions. The loss fluxes were investigated for three typical magnetic configurations of Rax-vac=3.60 m, 3.75 m. and 3.90 m, where Rax-vac is the magnetic axis position of the vacuum field. Dominant losses induced by TAEs in these three configurations were observed in the E/X regions of 50-190 keV/40°, 40-170 keV/25°, and 30-190 keV/30°, respectively. Lost-ion fluxes induced by TAEs depend clearly on the amplitude of TAE magnetic fluctuations, Rax-vac and the toroidal field strength Bt. The increment of the loss fluxes has the dependence of （bTAE/Bt）s. The power s increases from s = 1 to 3 with the increase of the magnetic axis position in finite beta plasmas.

关键词： toroidal Alfven eigenmode fast ion loss the large helical device

Contribution of the Large Helical Device Plasmas to Alfvén Eigenmode Physics in Toroidal Plasmas

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Plasma Science and Technology 2009年第4期11卷 377-380页

作者： k. TOI M. ISOBE M. OSAkABE F. WATANABE k. ogawa T. TOkUZAWA A. SHIMIZU T. IDO k. IDA, T. ITO S. MORITA k. NAGAOkA k. NARIHARA M. NISHIURA S. OHDACHI S. SAkAkIBARA k. TANAkA LHD Experiment Group National Institute for Fusion Science Toki 509-5292 Japan Department of Energy Engineering and Science Nagoya University Nagoya 464-8601 Japan

In the large helical device （LHD） having three dimensional configuration, Alfven eigenmodes （AEs） destabilized by energetic ions are widely investigated using neutral beam heated plasmas with monotonic and non-monotonic rotational transform （l/2π） profiles. In a plasma with monotonic l/2π-profile, core-localized toroidicity-induced Alfven eigenmode （TAE） as well as global one are often observed. With the increase in the averaged toroidal beta value, defined as the ratio of total plasma pressure to toroidal magnetic pressure, core-localized TAE with low toroidal mode number becomes global. In a relatively high beta plasma with monotonic l/2π-profile, two TAEs with different toroidal mode number often interact nonlinearly and generate another modes through three wave coupling. In a plasma with non-monotonic l/2π-profile generated by intense counter neutral beam current drive, reversed shear Alfven eigenmode （RSAE） and geodesic acoustic mode （CAM） excited by energetic ions were observed for the first time in a helical plasma. Nonlinear coupling was also observed between RSAE and GAM.

关键词： alpha particles Alfven eigenmodes geodesic acoustic mode helical/stellarator

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Preface

Preface

Stabilization of a high-order harmonic generation seeded extreme ultraviolet free electron laser by time-synchronization control with electro-optic sampling

The Fourth Chinese-Japanese Electron Microscopy Seminar

作者： k.Lee H.Hashimoto k.ogawa Chinese coordinator Japanese coordinator Japanese coordinator

＜正＞The fourth Chinese-Japanese Seminar on Electron Microscopy in Atom Resolution,Materials Science and Biology was held in kunming,Yunnan Province,China,from November 8th to 12th,1987.22 Japanese and 40 Chinese electron microscopists participated along with 40 Chinese ob- *** full proceedings of this seminar are included in this volume

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High Power Laser Science and Engineering 2015年第2期3卷 1-10页

作者： H.Tomizawa T.Sato k.ogawa k.Togawa T.Tanaka T.Hara M.Yabashi H.Tanaka T.Ishikawa T.Togashi S.Matsubara Y.Okayasu T.Watanabe E.J.Takahashi k.Midorikawa M.Aoyama k.Yamakawa S.Owada A.Iwasaki k.Yamanouchi RIkEN SPring-8 Center Japan Synchrotron Radiation Research Institute RIkEN Center for Advanced Photonics Japan Atomic Energy Agency The University of Tokyo

A fully coherent free electron laser(FEL) seeded with a higher-order harmonic(HH) pulse from high-order harmonic generation(HHG) is successfully operated for a sufficiently prolonged time in pilot user experiments by using a timing drift feedback. For HHG-seeded FELs, the seeding laser pulses have to be synchronized with electron bunches. Despite seeded FELs being non-chaotic light sources in principle, external laser-seeded FELs are often unstable in practice because of a timing jitter and a drift between the seeding laser pulses and the accelerated electron bunches. Accordingly,we constructed a relative arrival-timing monitor based on non-invasive electro-optic sampling(EOS). The EOS monitor made uninterrupted shot-to-shot monitoring possible even during the seeded FEL operation. The EOS system was then used for arrival-timing feedback with an adjustability of 100 fs for continual operation of the HHG-seeded FEL. Using the EOS-based beam drift controlling system, the HHG-seeded FEL was operated over half a day with an effective hit rate of 20%–30%. The output pulse energy was 20 μJ at the 61.2 nm wavelength. Towards seeded FELs in the water window region, we investigated our upgrade plan to seed high-power FELs with HH photon energy of 30–100 e V and lase at shorter wavelengths of up to 2 nm through high-gain harmonic generation(HGHG) at the energy-upgraded SPring-8Compact SASE Source(SCSS) accelerator. We studied a benefit as well as the feasibility of the next HHG-seeded FEL machine with single-stage HGHG with tunability of a lasing wavelength.

关键词： arrival-timing monitor electro-optic sampling(EOS)

Ni和N对高Cr高Mo双相不锈钢焊接接头机械性能及腐蚀性能的影响

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国外金属加工 1994年第3期15卷 9-13页

作者： ogawa,k 邹贵生

Motion reconstruction of the small carry-on impactor aboard Hayabusa2

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Astrodynamics 2020年第4期4卷 289-308页

作者： Takanao Saiki Yuya Mimasu Yuto Takei Manabu Yamada Hirotaka Sawada k azunori ogawa Naoko ogawa Hiroshi Takeuchi Akira Miura Yuri Shimaki koji Wada Rie Honda Yasuhiro Yokota kei Shirai Naruhisa Sano Hirohito Ohtsuka Go Ono kent Yoshikawa Shota kikuchi Chikako Hirose Yukio Yamamoto Takahiro Iwata Masahiko Arakawa Seiji Sugita Satoshi Tanaka Fuyuto Terui Makoto Yoshikawa Satoru Nakazawa Sei-ichiro Watanabe Yuichi Tsuda Japan Aerospace Exploration Agency Sagamihara 252-5210Japan Chiba Institute of Technology Narashino 275-0016Japan kobe University K obe 657-8501Japan The Graduate University for Aduanced Studies Sagamihara 252-5210Japan kochi University Kochi 780-8520Japan IHI Aerospace Co. LtdTomioka 370-2398Japan The University of Tokyo Tokyo 113-0033Japan Nagoya University Nagoya 464-8601Japan

Subsurface exploration is one of the most ambitious scientific objectives of the Hayabusa2 mission.A small device called small carry-on impactor(SCI)was developed to create an artificial crater on the surface of asteroid *** enables us to sample subsurface materials,which will provide a window to the *** physical properties of the resulting crater are also useful for understanding the internal structure of *** understanding of the crater and ejecta properties,including the depth of excavation of subsurface materials,requires accurate information on impact *** particular,the impact angle is a critical factor because it greatly influences the size and shape of the *** April 5,2019,the Hayabusa2 spacecraft deployed the SCI at 500 m of altitude above the asteroid *** SCI gradually reduced its altitude,and it shot a 2 kg copper projectile into the asteroid 40 min after *** the position of the released SCI is essential for determining the impact *** study describes the motion reconstruction of the SCI based on the actual operation *** results indicate that the SCI was released with high accuracy.

关键词： small body exploration Hayabusa2 kinetic impact artificial crater motion reconstruction

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移动通信服务的现状及未来

新兴科技 1989年第2期 28-31页

作者： ogawa,k 聂枫

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《日本慢性耳鸣诊治临床实践指南》摘译

听力学及言语疾病杂志 2021年第1期29卷 114-116页

作者：夏红艳(摘译) 赵立东(摘译) 王秋菊(审校) ogawa k Sato H Takahashi M 解放军总医院耳鼻咽喉头颈外科解放军耳鼻咽喉科研究所北京100853 浙江中医药大学杭州310000 不详

人群中耳鸣的患病率为10%~15%,其中存在临床问题的占20%。在日本,出现耳鸣并深感痛苦的患者大约有300万,一些难治性耳鸣的治疗效果不尽如人意。本指南适用于慢性耳鸣患者,旨在规范耳鸣的循证诊断和治疗,提高耳鸣患者的生活质量。近年来... 详细信息

人群中耳鸣的患病率为10%~15%,其中存在临床问题的占20%。在日本,出现耳鸣并深感痛苦的患者大约有300万,一些难治性耳鸣的治疗效果不尽如人意。本指南适用于慢性耳鸣患者,旨在规范耳鸣的循证诊断和治疗,提高耳鸣患者的生活质量。近年来发现,认知行为疗法和声治疗是减少耳鸣患者痛苦的有效方法。在日本医疗机构的医生都有权决定是否进行不同的治疗,并且还确定了治疗耳鸣的设施区域之间的差异。做到耳鸣评价标准化,以及为慢性耳鸣制定循证治疗指南。耳鸣临床实践指南的循证标准化是提高日本耳鸣医学检查水平的重要课题,该指南由小组委员会成员制定,由日本听力学会编辑,并由日本耳鼻喉科学会授权。

关键词：临床实践指南认知行为疗法循证治疗医学检查医疗机构耳鼻喉科耳鸣患病率

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烧煤分解炉的改造

建材发展导向 1983年第4期 40-46页

作者： Z.kawai,T.Ichyanagi,k.Sekine,k.Suto,k.ogawa,杨春华日日日日日

秩父水泥有限公司建于1923年,用附近Buko山质量高的石灰石生产水泥.现在公司在秩父开了一厂、二厂,在kumagaya开了三厂.这三个厂年产水泥约七百万吨,全部用干法窑生产.第二次石油危机以后石油价格的猛涨,促使公司于1979年春季决定研究... 详细信息

秩父水泥有限公司建于1923年,用附近Buko山质量高的石灰石生产水泥.现在公司在秩父开了一厂、二厂,在kumagaya开了三厂.这三个厂年产水泥约七百万吨,全部用干法窑生产.第二次石油危机以后石油价格的猛涨,促使公司于1979年春季决定研究由烧油改为烧煤,到1980年秋五台窑都改为烧煤了.改造在三个厂同时进行.工程包括磨煤

关键词：分解炉反应室预热器旋风筒烧油熟料质量生料系统